Class WindowMessages

Represents a class that provides the list of window messages that are used in window process callback function.

Inheritance
System.Object
WindowMessages
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Syncfusion.WinForms.Core
Assembly: Syncfusion.Shared.Base.dll
Syntax
public static class WindowMessages

Fields

ABE_BOTTOM

Bottom edge.

Declaration
public const int ABE_BOTTOM = 3
Field Value
Type
System.Int32

ABE_LEFT

Left edge.

Declaration
public const int ABE_LEFT = 0
Field Value
Type
System.Int32

ABE_RIGHT

Right edge.

Declaration
public const int ABE_RIGHT = 2
Field Value
Type
System.Int32

ABE_TOP

Top edge.

Declaration
public const int ABE_TOP = 1
Field Value
Type
System.Int32

ABM_GETTASKBARPOS

Retrieves the bounding rectangle of the Windows task bar.

Declaration
public const int ABM_GETTASKBARPOS = 5
Field Value
Type
System.Int32

BFFM_ENABLEOK

This message enables or disables the OK button for the Browse For Folder dialog box.

Declaration
public const int BFFM_ENABLEOK = 1125
Field Value
Type
System.Int32

BFFM_INITIALIZED

The dialog box has finished initializing.

Declaration
public const int BFFM_INITIALIZED = 1
Field Value
Type
System.Int32

BFFM_IUNKNOWN

An IUnknown interface is available to the dialog box.

Declaration
public const int BFFM_IUNKNOWN = 5
Field Value
Type
System.Int32

BFFM_SELCHANGED

This message indicates that the selection in the dialog box changed.

Declaration
public const int BFFM_SELCHANGED = 2
Field Value
Type
System.Int32

BFFM_SETEXPANDED

Specifies the path of a folder to expand in the Browse dialog box. The path can be specified as a Unicode string or a PIDL.

Declaration
public const int BFFM_SETEXPANDED = 1130
Field Value
Type
System.Int32

BFFM_SETOKTEXT

Sets the text that is displayed on the dialog box's OK button.

Declaration
public const int BFFM_SETOKTEXT = 1129
Field Value
Type
System.Int32

BFFM_SETSELECTION

This message indicates that the selection in the dialog box changed.

Declaration
public const int BFFM_SETSELECTION = 1127
Field Value
Type
System.Int32

BFFM_SETSTATUSTEXTW

This message sets the status text in the Browse For Folder dialog box.

Declaration
public const int BFFM_SETSTATUSTEXTW = 1128
Field Value
Type
System.Int32

BFFM_VALIDATEFAILEDW

The user typed an invalid name into the dialog's edit box. A nonexistent folder is considered an invalid name.

Declaration
public const int BFFM_VALIDATEFAILEDW = 4
Field Value
Type
System.Int32

BITSPIXEL

Represents the bits per pixel.

Declaration
public const int BITSPIXEL = 12
Field Value
Type
System.Int32

CS_DROPSHADOW

Enables the drop shadow effect on a window.

Declaration
public const int CS_DROPSHADOW = 131072
Field Value
Type
System.Int32

DCX_CACHE

Returns a DC from the cache, rather than the OWNDC or CLASSDC window. Essentially overrides CS_OWNDC and CS_CLASSDC.

Declaration
public const int DCX_CACHE = 2
Field Value
Type
System.Int32

DCX_CLIPCHILDREN

Excludes the visible regions of all child windows below the window identified by hWnd.

Declaration
public const int DCX_CLIPCHILDREN = 8
Field Value
Type
System.Int32

DCX_CLIPSIBLINGS

Excludes the visible regions of all sibling windows above the window identified by hWnd.

Declaration
public const int DCX_CLIPSIBLINGS = 16
Field Value
Type
System.Int32

DCX_EXCLUDERGN

The clipping region identified by hrgnClip is excluded from the visible region of the returned DC.

Declaration
public const int DCX_EXCLUDERGN = 64
Field Value
Type
System.Int32

DCX_INTERSECTRGN

The clipping region identified by hrgnClip is intersected with the visible region of the returned DC.

Declaration
public const int DCX_INTERSECTRGN = 128
Field Value
Type
System.Int32

DCX_LOCKWINDOWUPDATE

Allows drawing even if there is a LockWindowUpdate call in effect that would otherwise exclude this window. Used for drawing during tracking.

Declaration
public const int DCX_LOCKWINDOWUPDATE = 1024
Field Value
Type
System.Int32

DCX_PARENTCLIP

Uses the visible region of the parent window. The parent's WS_CLIPCHILDREN and CS_PARENTDC style bits are ignored. The origin is set to the upper-left corner of the window identified by hWnd.

Declaration
public const int DCX_PARENTCLIP = 32
Field Value
Type
System.Int32

DCX_WINDOW

Returns a DC that corresponds to the window rectangle rather than the client rectangle.

Declaration
public const int DCX_WINDOW = 1
Field Value
Type
System.Int32

DT_BOTTOM

Justifies the text to the bottom of the rectangle. This value is used only with the DT_SINGLELINE value.

Declaration
public const int DT_BOTTOM = 8
Field Value
Type
System.Int32

DT_CALCRECT

Determines the width and height of the rectangle. If there are multiple lines of text, DrawText uses the width of the rectangle pointed to by the lpRect parameter and extends the base of the rectangle to bound the last line of text. If the largest word is wider than the rectangle, the width is expanded. If the text is less than the width of the rectangle, the width is reduced. If there is only one line of text, DrawText modifies the right side of the rectangle so that it bounds the last character in the line. In either case, DrawText returns the height of the formatted text but does not draw the text.

Declaration
public const int DT_CALCRECT = 1024
Field Value
Type
System.Int32

DT_CENTER

Centers text horizontally in the rectangle.

Declaration
public const int DT_CENTER = 1
Field Value
Type
System.Int32

DT_EDITCONTROL

Duplicates the text-displaying characteristics of a multi line edit control. Specifically, the average character width is calculated in the same manner as for an edit control, and the function does not display a partially visible last line.

Declaration
public const int DT_EDITCONTROL = 8192
Field Value
Type
System.Int32

DT_END_ELLIPSIS

For displayed text, if the end of a string does not fit in the rectangle, it is truncated and ellipses are added. If a word that is not at the end of the string goes beyond the limits of the rectangle, it is truncated without ellipses.

Declaration
public const int DT_END_ELLIPSIS = 32768
Field Value
Type
System.Int32

DT_EXPANDTABS

Expands tab characters. The default number of characters per tab is eight. The DT_WORD_ELLIPSIS, DT_PATH_ELLIPSIS, and DT_END_ELLIPSIS values cannot be used with the DT_EXPANDTABS value.

Declaration
public const int DT_EXPANDTABS = 64
Field Value
Type
System.Int32

DT_EXTERNALLEADING

Includes the font external leading in line height. Normally, external leading is not included in the height of a line of text.

Declaration
public const int DT_EXTERNALLEADING = 512
Field Value
Type
System.Int32

DT_HIDEPREFIX

Ignores the ampersand prefix character in the text. The letter that follows will not be underlined, but other mnemonic-prefix characters are still processed.

Declaration
public const int DT_HIDEPREFIX = 1048576
Field Value
Type
System.Int32

DT_INTERNAL

Uses the system font to calculate text metrics.

Declaration
public const int DT_INTERNAL = 4096
Field Value
Type
System.Int32

DT_LEFT

Aligns text to the left.

Declaration
public const int DT_LEFT = 0
Field Value
Type
System.Int32

DT_MODIFYSTRING

Modifies the specified string to match the displayed text. This value has no effect unless DT_END_ELLIPSIS or DT_PATH_ELLIPSIS is specified.

Declaration
public const int DT_MODIFYSTRING = 65536
Field Value
Type
System.Int32

DT_NOCLIP

Draws without clipping. DrawText is somewhat faster when DT_NOCLIP is used.

Declaration
public const int DT_NOCLIP = 256
Field Value
Type
System.Int32

DT_NOFULLWIDTHCHARBREAK

Prevents a line break at a DBCS (double-wide character string), so that the line breaking rule is equivalent to SBCS strings. For example, this can be used in Korean windows, for more readability of icon labels. This value has no effect unless DT_WORDBREAK is specified.

Declaration
public const int DT_NOFULLWIDTHCHARBREAK = 524288
Field Value
Type
System.Int32

DT_NOPREFIX

Turns off processing of prefix characters. Normally, DrawText interprets the mnemonic-prefix character as a directive to underscore the character that follows, and the mnemonic-prefix characters as a directive to print a single. By specifying DT_NOPREFIX, this processing is turned off.

Declaration
public const int DT_NOPREFIX = 2048
Field Value
Type
System.Int32

DT_PATH_ELLIPSIS

For displayed text, replaces characters in the middle of the string with ellipses so that the result fits in the specified rectangle. If the string contains backslash () characters, DT_PATH_ELLIPSIS preserves as much as possible of the text after the last backslash.

Declaration
public const int DT_PATH_ELLIPSIS = 16384
Field Value
Type
System.Int32

DT_PREFIXONLY

Draws only an underline at the position of the character following the ampersand prefix character. Does not draw any other characters in the string.

Declaration
public const int DT_PREFIXONLY = 2097152
Field Value
Type
System.Int32

DT_RIGHT

Aligns text to the right.

Declaration
public const int DT_RIGHT = 2
Field Value
Type
System.Int32

DT_RTLREADING

Layout in right-to-left reading order for bidirectional text when the font selected into the hdc is a Hebrew or Arabic font. The default reading order for all text is left-to-right.

Declaration
public const int DT_RTLREADING = 131072
Field Value
Type
System.Int32

DT_SINGLELINE

Displays text on a single line only. Carriage returns and line feeds do not break the line.

Declaration
public const int DT_SINGLELINE = 32
Field Value
Type
System.Int32

DT_TABSTOP

Sets tab stops. Bits 15-8 (high-order byte of the low-order word) of the uFormat parameter specify the number of characters for each tab. The default number of characters per tab is eight. The DT_CALCRECT, DT_EXTERNALLEADING, DT_INTERNAL, DT_NOCLIP, and DT_NOPREFIX values cannot be used with the DT_TABSTOP value.

Declaration
public const int DT_TABSTOP = 128
Field Value
Type
System.Int32

DT_TOP

Justifies the text to the top of the rectangle

Declaration
public const int DT_TOP = 0
Field Value
Type
System.Int32

DT_VCENTER

Centers text vertically. This value is used only with the DT_SINGLELINE value.

Declaration
public const int DT_VCENTER = 4
Field Value
Type
System.Int32

DT_WORD_ELLIPSIS

Truncates any word that does not fit in the rectangle and adds ellipses.

Declaration
public const int DT_WORD_ELLIPSIS = 262144
Field Value
Type
System.Int32

DT_WORDBREAK

Breaks words. Lines are automatically broken between words if a word would extend past the edge of the rectangle specified by the rectangle parameter. A carriage return-line feed sequence also breaks the line. If this is not specified, output is on one line.

Declaration
public const int DT_WORDBREAK = 16
Field Value
Type
System.Int32

DVASPECT_CONTENT

Provides a representation of an object so it can be displayed as an embedded object inside of a container. This value is typically specified for compound document objects. The presentation can be provided for the screen or printer.

Declaration
public const int DVASPECT_CONTENT = 1
Field Value
Type
System.Int32

DVASPECT_OPAQUE

Represents the opaque, easy to clip parts of an object. Objects may or may not support this aspect.

Declaration
public const int DVASPECT_OPAQUE = 16
Field Value
Type
System.Int32

DVASPECT_TRANSPARENT

Represents the transparent or irregular parts of on object, typically parts that are expensive or impossible to clip out. Objects may or may not support this aspect.

Declaration
public const int DVASPECT_TRANSPARENT = 32
Field Value
Type
System.Int32

EM_CHARFROMPOS

Gets information about the character closest to a specified point in the client area of an edit control.

Declaration
public const int EM_CHARFROMPOS = 215
Field Value
Type
System.Int32

EM_GETRECT

Gets the formatting rectangle of an edit control.

Declaration
public const int EM_GETRECT = 178
Field Value
Type
System.Int32

ESB_DISABLE_DOWN

Disables the bottom arrow on a vertical scroll bar.

Declaration
public const int ESB_DISABLE_DOWN = 2
Field Value
Type
System.Int32

ESB_DISABLE_LEFT

Disables the left arrow on a horizontal scroll bar.

Declaration
public const int ESB_DISABLE_LEFT = 1
Field Value
Type
System.Int32

ESB_DISABLE_RIGHT

Disables the right arrow on a horizontal scroll bar.

Declaration
public const int ESB_DISABLE_RIGHT = 2
Field Value
Type
System.Int32

ESB_DISABLE_UP

Disables the top arrow on a vertical scroll bar.

Declaration
public const int ESB_DISABLE_UP = 1
Field Value
Type
System.Int32

GC_ALLGESTURES

Indicates all the gestures.

Declaration
public const int GC_ALLGESTURES = 1
Field Value
Type
System.Int32

GcPan

Indicates all pan gesture.

Declaration
public const int GcPan = 31
Field Value
Type
System.Int32

GcPanWithGutter

Limits perpendicular movement to primary direction until a threshold is reached to break out of the gutter.

Declaration
public const int GcPanWithGutter = 8
Field Value
Type
System.Int32

GcPanWithIntertia

Indicates panning with inertia to smoothly slow when pan gestures stop.

Declaration
public const int GcPanWithIntertia = 16
Field Value
Type
System.Int32

GcPanWithSingleFingerHorizontally

Indicates the horizontal panning with single finger.

Declaration
public const int GcPanWithSingleFingerHorizontally = 4
Field Value
Type
System.Int32

GcPanWithSingleFingerVertically

Indicates the vertical panning with single finger.

Declaration
public const int GcPanWithSingleFingerVertically = 2
Field Value
Type
System.Int32

GfBegin

A gesture is starting.

Declaration
public const int GfBegin = 1
Field Value
Type
System.Int32

GfEnd

A gesture is finished.

Declaration
public const int GfEnd = 4
Field Value
Type
System.Int32

GfInertia

Set the gesture is triggered inertia.

Declaration
public const int GfInertia = 2
Field Value
Type
System.Int32

GID_BEGIN

Indicates generic gesture is begin.

Declaration
public const int GID_BEGIN = 1
Field Value
Type
System.Int32

GID_END

Indicates generic gesture is end.

Declaration
public const int GID_END = 2
Field Value
Type
System.Int32

GID_PAN

Indicates pan move or pan start.

Declaration
public const int GID_PAN = 4
Field Value
Type
System.Int32

GID_PRESSANDTAP

Indicates the press and tap gesture.

Declaration
public const int GID_PRESSANDTAP = 7
Field Value
Type
System.Int32

GID_ROTATE

Indicates rotate move or rotate start.

Declaration
public const int GID_ROTATE = 5
Field Value
Type
System.Int32

GID_TWOFINGERTAP

Indicates the two finger tap gesture.

Declaration
public const int GID_TWOFINGERTAP = 6
Field Value
Type
System.Int32

GID_ZOOM

Indicates zoom start, zoom move, or zoom stop. The first GID_ZOOM command message begins a zoom but does not cause any zooming. The second GID_ZOOM command triggers a zoom relative to the state contained in the first GID_ZOOM.

Declaration
public const int GID_ZOOM = 3
Field Value
Type
System.Int32

GW_CHILD

The retrieved handle identifies the child window at the top of the Z order, if the specified window is a parent window; otherwise, the retrieved handle is NULL. The function examines only child windows of the specified window. It does not examine descendant windows.

Declaration
public const int GW_CHILD = 5
Field Value
Type
System.Int32

GW_ENABLEDPOPUP

The retrieved handle identifies the enabled popup window owned by the specified window (the search uses the first such window found using GW_HWNDNEXT); otherwise, if there are no enabled popup windows, the retrieved handle is that of the specified window.

Declaration
public const int GW_ENABLEDPOPUP = 6
Field Value
Type
System.Int32

GW_HWNDFIRST

The retrieved handle identifies the window of the same type that is highest in the Z order.

Declaration
public const int GW_HWNDFIRST = 0
Field Value
Type
System.Int32

GW_HWNDLAST

The retrieved handle identifies the window of the same type that is lowest in the Z order.

Declaration
public const int GW_HWNDLAST = 1
Field Value
Type
System.Int32

GW_HWNDNEXT

The retrieved handle identifies the window below the specified window in the Z order.

Declaration
public const int GW_HWNDNEXT = 2
Field Value
Type
System.Int32

GW_HWNDPREV

The retrieved handle identifies the window above the specified window in the Z order.

Declaration
public const int GW_HWNDPREV = 3
Field Value
Type
System.Int32

GW_OWNER

The retrieved handle identifies the specified window's owner window, if any. For more information, see Owned Windows.

Declaration
public const int GW_OWNER = 4
Field Value
Type
System.Int32

GWL_EXSTYLE

Sets a new extended window style.

Declaration
public const int GWL_EXSTYLE = -20
Field Value
Type
System.Int32

GWL_HWNDPARENT

Index to change the parent of a child window.

Declaration
public const int GWL_HWNDPARENT = -8
Field Value
Type
System.Int32

GWL_ID

Sets a new identifier of the child window. The window cannot be a top-level window.

Declaration
public const int GWL_ID = -12
Field Value
Type
System.Int32

GWL_STYLE

Sets a new window style.

Declaration
public const int GWL_STYLE = -16
Field Value
Type
System.Int32

GWL_WNDPROC

Sets a new address for the window procedure. You cannot change this attribute if the window does not belong to the same process as the calling thread.

Declaration
public const int GWL_WNDPROC = -4
Field Value
Type
System.Int32

HTBORDER

In the border of a window that does not have a sizing border.

Declaration
public const int HTBORDER = 18
Field Value
Type
System.Int32

HTBOTTOM

In the lower corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTBOTTOM = 15
Field Value
Type
System.Int32

HTBOTTOMLEFT

In the lower-left corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTBOTTOMLEFT = 16
Field Value
Type
System.Int32

HTBOTTOMRIGHT

In the lower-right corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTBOTTOMRIGHT = 17
Field Value
Type
System.Int32

HTCAPTION

In a title bar.

Declaration
public const int HTCAPTION = 2
Field Value
Type
System.Int32

HTCLIENT

In a client area.

Declaration
public const int HTCLIENT = 1
Field Value
Type
System.Int32

HTCLOSE

In a Close button.

Declaration
public const int HTCLOSE = 20
Field Value
Type
System.Int32

HTERROR

On the screen background or on a dividing line between windows (same as HTNOWHERE, except that the DefWindowProc function produces a system beep to indicate an error).

Declaration
public const int HTERROR = -2
Field Value
Type
System.Int32

HTGROWBOX

In a size box (same as HTSIZE).

Declaration
public const int HTGROWBOX = 4
Field Value
Type
System.Int32

HTHELP

In a Help button.

Declaration
public const int HTHELP = 21
Field Value
Type
System.Int32

HTLEFT

In the left corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTLEFT = 10
Field Value
Type
System.Int32

HTMAXBUTTON

In a Maximize button.

Declaration
public const int HTMAXBUTTON = 9
Field Value
Type
System.Int32

HTMENU

In a menu.

Declaration
public const int HTMENU = 5
Field Value
Type
System.Int32

HTMINBUTTON

In a Minimize button.

Declaration
public const int HTMINBUTTON = 8
Field Value
Type
System.Int32

HTNOWHERE

On the screen background or on a dividing line between windows.

Declaration
public const int HTNOWHERE = 0
Field Value
Type
System.Int32

HTRIGHT

In the right corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTRIGHT = 11
Field Value
Type
System.Int32

HTSYSMENU

In a window menu or in a Close button in a child window.

Declaration
public const int HTSYSMENU = 3
Field Value
Type
System.Int32

HTTOP

In the top corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTTOP = 12
Field Value
Type
System.Int32

HTTOPLEFT

In the top-left corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTTOPLEFT = 13
Field Value
Type
System.Int32

HTTOPRIGHT

In the top-right corner of a border of a re-sizable window (the user can click the mouse to resize the window diagonally).

Declaration
public const int HTTOPRIGHT = 14
Field Value
Type
System.Int32

HWND_BOTTOM

Places the window at the bottom of the Z order. If the hWnd parameter identifies a topmost window, the window loses its topmost status and is placed at the bottom of all other windows.

Declaration
public const int HWND_BOTTOM = 1
Field Value
Type
System.Int32

HWND_NOTOPMOST

Places the window above all non-topmost windows (that is, behind all topmost windows). This flag has no effect if the window is already a non-topmost window.

Declaration
public const int HWND_NOTOPMOST = -2
Field Value
Type
System.Int32

HWND_TOP

Places the window at the top of the Z order.

Declaration
public const int HWND_TOP = 0
Field Value
Type
System.Int32

HWND_TOPMOST

Places the window above all non-topmost windows. The window maintains its topmost position even when it is deactivated.

Declaration
public const int HWND_TOPMOST = -1
Field Value
Type
System.Int32

INFINITE

A constant used to specify an infinite waiting period, for threading methods that accept an Int32 parameter.

Declaration
public const uint INFINITE = 4294967295U
Field Value
Type
System.UInt32

LOGPIXELSX

Represents the adding of pixel in horizontal.

Declaration
public const int LOGPIXELSX = 88
Field Value
Type
System.Int32

LOGPIXELSY

Represents the adding of pixel in vertical.

Declaration
public const int LOGPIXELSY = 90
Field Value
Type
System.Int32

LVM_FIRST

Sets the list-view control first item.

Declaration
public const int LVM_FIRST = 4096
Field Value
Type
System.Int32

LVM_SCROLL

Scrolls the content of a list-view control.

Declaration
public const int LVM_SCROLL = 4116
Field Value
Type
System.Int32

MA_ACTIVATE

Activates the window, and does not discard the mouse message.

Declaration
public const int MA_ACTIVATE = 1
Field Value
Type
System.Int32

MA_ACTIVATEANDEAT

Activates the window, and discards the mouse message.

Declaration
public const int MA_ACTIVATEANDEAT = 2
Field Value
Type
System.Int32

MA_NOACTIVATE

Does not activate the window, and does not discard the mouse message.

Declaration
public const int MA_NOACTIVATE = 3
Field Value
Type
System.Int32

MA_NOACTIVATEANDEAT

Does not activate the window, but discards the mouse message.

Declaration
public const int MA_NOACTIVATEANDEAT = 4
Field Value
Type
System.Int32

MK_CONTROL

The CTRL key is down.

Declaration
public const int MK_CONTROL = 8
Field Value
Type
System.Int32

MK_LBUTTON

The left mouse button is down.

Declaration
public const int MK_LBUTTON = 1
Field Value
Type
System.Int32

MK_MBUTTON

The middle mouse button is down.

Declaration
public const int MK_MBUTTON = 16
Field Value
Type
System.Int32

MK_RBUTTON

The right mouse button is down.

Declaration
public const int MK_RBUTTON = 2
Field Value
Type
System.Int32

MK_SHIFT

The middle mouse button is down.

Declaration
public const int MK_SHIFT = 4
Field Value
Type
System.Int32

OBJID_HSCROLL

The window's Horizontal scroll bar.

Declaration
public const uint OBJID_HSCROLL = 4294967290U
Field Value
Type
System.UInt32

OBJID_VSCROLL

The window's vertical scroll bar.

Declaration
public const uint OBJID_VSCROLL = 4294967291U
Field Value
Type
System.UInt32

PLANES

Represents the planes.

Declaration
public const int PLANES = 14
Field Value
Type
System.Int32

QS_ALLEVENTS

An input, WM_TIMER, WM_PAINT, WM_HOTKEY, or posted message is in the queue.

Declaration
public const int QS_ALLEVENTS = 1215
Field Value
Type
System.Int32

QS_ALLINPUT

Any message is in the queue.

Declaration
public const int QS_ALLINPUT = 1279
Field Value
Type
System.Int32

QS_ALLPOSTMESSAGE

A posted message (other than those listed here) is in the queue.

Declaration
public const int QS_ALLPOSTMESSAGE = 256
Field Value
Type
System.Int32

QS_HOTKEY

A WM_HOTKEY message is in the queue.

Declaration
public const int QS_HOTKEY = 128
Field Value
Type
System.Int32

QS_INPUT

An input message is in the queue.

Declaration
public const int QS_INPUT = 1031
Field Value
Type
System.Int32

QS_KEY

A WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, or WM_SYSKEYDOWN message is in the queue.

Declaration
public const int QS_KEY = 1
Field Value
Type
System.Int32

QS_MOUSE

A WM_MOUSEMOVE message or mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on).

Declaration
public const int QS_MOUSE = 6
Field Value
Type
System.Int32

QS_MOUSEBUTTON

A mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on).

Declaration
public const int QS_MOUSEBUTTON = 4
Field Value
Type
System.Int32

QS_MOUSEMOVE

A WM_MOUSEMOVE message is in Queue.

Declaration
public const int QS_MOUSEMOVE = 2
Field Value
Type
System.Int32

QS_PAINT

A WM_PAINT message is in the queue.

Declaration
public const int QS_PAINT = 32
Field Value
Type
System.Int32

QS_POSTMESSAGE

A posted message (other than those listed here) is in the queue.

Declaration
public const int QS_POSTMESSAGE = 8
Field Value
Type
System.Int32

QS_RAWINPUT

A raw input message is in the queue. For more information, see Raw Input.

Declaration
public const int QS_RAWINPUT = 1024
Field Value
Type
System.Int32

QS_SENDMESSAGE

A message sent by another thread or application is in the queue.

Declaration
public const int QS_SENDMESSAGE = 64
Field Value
Type
System.Int32

QS_TIMER

A WM_TIMER message is in the queue.

Declaration
public const int QS_TIMER = 16
Field Value
Type
System.Int32

RDW_ALLCHILDREN

Includes the child windows in the repainting operation.

Declaration
public const int RDW_ALLCHILDREN = 128
Field Value
Type
System.Int32

RDW_ERASE

Causes the window to receive a WM_ERASEBKGND message when the window is repainted. The RDW_INVALIDATE flag must also be specified; otherwise RDW_ERASE has no effect.

Declaration
public const int RDW_ERASE = 4
Field Value
Type
System.Int32

RDW_ERASENOW

Causes the affected windows (as specified by the RDW_ALLCHILDREN and RDW_NOCHILDREN flags) to receive WM_NCPAINT and WM_ERASEBKGND messages, if necessary, before the function returns. WM_PAINT messages are received at the ordinary time.

Declaration
public const int RDW_ERASENOW = 512
Field Value
Type
System.Int32

RDW_FRAME

Causes any part of the non-client area of the window that intersects the update region to receive a WM_NCPAINT message. The RDW_INVALIDATE flag must also be specified; otherwise, RDW_FRAME has no effect. The WM_NCPAINT message is typically not sent during the execution of RedrawWindow unless either RDW_UPDATENOW or RDW_ERASENOW is specified.

Declaration
public const int RDW_FRAME = 1024
Field Value
Type
System.Int32

RDW_INTERNALPAINT

Causes a WM_PAINT message to be posted to the window regardless of whether the window contains an invalid region.

Declaration
public const int RDW_INTERNALPAINT = 2
Field Value
Type
System.Int32

RDW_INVALIDATE

Indicates the invalidate.

Declaration
public const int RDW_INVALIDATE = 1
Field Value
Type
System.Int32

RDW_NOCHILDREN

Excludes child windows, if any, from the repainting operation

Declaration
public const int RDW_NOCHILDREN = 64
Field Value
Type
System.Int32

RDW_NOERASE

Suppress the pending WM_ERASEBKGND messages.

Declaration
public const int RDW_NOERASE = 32
Field Value
Type
System.Int32

RDW_NOFRAME

Causes the window to receive a WM_ERASEBKGND message when the window is repainted. The RDW_INVALIDATE flag must also be specified; otherwise, RDW_ERASE has no effect.

Declaration
public const int RDW_NOFRAME = 2048
Field Value
Type
System.Int32

RDW_NOINTERNALPAINT

Suppresses any pending internal WM_PAINT messages. This flag does not affect WM_PAINT messages resulting from invalid areas.

Declaration
public const int RDW_NOINTERNALPAINT = 16
Field Value
Type
System.Int32

RDW_UPDATENOW

Causes the affected windows (as specified by the RDW_ALLCHILDREN and RDW_NOCHILDREN flags) to receive WM_NCPAINT, WM_ERASEBKGND, and WM_PAINT messages, if necessary, before the function returns.

Declaration
public const int RDW_UPDATENOW = 256
Field Value
Type
System.Int32

RDW_VALIDATE

Occurs while validating the entire window. This flag does not affect internal WM_PAINT messages.

Declaration
public const int RDW_VALIDATE = 8
Field Value
Type
System.Int32

RGN_AND

Creates the intersection of the two combined regions.

Declaration
public const int RGN_AND = 1
Field Value
Type
System.Int32

RGN_COPY

Creates a copy of the region identified by hrgnSrc1.

Declaration
public const int RGN_COPY = 5
Field Value
Type
System.Int32

RGN_DIFF

Combines the parts of hrgnSrc1 that are not part of hrgnSrc2.

Declaration
public const int RGN_DIFF = 4
Field Value
Type
System.Int32

RGN_OR

Creates the union of two combined regions.

Declaration
public const int RGN_OR = 2
Field Value
Type
System.Int32

RGN_XOR

Creates the union of two combined regions except for any overlapping areas.

Declaration
public const int RGN_XOR = 3
Field Value
Type
System.Int32

SB_CTL

A scroll bar control

Declaration
public const int SB_CTL = 2
Field Value
Type
System.Int32

SB_HORZ

The horizontal scroll bar of the specified window.

Declaration
public const int SB_HORZ = 0
Field Value
Type
System.Int32

SB_THUMBPOSITION

The Thumb position of the scroll bar.

Declaration
public const int SB_THUMBPOSITION = 4
Field Value
Type
System.Int32

SB_VERT

The vertical scroll bar of the specified window.

Declaration
public const int SB_VERT = 1
Field Value
Type
System.Int32

SBM_ENABLE_ARROWS

Occurs while enable or disable both arrows in scrollbar.

Declaration
public const int SBM_ENABLE_ARROWS = 228
Field Value
Type
System.Int32

SBM_GETPOS

Occurs when GridScrollPos is called.

Declaration
public const int SBM_GETPOS = 225
Field Value
Type
System.Int32

SBM_GETRANGE

Occurs when GetSCrollRange function is called.

Declaration
public const int SBM_GETRANGE = 227
Field Value
Type
System.Int32

SBM_GETSCROLLINFO

Sent by an application to retrieve information about the specified scroll bar.

Declaration
public const int SBM_GETSCROLLINFO = 234
Field Value
Type
System.Int32

SBM_SETPOS

Occurs when SetScrollPos is called.

Declaration
public const int SBM_SETPOS = 224
Field Value
Type
System.Int32

SBM_SETRANGE

Occurs while setting the min and maximum range of the scroll control.

Declaration
public const int SBM_SETRANGE = 226
Field Value
Type
System.Int32

SBM_SETRANGEREDRAW

Occurs while setting the minimum and maximum position values and to redraw the control.

Declaration
public const int SBM_SETRANGEREDRAW = 230
Field Value
Type
System.Int32

SBM_SETSCROLLINFO

Occurs while setting the scroll info.

Declaration
public const int SBM_SETSCROLLINFO = 233
Field Value
Type
System.Int32

SC_CLOSE

Closes the window.

Declaration
public const int SC_CLOSE = 61536
Field Value
Type
System.Int32

SC_CONTEXTHELP

Changes the cursor to a question mark with a pointer. If the user then clicks a control in the dialog box, the control receives a WM_HELP message.

Declaration
public const int SC_CONTEXTHELP = 61824
Field Value
Type
System.Int32

SC_DEFAULT

Selects the default item; the user double-clicked the window menu.

Declaration
public const int SC_DEFAULT = 61792
Field Value
Type
System.Int32

SC_HOTKEY

Activates the window associated with the application-specified hot key. The lParam parameter identifies the window to activate.

Declaration
public const int SC_HOTKEY = 61776
Field Value
Type
System.Int32

SC_KEYMENU

Retrieves the window menu as a result of a keystroke. For more information, see the Remarks section.

Declaration
public const int SC_KEYMENU = 61696
Field Value
Type
System.Int32

SC_MAXIMIZE

Maximizes the window.

Declaration
public const int SC_MAXIMIZE = 61488
Field Value
Type
System.Int32

SC_MINIMIZE

Minimizes the window.

Declaration
public const int SC_MINIMIZE = 61472
Field Value
Type
System.Int32

SC_MOUSEMENU

Retrieves the window menu as a result of a mouse click.

Declaration
public const int SC_MOUSEMENU = 61584
Field Value
Type
System.Int32

SC_MOVE

Moves the window.

Declaration
public const int SC_MOVE = 61456
Field Value
Type
System.Int32

SC_RESTORE

Restores the window to its normal position and size.

Declaration
public const int SC_RESTORE = 61728
Field Value
Type
System.Int32

SC_SIZE

Sizes the window.

Declaration
public const int SC_SIZE = 61440
Field Value
Type
System.Int32

SPI_GETWORKAREA

Retrieves the size of the work area on the primary display monitor.

Declaration
public const int SPI_GETWORKAREA = 48
Field Value
Type
System.Int32

SRCCOPY

Copies the source rectangle directly to the destination rectangle.

Declaration
public const int SRCCOPY = 13369376
Field Value
Type
System.Int32

SW_ERASE

Erases the newly invalidated region by sending a WM_ERASEBKGND message to the window when specified with the SW_INVALIDATE flag.

Declaration
public const int SW_ERASE = 4
Field Value
Type
System.Int32

SW_HIDE

Hides the window and activates another window.

Declaration
public const int SW_HIDE = 0
Field Value
Type
System.Int32

SW_INVALIDATE

Invalidates the region identified by the hrgnUpdate parameter after scrolling.

Declaration
public const int SW_INVALIDATE = 2
Field Value
Type
System.Int32

SW_SCROLLCHILDREN

Scrolls all child windows that intersect the rectangle pointed to by the prcScroll parameter. The child windows are scrolled by the number of pixels specified by the dx and dy parameters. The system sends a WM_MOVE message to all child windows that intersect the prcScroll rectangle, even if they do not move.

Declaration
public const int SW_SCROLLCHILDREN = 1
Field Value
Type
System.Int32

SW_SHOWMAXIMIZED

Activates the window and displays it as a maximized window.

Declaration
public const int SW_SHOWMAXIMIZED = 3
Field Value
Type
System.Int32

SW_SHOWMINIMIZED

Activates the window and displays it as a minimized window.

Declaration
public const int SW_SHOWMINIMIZED = 2
Field Value
Type
System.Int32

SW_SHOWNORMAL

Activates and displays a window. If the window is minimized or maximized, the system restores it to its original size and position. An application should specify this flag when displaying the window for the first time.

Declaration
public const int SW_SHOWNORMAL = 1
Field Value
Type
System.Int32

SW_SMOOTHSCROLL

Scrolls using smooth scrolling. Use the HIWORD portion of the flags parameter to indicate how much time, in milliseconds, the smooth-scrolling operation should take.

Declaration
public const int SW_SMOOTHSCROLL = 16
Field Value
Type
System.Int32

SWP_FRAMECHANGED

Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.

Declaration
public const int SWP_FRAMECHANGED = 32
Field Value
Type
System.Int32

SWP_HIDEWINDOW

Hides the window.

Declaration
public const int SWP_HIDEWINDOW = 128
Field Value
Type
System.Int32

SWP_NOACTIVATE

Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter parameter).

Declaration
public const int SWP_NOACTIVATE = 16
Field Value
Type
System.Int32

SWP_NOCOPYBITS

Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.

Declaration
public const int SWP_NOCOPYBITS = 256
Field Value
Type
System.Int32

SWP_NOMOVE

Retains the current position (ignores X and Y parameters).

Declaration
public const int SWP_NOMOVE = 2
Field Value
Type
System.Int32

SWP_NOOWNERZORDER

Does not change the owner window's position in the Z order.

Declaration
public const int SWP_NOOWNERZORDER = 512
Field Value
Type
System.Int32

SWP_NOREDRAW

Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the non-client area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.

Declaration
public const int SWP_NOREDRAW = 8
Field Value
Type
System.Int32

SWP_NOSENDCHANGING

Prevents the window from receiving the WM_WINDOWPOSCHANGING message.

Declaration
public const int SWP_NOSENDCHANGING = 1024
Field Value
Type
System.Int32

SWP_NOSIZE

Retains the current size (ignores the cx and cy parameters).

Declaration
public const int SWP_NOSIZE = 1
Field Value
Type
System.Int32

SWP_NOZORDER

Retains the current Z order (ignores the hWndInsertAfter parameter).

Declaration
public const int SWP_NOZORDER = 4
Field Value
Type
System.Int32

SWP_SHOWWINDOW

Displays the window.

Declaration
public const int SWP_SHOWWINDOW = 64
Field Value
Type
System.Int32

TME_LEAVE

A Notification is delivered as a WM_MOUSELEAVE message. If the mouse is not over the specified window or area, a leave notification is generated immediately and no further tracking is performed.

Declaration
public const int TME_LEAVE = 2
Field Value
Type
System.Int32

TME_NONCLIENT

If the mouse is hover on or leave from the non client areas a notification is delivered as WM_NCMOUSEHOVER and WM_NCMOUSELEAVE messages.

Declaration
public const int TME_NONCLIENT = 16
Field Value
Type
System.Int32

UllArgumentsBitMask

One of the fields in GESTUREINFO structure is type of System.Int64 (8 bytes). The relevant gesture information is stored in lower 4 bytes. This bit mask is used to get 4 lower bytes from this argument.

Declaration
public const long UllArgumentsBitMask = 4294967295L
Field Value
Type
System.Int64

WA_ACTIVE

Activated by some method other than a mouse click (for example, by a call to the SetActiveWindow function or by use of the keyboard interface to select the window).

Declaration
public const int WA_ACTIVE = 1
Field Value
Type
System.Int32

WA_CLICKACTIVE

Activated by a mouse click.

Declaration
public const int WA_CLICKACTIVE = 2
Field Value
Type
System.Int32

WA_INACTIVE

Indicates the deactivated.

Declaration
public const int WA_INACTIVE = 0
Field Value
Type
System.Int32

WAIT_OBJECT_0

The state of the specified object is signaled.

Declaration
public const int WAIT_OBJECT_0 = 0
Field Value
Type
System.Int32

WAIT_TIMEOUT

The time-out interval elapsed, and the object's state is non-signaled.

Declaration
public const int WAIT_TIMEOUT = 258
Field Value
Type
System.Int32

WM_ACTIVATE

Sent to both the window being activated and the window being deactivated. If the windows use the same input queue, the message is sent synchronously, first to the window procedure of the top-level window being deactivated, then to the window procedure of the top-level window being activated. If the windows use different input queues, the message is sent asynchronously, so the window is activated immediately.

Declaration
public const int WM_ACTIVATE = 6
Field Value
Type
System.Int32

WM_ACTIVATEAPP

Sent when a window belonging to a different application than the active window is about to be activated. The message is sent to the application whose window is being activated and to the application whose window is being deactivated.

Declaration
public const int WM_ACTIVATEAPP = 28
Field Value
Type
System.Int32

WM_AFXFIRST

Represents the window message Affix first.

Declaration
public const int WM_AFXFIRST = 864
Field Value
Type
System.Int32

WM_AFXLAST

Represents the window message Affix last.

Declaration
public const int WM_AFXLAST = 895
Field Value
Type
System.Int32

WM_APP

Used to define private messages, usually of the form WM_APP+x, where x is an integer value.

Declaration
public const int WM_APP = 32768
Field Value
Type
System.Int32

WM_ASKCBFORMATNAME

Sent to the clipboard owner by a clipboard viewer window to request the name of a CF_OWNERDISPLAY clipboard format.

Declaration
public const int WM_ASKCBFORMATNAME = 780
Field Value
Type
System.Int32

WM_CANCELJOURNAL

Posted to an application when a user cancels the application's journaling activities. The message is posted with a NULL window handle.

Declaration
public const int WM_CANCELJOURNAL = 75
Field Value
Type
System.Int32

WM_CANCELMODE

Sent to cancel certain modes, such as mouse capture. For example, the system sends this message to the active window when a dialog box or message box is displayed. Certain functions also send this message explicitly to the specified window regardless of whether it is the active window. For example, the EnableWindow function sends this message when disabling the specified window.

Declaration
public const int WM_CANCELMODE = 31
Field Value
Type
System.Int32

WM_CAPTURECHANGED

Sent to the window that is losing the mouse capture.

Declaration
public const int WM_CAPTURECHANGED = 533
Field Value
Type
System.Int32

WM_CHANGECBCHAIN

Sent to the first window in the clipboard viewer chain when a window is being removed from the chain.

Declaration
public const int WM_CHANGECBCHAIN = 781
Field Value
Type
System.Int32

WM_CHANGEUISTATE

An application sends the WM_CHANGEUISTATE message to indicate that the UI state should be changed.

Declaration
public const int WM_CHANGEUISTATE = 295
Field Value
Type
System.Int32

WM_CHAR

Posted to the window with the keyboard focus when a WM_KEYDOWN message is translated by the TranslateMessage function. The WM_CHAR message contains the character code of the key that was pressed.

Declaration
public const int WM_CHAR = 258
Field Value
Type
System.Int32

WM_CHARTOITEM

Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a WM_CHAR message.

Declaration
public const int WM_CHARTOITEM = 47
Field Value
Type
System.Int32

WM_CHILDACTIVATE

Sent to a child window when the user clicks the window's title bar or when the window is activated, moved, or sized.

Declaration
public const int WM_CHILDACTIVATE = 34
Field Value
Type
System.Int32

WM_CHOOSEFONT_GETLOGFONT

An application sends the WM_CHOOSEFONT_GETLOGFONT message to a Font dialog box to retrieve information about the user's current font selections.

Declaration
public const int WM_CHOOSEFONT_GETLOGFONT = 1025
Field Value
Type
System.Int32

WM_CLEAR

An application sends a WM_CLEAR message to an edit control or combo box to delete (clear) the current selection, if any, from the edit control.

Declaration
public const int WM_CLEAR = 771
Field Value
Type
System.Int32

WM_CLOSE

Sent as a signal that a window or an application should terminate.

Declaration
public const int WM_CLOSE = 16
Field Value
Type
System.Int32

WM_COMMAND

Sent when the user selects a command item from a menu, when a control sends a notification message to its parent window, or when an accelerator keystroke is translated.

Declaration
public const int WM_COMMAND = 273
Field Value
Type
System.Int32

WM_COMMNOTIFY

Represents the common action is performed.

Declaration
public const int WM_COMMNOTIFY = 68
Field Value
Type
System.Int32

WM_COMPACTING

Sent to all top-level windows when the system detects more than 12.5 percent of system time over a 30- to 60-second interval is being spent compacting memory. This indicates that system memory is low.

Declaration
public const int WM_COMPACTING = 65
Field Value
Type
System.Int32

WM_COMPAREITEM

Sent to determine the relative position of a new item in the sorted list of an owner-drawn combo box or list box. Whenever the application adds a new item, the system sends this message to the owner of a combo box or list box created with the CBS_SORT or LBS_SORT style.

Declaration
public const int WM_COMPAREITEM = 57
Field Value
Type
System.Int32

WM_CONTEXTMENU

Notifies a window that the user clicked the right mouse button (right-clicked) in the window.

Declaration
public const int WM_CONTEXTMENU = 123
Field Value
Type
System.Int32

WM_COPY

An application sends the WM_COPY message to an edit control or combo box to copy the current selection to the clipboard in CF_TEXT format.

Declaration
public const int WM_COPY = 769
Field Value
Type
System.Int32

WM_COPYDATA

An application sends the WM_COPYDATA message to pass data to another application.

Declaration
public const int WM_COPYDATA = 74
Field Value
Type
System.Int32

WM_CREATE

Sent when an application requests that a window be created by calling the CreateWindowEx or CreateWindow function. (The message is sent before the function returns.) The window procedure of the new window receives this message after the window is created, but before the window becomes visible.

Declaration
public const int WM_CREATE = 1
Field Value
Type
System.Int32

WM_CTLCOLORBTN

The WM_CTLCOLORBTN message is sent to the parent window of a button before drawing the button. The parent window can change the button's text and background colors. However, only owner-drawn buttons respond to the parent window processing this message.

Declaration
public const int WM_CTLCOLORBTN = 309
Field Value
Type
System.Int32

WM_CTLCOLORDLG

Sent to a dialog box before the system draws the dialog box. By responding to this message, the dialog box can set its text and background colors using the specified display device context handle.

Declaration
public const int WM_CTLCOLORDLG = 310
Field Value
Type
System.Int32

WM_CTLCOLOREDIT

An edit control that is not read-only or disabled sends the WM_CTLCOLOREDIT message to its parent window when the control is about to be drawn. By responding to this message, the parent window can use the specified device context handle to set the text and background colors of the edit control.

Declaration
public const int WM_CTLCOLOREDIT = 307
Field Value
Type
System.Int32

WM_CTLCOLORLISTBOX

Sent to the parent window of a list box before the system draws the list box. By responding to this message, the parent window can set the text and background colors of the list box by using the specified display device context handle.

Declaration
public const int WM_CTLCOLORLISTBOX = 308
Field Value
Type
System.Int32

WM_CTLCOLORMSGBOX

Send to owner window before draws the MessageBox.

Declaration
public const int WM_CTLCOLORMSGBOX = 306
Field Value
Type
System.Int32

WM_CTLCOLORSCROLLBAR

Occurs while the scroll bar is drawn. by handling this message user can customize the background color of the scrollbar.

Declaration
public const int WM_CTLCOLORSCROLLBAR = 311
Field Value
Type
System.Int32

WM_CTLCOLORSTATIC

A static control, or an edit control that is read-only or disabled, sends the WM_CTLCOLORSTATIC message to its parent window when the control is about to be drawn. By responding to this message, the parent window can use the specified device context handle to set the text foreground and background colors of the static control.

Declaration
public const int WM_CTLCOLORSTATIC = 312
Field Value
Type
System.Int32

WM_CUT

An application sends a WM_CUT message to an edit control or combo box to delete (cut) the current selection, if any, in the edit control and copy the deleted text to the clipboard in CF_TEXT format.

Declaration
public const int WM_CUT = 768
Field Value
Type
System.Int32

WM_DDE_ACK

The WM_DDE_ACK message notifies a Dynamic Data Exchange (DDE) application of the receipt and processing of the following messages: WM_DDE_POKE, WM_DDE_EXECUTE, WM_DDE_DATA, WM_DDE_ADVISE, WM_DDE_UNADVISE, WM_DDE_INITIATE, or WM_DDE_REQUEST (in some cases).

Declaration
public const int WM_DDE_ACK = 996
Field Value
Type
System.Int32

WM_DDE_ADVISE

A Dynamic Data Exchange (DDE) client application posts the WM_DDE_ADVISE message to a DDE server application to request the server to supply an update for a data item whenever the item changes. To post this message, call the PostMessage function with the following parameters.

Declaration
public const int WM_DDE_ADVISE = 994
Field Value
Type
System.Int32

WM_DDE_DATA

A Dynamic Data Exchange (DDE) server application posts a WM_DDE_DATA message to a DDE client application to pass a data item to the client or to notify the client of the availability of a data item.

Declaration
public const int WM_DDE_DATA = 997
Field Value
Type
System.Int32

WM_DDE_EXECUTE

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_EXECUTE message to a DDE server application to send a string to the server to be processed as a series of commands. The server application is expected to post a WM_DDE_ACK message in response.

Declaration
public const int WM_DDE_EXECUTE = 1000
Field Value
Type
System.Int32

WM_DDE_FIRST

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_FIRST message to a DDE server application to send a string to the server to be processed as a series of commands. The server application is expected to post a WM_DDE_ACK message in response.

Declaration
public const int WM_DDE_FIRST = 992
Field Value
Type
System.Int32

WM_DDE_INITIATE

A Dynamic Data Exchange (DDE) client application sends a WM_DDE_INITIATE message to initiate a conversation with a server application responding to the specified application and topic names. Upon receiving this message, all server applications with names that match the specified application and that support the specified topic are expected to acknowledge it.

Declaration
public const int WM_DDE_INITIATE = 992
Field Value
Type
System.Int32

WM_DDE_LAST

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_LAST message to a DDE server application.

Declaration
public const int WM_DDE_LAST = 1000
Field Value
Type
System.Int32

WM_DDE_POKE

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_POKE message to a DDE server application. A client uses this message to request the server to accept an unsolicited data item. The server is expected to reply with a WM_DDE_ACK message indicating whether it accepted the data item.

Declaration
public const int WM_DDE_POKE = 999
Field Value
Type
System.Int32

WM_DDE_REQUEST

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_REQUEST message to a DDE server application to request the value of a data item.

Declaration
public const int WM_DDE_REQUEST = 998
Field Value
Type
System.Int32

WM_DDE_TERMINATE

A Dynamic Data Exchange (DDE) application (client or server) posts a WM_DDE_TERMINATE message to terminate a conversation.

Declaration
public const int WM_DDE_TERMINATE = 993
Field Value
Type
System.Int32

WM_DDE_UNADVISE

A Dynamic Data Exchange (DDE) client application posts a WM_DDE_UNADVISE message to inform a DDE server application that the specified item or a particular clipboard format for the item should no longer be updated. This terminates the warm or hot data link for the specified item.

Declaration
public const int WM_DDE_UNADVISE = 995
Field Value
Type
System.Int32

WM_DEADCHAR

Posted to the window with the keyboard focus when a WM_KEYUP message is translated by the TranslateMessage function. WM_DEADCHAR specifies a character code generated by a dead key. A dead key is a key that generates a character, such as the umlaut (double-dot), that is combined with another character to form a composite character. For example, the umlaut-O character (Ö) is generated by typing the dead key for the umlaut character, and then typing the O key.

Declaration
public const int WM_DEADCHAR = 259
Field Value
Type
System.Int32

WM_DELETEITEM

Sent to the owner of a list box or combo box when the list box or combo box is destroyed or when items are removed by the LB_DELETESTRING, LB_RESETCONTENT, CB_DELETESTRING, or CB_RESETCONTENT message. The system sends a WM_DELETEITEM message for each deleted item. The system sends the WM_DELETEITEM message for any deleted list box or combo box item with nonzero item data.

Declaration
public const int WM_DELETEITEM = 45
Field Value
Type
System.Int32

WM_DESTROY

Sent when a window is being destroyed. It is sent to the window procedure of the window being destroyed after the window is removed from the screen. This message is sent first to the window being destroyed and then to the child windows (if any) as they are destroyed. During the processing of the message, it can be assumed that all child windows still exist.

Declaration
public const int WM_DESTROY = 2
Field Value
Type
System.Int32

WM_DESTROYCLIPBOARD

Sent to the clipboard owner when a call to the EmptyClipboard function empties the clipboard.

Declaration
public const int WM_DESTROYCLIPBOARD = 775
Field Value
Type
System.Int32

WM_DEVICECHANGE

Notifies an application of a change to the hardware configuration of a device or the computer.

Declaration
public const int WM_DEVICECHANGE = 537
Field Value
Type
System.Int32

WM_DEVMODECHANGE

The WM_DEVMODECHANGE message is sent to all top-level windows whenever the user changes device-mode settings.

Declaration
public const int WM_DEVMODECHANGE = 27
Field Value
Type
System.Int32

WM_DISPLAYCHANGE

The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.

Declaration
public const int WM_DISPLAYCHANGE = 126
Field Value
Type
System.Int32

WM_DRAWCLIPBOARD

Sent to the first window in the clipboard viewer chain when the content of the clipboard changes. This enables a clipboard viewer window to display the new content of the clipboard.

Declaration
public const int WM_DRAWCLIPBOARD = 776
Field Value
Type
System.Int32

WM_DRAWITEM

Sent to the parent window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.

Declaration
public const int WM_DRAWITEM = 43
Field Value
Type
System.Int32

WM_DROPFILES

Sent when the user drops a file on the window of an application that has registered itself as a recipient of dropped files.

Declaration
public const int WM_DROPFILES = 563
Field Value
Type
System.Int32

WM_ENABLE

Sent when an application changes the enabled state of a window. It is sent to the window whose enabled state is changing. This message is sent before the EnableWindow function returns, but after the enabled state (WS_DISABLED style bit) of the window has changed.

Declaration
public const int WM_ENABLE = 10
Field Value
Type
System.Int32

WM_ENDSESSION

The WM_ENDSESSION message is sent to an application after the system processes the results of the WM_QUERYENDSESSION message. The WM_ENDSESSION message informs the application whether the session is ending.

Declaration
public const int WM_ENDSESSION = 22
Field Value
Type
System.Int32

WM_ENTERIDLE

Sent to the owner window of a modal dialog box or menu that is entering an idle state. A modal dialog box or menu enters an idle state when no messages are waiting in its queue after it has processed one or more previous messages.

Declaration
public const int WM_ENTERIDLE = 289
Field Value
Type
System.Int32

WM_ENTERMENULOOP

Notifies an application's main window procedure that a menu modal loop has been entered.

Declaration
public const int WM_ENTERMENULOOP = 529
Field Value
Type
System.Int32

WM_ENTERSIZEMOVE

Sent one time to a window after it enters the moving or sizing modal loop. The window enters the moving or sizing modal loop when the user clicks the window's title bar or sizing border, or when the window passes the WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the message specifies the SC_MOVE or SC_SIZE value. The operation is complete when DefWindowProc returns. The system sends the WM_ENTERSIZEMOVE message regardless of whether the dragging of full windows is enabled.

Declaration
public const int WM_ENTERSIZEMOVE = 561
Field Value
Type
System.Int32

WM_ERASEBKGND

Sent when the window background must be erased (for example, when a window is resized). The message is sent to prepare an invalidated portion of a window for painting.

Declaration
public const int WM_ERASEBKGND = 20
Field Value
Type
System.Int32

WM_EXITMENULOOP

Notifies an application's main window procedure that a menu modal loop has been exited.

Declaration
public const int WM_EXITMENULOOP = 530
Field Value
Type
System.Int32

WM_EXITSIZEMOVE

Sent one time to a window, after it has exited the moving or sizing modal loop. The window enters the moving or sizing modal loop when the user clicks the window's title bar or sizing border, or when the window passes the WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the message specifies the SC_MOVE or SC_SIZE value. The operation is complete when DefWindowProc returns.

Declaration
public const int WM_EXITSIZEMOVE = 562
Field Value
Type
System.Int32

WM_FONTCHANGE

An application sends the WM_FONTCHANGE message to all top-level windows in the system after changing the pool of font resources.

Declaration
public const int WM_FONTCHANGE = 29
Field Value
Type
System.Int32

WM_GESTURE

Passes the information about the gesture.

Declaration
public const int WM_GESTURE = 281
Field Value
Type
System.Int32

WM_GESTURENOTIFY

Provides the chance for configure the gestures. Handling the WM_GESTURENOTIFY message will change the gesture configuration for the lifetime of the Window, not just for the next gesture.

Declaration
public const int WM_GESTURENOTIFY = 282
Field Value
Type
System.Int32

WM_GETDLGCODE

Sent to the window procedure associated with a control. By default, the system handles all keyboard input to the control; the system interprets certain types of keyboard input as dialog box navigation keys. To override this default behavior, the control can respond to the WM_GETDLGCODE message to indicate the types of input it wants to process itself.

Declaration
public const int WM_GETDLGCODE = 135
Field Value
Type
System.Int32

WM_GETFONT

Retrieves the font with which the control is currently drawing its text.

Declaration
public const int WM_GETFONT = 49
Field Value
Type
System.Int32

WM_GETHOTKEY

Sent to determine the hot key associated with a window.

Declaration
public const int WM_GETHOTKEY = 51
Field Value
Type
System.Int32

WM_GETICON

Sent to a window to retrieve a handle to the large or small icon associated with a window. The system displays the large icon in the ALT+TAB dialog, and the small icon in the window caption.

Declaration
public const int WM_GETICON = 127
Field Value
Type
System.Int32

WM_GETMINMAXINFO

Sent to a window when the size or position of the window is about to change. An application can use this message to override the window's default maximized size and position, or its default minimum or maximum tracking size.

Declaration
public const int WM_GETMINMAXINFO = 36
Field Value
Type
System.Int32

WM_GETOBJECT

Sent by both Microsoft Active Accessibility and Microsoft UI Automation to obtain information about an accessible object contained in a server application.

Declaration
public const int WM_GETOBJECT = 61
Field Value
Type
System.Int32

WM_GETTEXT

Copies the text that corresponds to a window into a buffer provided by the caller.

Declaration
public const int WM_GETTEXT = 13
Field Value
Type
System.Int32

WM_GETTEXTLENGTH

Determines the length, in characters, of the text associated with a window.

Declaration
public const int WM_GETTEXTLENGTH = 14
Field Value
Type
System.Int32

WM_HANDHELDFIRST

Represents the window message that handled first.

Declaration
public const int WM_HANDHELDFIRST = 856
Field Value
Type
System.Int32

WM_HANDHELDLAST

Represents the window message that handled last.

Declaration
public const int WM_HANDHELDLAST = 863
Field Value
Type
System.Int32

WM_HELP

Indicates that the user pressed the F1 key. If a menu is active when F1 is pressed, WM_HELP is sent to the window associated with the menu; otherwise, WM_HELP is sent to the window that has the keyboard focus. If no window has the keyboard focus, WM_HELP is sent to the currently active window.

Declaration
public const int WM_HELP = 83
Field Value
Type
System.Int32

WM_HOTKEY

Posted when the user presses a hot key registered by the RegisterHotKey function. The message is placed at the top of the message queue associated with the thread that registered the hot key.

Declaration
public const int WM_HOTKEY = 786
Field Value
Type
System.Int32

WM_HSCROLL

Occurs when the horizontal scrolling is made on the control or scrollbar.

Declaration
public const int WM_HSCROLL = 276
Field Value
Type
System.Int32

WM_HSCROLLCLIPBOARD

Sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and an event occurs in the clipboard viewer's horizontal scroll bar. The owner should scroll the clipboard image and update the scroll bar values.

Declaration
public const int WM_HSCROLLCLIPBOARD = 782
Field Value
Type
System.Int32

WM_ICONERASEBKGND

This message is sent to a minimized window when the background of the icon must be filled before painting the icon. A window receives this message only if a class icon is defined for the window; otherwise, WM_ERASEBKGND is sent.

Declaration
public const int WM_ICONERASEBKGND = 39
Field Value
Type
System.Int32

WM_IME_CHAR

Sent to an application when the IME gets a character of the conversion result.

Declaration
public const int WM_IME_CHAR = 646
Field Value
Type
System.Int32

WM_IME_COMPOSITION

Sent to an application when the IME changes composition status as a result of a keystroke. A window receives this message through its WindowProc function.

Declaration
public const int WM_IME_COMPOSITION = 271
Field Value
Type
System.Int32

WM_IME_COMPOSITIONFULL

Sent to an application when the IME window finds no space to extend the area for the composition window.

Declaration
public const int WM_IME_COMPOSITIONFULL = 644
Field Value
Type
System.Int32

WM_IME_CONTROL

Sent by an application to direct the IME window to carry out the requested command. The application uses this message to control the IME window that it has created. To send this message, the application calls the SendMessage function with the following parameters.

Declaration
public const int WM_IME_CONTROL = 643
Field Value
Type
System.Int32

WM_IME_ENDCOMPOSITION

Sent to an application when the IME ends composition. A window receives this message through its WindowProc function.

Declaration
public const int WM_IME_ENDCOMPOSITION = 270
Field Value
Type
System.Int32

WM_IME_KEYDOWN

Sent to an application by the IME to notify the application of a key press and to keep message order.

Declaration
public const int WM_IME_KEYDOWN = 656
Field Value
Type
System.Int32

WM_IME_KEYLAST

Sent to an application by the IME to notify the application of a key last and to keep message order.

Declaration
public const int WM_IME_KEYLAST = 271
Field Value
Type
System.Int32

WM_IME_KEYUP

Sent to an application by the IME to notify the application of a key release and to keep message order

Declaration
public const int WM_IME_KEYUP = 657
Field Value
Type
System.Int32

WM_IME_NOTIFY

Sent to an application to notify it of changes to the IME window.

Declaration
public const int WM_IME_NOTIFY = 642
Field Value
Type
System.Int32

WM_IME_SELECT

Sent to an application when the operating system is about to change the current IME.

Declaration
public const int WM_IME_SELECT = 645
Field Value
Type
System.Int32

WM_IME_SETCONTEXT

Sent to an application when a window is activated.

Declaration
public const int WM_IME_SETCONTEXT = 641
Field Value
Type
System.Int32

WM_IME_STARTCOMPOSITION

Sent immediately before the IME generates the composition string as a result of a keystroke.

Declaration
public const int WM_IME_STARTCOMPOSITION = 269
Field Value
Type
System.Int32

WM_INITDIALOG

Sent to the dialog box procedure immediately before a dialog box is displayed. Dialog box procedures typically use this message to initialize controls and carry out any other initialization tasks that affect the appearance of the dialog box.

Declaration
public const int WM_INITDIALOG = 272
Field Value
Type
System.Int32

WM_INITMENU

Sent when a menu is about to become active. It occurs when the user clicks an item on the menu bar or presses a menu key. This allows the application to modify the menu before it is displayed.

Declaration
public const int WM_INITMENU = 278
Field Value
Type
System.Int32

WM_INITMENUPOPUP

Sent when a drop-down menu or submenu is about to become active. This allows an application to modify the menu before it is displayed, without changing the entire menu.

Declaration
public const int WM_INITMENUPOPUP = 279
Field Value
Type
System.Int32

WM_INPUTLANGCHANGE

Sent to the topmost affected window after an application's input language has been changed. You should make any application-specific settings and pass the message to the DefWindowProc function, which passes the message to all first-level child windows. These child windows can pass the message to DefWindowProc to have it pass the message to their child windows, and so on.

Declaration
public const int WM_INPUTLANGCHANGE = 81
Field Value
Type
System.Int32

WM_INPUTLANGCHANGEREQUEST

Posted to the window with the focus when the user chooses a new input language, either with the hotkey (specified in the Keyboard control panel application) or from the indicator on the system taskbar. An application can accept the change by passing the message to the DefWindowProc function or reject the change (and prevent it from taking place) by returning immediately.

Declaration
public const int WM_INPUTLANGCHANGEREQUEST = 80
Field Value
Type
System.Int32

WM_KEYDOWN

Posted to the window with the keyboard focus when a nonsystem key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed.

Declaration
public const int WM_KEYDOWN = 256
Field Value
Type
System.Int32

WM_KEYFIRST

This message filters for keyboard messages.

Declaration
public const int WM_KEYFIRST = 256
Field Value
Type
System.Int32

WM_KEYLAST

This message filters for keyboard messages.

Declaration
public const int WM_KEYLAST = 264
Field Value
Type
System.Int32

WM_KEYUP

Posted to the window with the keyboard focus when a nonsystem key is released. A nonsystem key is a key that is pressed when the ALT key is not pressed, or a keyboard key that is pressed when a window has the keyboard focus.

Declaration
public const int WM_KEYUP = 257
Field Value
Type
System.Int32

WM_KILLFOCUS

Sent to a window immediately before it loses the keyboard focus.

Declaration
public const int WM_KILLFOCUS = 8
Field Value
Type
System.Int32

WM_LBUTTONDBLCLK

Posted when the user double-clicks the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_LBUTTONDBLCLK = 515
Field Value
Type
System.Int32

WM_LBUTTONDOWN

Posted when the user presses the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_LBUTTONDOWN = 513
Field Value
Type
System.Int32

WM_LBUTTONUP

Posted when the user releases the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_LBUTTONUP = 514
Field Value
Type
System.Int32

WM_MBUTTONDBLCLK

Posted when the user double-clicks the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_MBUTTONDBLCLK = 521
Field Value
Type
System.Int32

WM_MBUTTONDOWN

Posted when the user presses the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_MBUTTONDOWN = 519
Field Value
Type
System.Int32

WM_MBUTTONUP

Posted when the user releases the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_MBUTTONUP = 520
Field Value
Type
System.Int32

WM_MDIACTIVATE

An application sends the WM_MDIACTIVATE message to a multiple-document interface (MDI) client window to instruct the client window to activate a different MDI child window.

Declaration
public const int WM_MDIACTIVATE = 546
Field Value
Type
System.Int32

WM_MDICASCADE

An application sends the WM_MDICASCADE message to a multiple-document interface (MDI) client window to arrange all its child windows in a cascade format.

Declaration
public const int WM_MDICASCADE = 551
Field Value
Type
System.Int32

WM_MDICREATE

An application sends the WM_MDICREATE message to a multiple-document interface (MDI) client window to create an MDI child window.

Declaration
public const int WM_MDICREATE = 544
Field Value
Type
System.Int32

WM_MDIDESTROY

An application sends the WM_MDIDESTROY message to a multiple-document interface (MDI) client window to close an MDI child window.

Declaration
public const int WM_MDIDESTROY = 545
Field Value
Type
System.Int32

WM_MDIGETACTIVE

An application sends the WM_MDIGETACTIVE message to a multiple-document interface (MDI) client window to retrieve the handle to the active MDI child window.

Declaration
public const int WM_MDIGETACTIVE = 553
Field Value
Type
System.Int32

WM_MDIICONARRANGE

An application sends the WM_MDIICONARRANGE message to a multiple-document interface (MDI) client window to arrange all minimized MDI child windows. It does not affect child windows that are not minimized.

Declaration
public const int WM_MDIICONARRANGE = 552
Field Value
Type
System.Int32

WM_MDIMAXIMIZE

An application sends the WM_MDIMAXIMIZE message to a multiple-document interface (MDI) client window to maximize an MDI child window. The system resizes the child window to make its client area fill the client window. The system places the child window's window menu icon in the rightmost position of the frame window's menu bar, and places the child window's restore icon in the leftmost position. The system also appends the title bar text of the child window to that of the frame window.

Declaration
public const int WM_MDIMAXIMIZE = 549
Field Value
Type
System.Int32

WM_MDINEXT

An application sends the WM_MDINEXT message to a multiple-document interface (MDI) client window to activate the next or previous child window.

Declaration
public const int WM_MDINEXT = 548
Field Value
Type
System.Int32

WM_MDIREFRESHMENU

An application sends the WM_MDIREFRESHMENU message to a multiple-document interface (MDI) client window to refresh the window menu of the MDI frame window.

Declaration
public const int WM_MDIREFRESHMENU = 564
Field Value
Type
System.Int32

WM_MDIRESTORE

An application sends the WM_MDIRESTORE message to a multiple-document interface (MDI) client window to restore an MDI child window from maximized or minimized size.

Declaration
public const int WM_MDIRESTORE = 547
Field Value
Type
System.Int32

WM_MDISETMENU

An application sends the WM_MDISETMENU message to a multiple-document interface (MDI) client window to replace the entire menu of an MDI frame window, to replace the window menu of the frame window, or both.

Declaration
public const int WM_MDISETMENU = 560
Field Value
Type
System.Int32

WM_MDITILE

An application sends the WM_MDITILE message to a multiple-document interface (MDI) client window to arrange all of its MDI child windows in a tile format.

Declaration
public const int WM_MDITILE = 550
Field Value
Type
System.Int32

WM_MEASUREITEM

Sent to the owner window of a combo box, list box, list-view control, or menu item when the control or menu is created.

Declaration
public const int WM_MEASUREITEM = 44
Field Value
Type
System.Int32

WM_MENUCHAR

Sent when a menu is active and the user presses a key that does not correspond to any mnemonic or accelerator key. This message is sent to the window that owns the menu.

Declaration
public const int WM_MENUCHAR = 288
Field Value
Type
System.Int32

WM_MENUSELECT

Sent to a menu's owner window when the user selects a menu item.

Declaration
public const int WM_MENUSELECT = 287
Field Value
Type
System.Int32

WM_MOUSEACTIVATE

Sent when the cursor is in an inactive window and the user presses a mouse button. The parent window receives this message only if the child window passes it to the DefWindowProc function.

Declaration
public const int WM_MOUSEACTIVATE = 33
Field Value
Type
System.Int32

WM_MOUSEFIRST

Specify the first mouse message.

Declaration
public const int WM_MOUSEFIRST = 512
Field Value
Type
System.Int32

WM_MOUSEHOVER

Posted to a window when the cursor hovers over the client area of the window for the period of time specified in a prior call to TrackMouseEvent.

Declaration
public const int WM_MOUSEHOVER = 673
Field Value
Type
System.Int32

WM_MOUSELAST

Posted to a window to get the last mouse position.

Declaration
public const int WM_MOUSELAST = 522
Field Value
Type
System.Int32

WM_MOUSELEAVE

Posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.

Declaration
public const int WM_MOUSELEAVE = 675
Field Value
Type
System.Int32

WM_MOUSEMOVE

Posted to a window when the cursor moves. If the mouse is not captured, the message is posted to the window that contains the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_MOUSEMOVE = 512
Field Value
Type
System.Int32

WM_MOUSEWHEEL

Sent to the focus window when the mouse wheel is rotated. The DefWindowProc function propagates the message to the window's parent. There should be no internal forwarding of the message, since DefWindowProc propagates it up the parent chain until it finds a window that processes it.

Declaration
public const int WM_MOUSEWHEEL = 522
Field Value
Type
System.Int32

WM_MOVE

Sent after a window has been moved.

Declaration
public const int WM_MOVE = 3
Field Value
Type
System.Int32

WM_MOVING

Sent while window is in moving.

Declaration
public const int WM_MOVING = 534
Field Value
Type
System.Int32

WM_NCACTIVATE

Sent to a window when its non client area needs to be changed to indicate an active or inactive state.

Declaration
public const int WM_NCACTIVATE = 134
Field Value
Type
System.Int32

WM_NCCALCSIZE

Sent when the size and position of a window's client area must be calculated. By processing this message, an application can control the content of the window's client area when the size or position of the window changes.

Declaration
public const int WM_NCCALCSIZE = 131
Field Value
Type
System.Int32

WM_NCCREATE

Sent prior to the WM_CREATE message when a window is first created.

Declaration
public const int WM_NCCREATE = 129
Field Value
Type
System.Int32

WM_NCDESTROY

Notifies a window that its non client area is being destroyed. The DestroyWindow function sends the WM_NCDESTROY message to the window following the WM_DESTROY message.WM_DESTROY is used to free the allocated memory object associated with the window. The WM_NCDESTROY message is sent after the child windows have been destroyed. In contrast, WM_DESTROY is sent before the child windows are destroyed.

Declaration
public const int WM_NCDESTROY = 130
Field Value
Type
System.Int32

WM_NCHITTEST

Sent to a window in order to determine what part of the window corresponds to a particular screen coordinate. This can happen, for example, when the cursor moves, when a mouse button is pressed or released, or in response to a call to a function such as WindowFromPoint. If the mouse is not captured, the message is sent to the window beneath the cursor. Otherwise, the message is sent to the window that has captured the mouse.

Declaration
public const int WM_NCHITTEST = 132
Field Value
Type
System.Int32

WM_NCLBUTTONDBLCLK

Posted when the user double-clicks the left mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCLBUTTONDBLCLK = 163
Field Value
Type
System.Int32

WM_NCLBUTTONDOWN

Posted when the user presses the left mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCLBUTTONDOWN = 161
Field Value
Type
System.Int32

WM_NCLBUTTONUP

Posted when the user releases the left mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCLBUTTONUP = 162
Field Value
Type
System.Int32

WM_NCMBUTTONDBLCLK

Posted when the user double-clicks the middle mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCMBUTTONDBLCLK = 169
Field Value
Type
System.Int32

WM_NCMBUTTONDOWN

Posted when the user presses the middle mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCMBUTTONDOWN = 167
Field Value
Type
System.Int32

WM_NCMBUTTONUP

Posted when the user releases the middle mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCMBUTTONUP = 168
Field Value
Type
System.Int32

WM_NCMOUSEHOVER

Posted to a window when the cursor hovers over the non-client area of the window for the period of time specified in a prior call to TrackMouseEvent.

Declaration
public const int WM_NCMOUSEHOVER = 672
Field Value
Type
System.Int32

WM_NCMOUSELEAVE

Posted to a window when the cursor leaves the non-client area of the window specified in a prior call to TrackMouseEvent.

Declaration
public const int WM_NCMOUSELEAVE = 674
Field Value
Type
System.Int32

WM_NCMOUSEMOVE

Posted to a window when the cursor is moved within the non-client area of the window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCMOUSEMOVE = 160
Field Value
Type
System.Int32

WM_NCPAINT

Indicates that the frame must need a paint.

Declaration
public const int WM_NCPAINT = 133
Field Value
Type
System.Int32

WM_NCRBUTTONDBLCLK

Posted when the user double-clicks the right mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCRBUTTONDBLCLK = 166
Field Value
Type
System.Int32

WM_NCRBUTTONDOWN

Posted when the user presses the right mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCRBUTTONDOWN = 164
Field Value
Type
System.Int32

WM_NCRBUTTONUP

Posted when the user releases the right mouse button while the cursor is within the non-client area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

Declaration
public const int WM_NCRBUTTONUP = 165
Field Value
Type
System.Int32

WM_NEXTDLGCTL

Sent to a dialog box procedure to set the keyboard focus to a different control in the dialog box.

Declaration
public const int WM_NEXTDLGCTL = 40
Field Value
Type
System.Int32

WM_NEXTMENU

Sent to an application when the right or left arrow key is used to switch between the menu bar and the system menu.

Declaration
public const int WM_NEXTMENU = 531
Field Value
Type
System.Int32

WM_NOTIFY

Sent by a common control to its parent window when an event has occurred or the control requires some information.

Declaration
public const int WM_NOTIFY = 78
Field Value
Type
System.Int32

WM_NOTIFYFORMAT

Determines if a window accepts ANSI or Unicode structures in the WM_NOTIFY notification message. WM_NOTIFYFORMAT messages are sent from a common control to its parent window and from the parent window to the common control.

Declaration
public const int WM_NOTIFYFORMAT = 85
Field Value
Type
System.Int32

WM_NULL

Performs no operation. An application sends the WM_NULL message if it wants to post a message that the recipient window will ignore.

Declaration
public const int WM_NULL = 0
Field Value
Type
System.Int32

WM_PAINT

Indicates the window request for the paint.

Declaration
public const int WM_PAINT = 15
Field Value
Type
System.Int32

WM_PAINTCLIPBOARD

Sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard viewer's client area needs repainting.

Declaration
public const int WM_PAINTCLIPBOARD = 777
Field Value
Type
System.Int32

WM_PAINTICON

The WM_PAINTICON message is sent to a minimized window when the icon is to be painted but only if the application is written for Windows 3.x. A window receives this message only if a class icon is defined for the window; otherwise, WM_PAINT is sent instead.

Declaration
public const int WM_PAINTICON = 38
Field Value
Type
System.Int32

WM_PALETTECHANGED

The WM_PALETTECHANGED message is sent to all top-level and overlapped windows after the window with the keyboard focus has realized its logical palette, thereby changing the system palette. This message enables a window that uses a color palette but does not have the keyboard focus to realize its logical palette and update its client area.

Declaration
public const int WM_PALETTECHANGED = 785
Field Value
Type
System.Int32

WM_PALETTEISCHANGING

The WM_PALETTEISCHANGING message informs applications that an application is going to realize its logical palette.

Declaration
public const int WM_PALETTEISCHANGING = 784
Field Value
Type
System.Int32

WM_PARENTNOTIFY

Sent to a window when a significant action occurs on a descendant window. This message is now extended to include the WM_POINTERDOWN event. When the child window is being created, the system sends WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the window returns. When the child window is being destroyed, the system sends the message before any processing to destroy the window takes place.

Declaration
public const int WM_PARENTNOTIFY = 528
Field Value
Type
System.Int32

WM_PASTE

An application sends a WM_PASTE message to an edit control or combo box to copy the current content of the clipboard to the edit control at the current caret position. Data is inserted only if the clipboard contains data in CF_TEXT format.

Declaration
public const int WM_PASTE = 770
Field Value
Type
System.Int32

WM_PENWINFIRST

The pend that creates first for the drawing.

Declaration
public const int WM_PENWINFIRST = 896
Field Value
Type
System.Int32

WM_PENWINLAST

The pend that creates last for the drawing.

Declaration
public const int WM_PENWINLAST = 911
Field Value
Type
System.Int32

WM_POWER

Notifies applications that the system, typically a battery-powered personal computer, is about to enter a suspended mode.

Declaration
public const int WM_POWER = 72
Field Value
Type
System.Int32

WM_POWERBROADCAST

Notifies applications that a power-management event has occurred.

Declaration
public const int WM_POWERBROADCAST = 536
Field Value
Type
System.Int32

WM_PRINT

The WM_PRINT message is sent to a window to request that it draw itself in the specified device context, most commonly in a printer device context.

Declaration
public const int WM_PRINT = 791
Field Value
Type
System.Int32

WM_PRINTCLIENT

The WM_PRINTCLIENT message is sent to a window to request that it draw its client area in the specified device context, most commonly in a printer device context. Unlike WM_PRINT, WM_PRINTCLIENT is not processed by DefWindowProc. A window should process the WM_PRINTCLIENT message through an application-defined WindowProc function for it to be used properly.

Declaration
public const int WM_PRINTCLIENT = 792
Field Value
Type
System.Int32

WM_PSD_ENVSTAMPRECT

Notifies the hook procedure of a Page Setup dialog box, PagePaintHook, that the dialog box is about to draw the envelope-stamp rectangle of the sample page.

Declaration
public const int WM_PSD_ENVSTAMPRECT = 1029
Field Value
Type
System.Int32

WM_PSD_FULLPAGERECT

Notifies a PagePaintHook hook procedure of the coordinates of the sample page rectangle in the Page Setup dialog box. The dialog box sends this message when it is about to draw the contents of the sample page.

Declaration
public const int WM_PSD_FULLPAGERECT = 1025
Field Value
Type
System.Int32

WM_PSD_GREEKTEXTRECT

Notifies the hook procedure of a Page Setup dialog box, PagePaintHook, that the dialog box is about to draw Greek text inside the margin rectangle of the sample page.

Declaration
public const int WM_PSD_GREEKTEXTRECT = 1028
Field Value
Type
System.Int32

WM_PSD_MARGINRECT

Notifies the hook procedure of a Page Setup dialog box, PagePaintHook, that the dialog box is about to draw the margin rectangle of the sample page.

Declaration
public const int WM_PSD_MARGINRECT = 1027
Field Value
Type
System.Int32

WM_PSD_MINMARGINRECT

Notifies a PagePaintHook hook procedure of the coordinates of the margin rectangle in the sample page. A Page Setup dialog box sends this message when it is about to draw the contents of the sample page.

Declaration
public const int WM_PSD_MINMARGINRECT = 1026
Field Value
Type
System.Int32

WM_PSD_PAGESETUPDLG

Notifies a PagePaintHook hook procedure that the Page Setup dialog box is about to draw the contents of the sample page. The hook procedure can use this message to carry out initialization tasks related to drawing the contents of the sample page.

Declaration
public const int WM_PSD_PAGESETUPDLG = 1024
Field Value
Type
System.Int32

WM_PSD_YAFULLPAGERECT

Notifies the hook procedure of a Page Setup dialog box, PagePaintHook, that the dialog box is about to draw the return address portion of an envelope sample page.

Declaration
public const int WM_PSD_YAFULLPAGERECT = 1030
Field Value
Type
System.Int32

WM_QUERYDRAGICON

Sent to a minimized (iconic) window. The window is about to be dragged by the user but does not have an icon defined for its class. An application can return a handle to an icon or cursor. The system displays this cursor or icon while the user drags the icon.

Declaration
public const int WM_QUERYDRAGICON = 55
Field Value
Type
System.Int32

WM_QUERYENDSESSION

The WM_QUERYENDSESSION message is sent when the user chooses to end the session or when an application calls one of the system shutdown functions. If any application returns zero, the session is not ended. The system stops sending WM_QUERYENDSESSION messages as soon as one application returns zero. After processing this message, the system sends the WM_ENDSESSION message with the wParam parameter set to the results of the WM_QUERYENDSESSION message.

Declaration
public const int WM_QUERYENDSESSION = 17
Field Value
Type
System.Int32

WM_QUERYNEWPALETTE

The WM_QUERYNEWPALETTE message informs a window that it is about to receive the keyboard focus, giving the window the opportunity to realize its logical palette when it receives the focus.

Declaration
public const int WM_QUERYNEWPALETTE = 783
Field Value
Type
System.Int32

WM_QUERYOPEN

Sent to an icon when the user requests that the window be restored to its previous size and position.

Declaration
public const int WM_QUERYOPEN = 19
Field Value
Type
System.Int32

WM_QUERYUISTATE

An application sends the WM_QUERYUISTATE message to retrieve the UI state for a window.

Declaration
public const int WM_QUERYUISTATE = 297
Field Value
Type
System.Int32

WM_QUEUESYNC

Sent by a computer-based training (CBT) application to separate user-input messages from other messages sent through the WH_JOURNALPLAYBACK procedure.

Declaration
public const int WM_QUEUESYNC = 35
Field Value
Type
System.Int32

WM_QUIT

Indicates a request to terminate an application, and is generated when the application calls the PostQuitMessage function. This message causes the GetMessage function to return zero.

Declaration
public const int WM_QUIT = 18
Field Value
Type
System.Int32

WM_RBUTTONDBLCLK

Posted when the user double-clicks the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_RBUTTONDBLCLK = 518
Field Value
Type
System.Int32

WM_RBUTTONDOWN

Posted when the user presses the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_RBUTTONDOWN = 516
Field Value
Type
System.Int32

WM_RBUTTONUP

Posted when the user releases the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

Declaration
public const int WM_RBUTTONUP = 517
Field Value
Type
System.Int32

WM_REFLECT

Represents the reflect window message.

Declaration
public const int WM_REFLECT = 8192
Field Value
Type
System.Int32

WM_RENDERALLFORMATS

Sent to the clipboard owner before it is destroyed, if the clipboard owner has delayed rendering one or more clipboard formats. For the content of the clipboard to remain available to other applications, the clipboard owner must render data in all the formats it is capable of generating, and place the data on the clipboard by calling the SetClipboardData function.

Declaration
public const int WM_RENDERALLFORMATS = 774
Field Value
Type
System.Int32

WM_RENDERFORMAT

Sent to the clipboard owner if it has delayed rendering a specific clipboard format and if an application has requested data in that format. The clipboard owner must render data in the specified format and place it on the clipboard by calling the SetClipboardData function.

Declaration
public const int WM_RENDERFORMAT = 773
Field Value
Type
System.Int32

WM_SETCURSOR

Sent to a window if the mouse causes the cursor to move within a window and mouse input is not captured.

Declaration
public const int WM_SETCURSOR = 32
Field Value
Type
System.Int32

WM_SETFOCUS

Sent to a window after it has gained the keyboard focus.

Declaration
public const int WM_SETFOCUS = 7
Field Value
Type
System.Int32

WM_SETFONT

Sets the font that a control is to use when drawing text.

Declaration
public const int WM_SETFONT = 48
Field Value
Type
System.Int32

WM_SETHOTKEY

Sent to a window to associate a hot key with the window. When the user presses the hot key, the system activates the window.

Declaration
public const int WM_SETHOTKEY = 50
Field Value
Type
System.Int32

WM_SETICON

Associates a new large or small icon with a window. The system displays the large icon in the ALT+TAB dialog box, and the small icon in the window caption.

Declaration
public const int WM_SETICON = 128
Field Value
Type
System.Int32

WM_SETREDRAW

Indicates the window requests to the redrawn.

Declaration
public const int WM_SETREDRAW = 11
Field Value
Type
System.Int32

WM_SETTEXT

Sets the text of a window.

Declaration
public const int WM_SETTEXT = 12
Field Value
Type
System.Int32

WM_SETTINGCHANGE

A message that is sent to all top-level windows when the SystemParametersInfo function changes a system-wide setting or when policy settings have changed.

Declaration
public const int WM_SETTINGCHANGE = 26
Field Value
Type
System.Int32

WM_SHOWWINDOW

Sent to a window when the window is about to be hidden or shown.

Declaration
public const int WM_SHOWWINDOW = 24
Field Value
Type
System.Int32

WM_SIZE

Sent to a window after its size has changed.

Declaration
public const int WM_SIZE = 5
Field Value
Type
System.Int32

WM_SIZECLIPBOARD

Sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard viewer's client area has changed size.

Declaration
public const int WM_SIZECLIPBOARD = 779
Field Value
Type
System.Int32

WM_SIZING

Sent to a window that the user is resizing. By processing this message, an application can monitor the size and position of the drag rectangle and, if needed, change its size or position.

Declaration
public const int WM_SIZING = 532
Field Value
Type
System.Int32

WM_SPOOLERSTATUS

The WM_SPOOLERSTATUS message is sent from Print Manager whenever a job is added to or removed from the Print Manager queue.

Declaration
public const int WM_SPOOLERSTATUS = 42
Field Value
Type
System.Int32

WM_STYLECHANGED

Sent to a window after the SetWindowLong function has changed one or more of the window's styles.

Declaration
public const int WM_STYLECHANGED = 125
Field Value
Type
System.Int32

WM_STYLECHANGING

Sent to a window when the SetWindowLong function is about to change one or more of the window's styles.

Declaration
public const int WM_STYLECHANGING = 124
Field Value
Type
System.Int32

WM_SYSCHAR

Posted to the window with the keyboard focus when a WM_SYSKEYDOWN message is translated by the TranslateMessage function. It specifies the character code of a system character key — that is, a character key that is pressed while the ALT key is down.

Declaration
public const int WM_SYSCHAR = 262
Field Value
Type
System.Int32

WM_SYSCOLORCHANGE

The WM_SYSCOLORCHANGE message is sent to all top-level windows when a change is made to a system color setting.

Declaration
public const int WM_SYSCOLORCHANGE = 21
Field Value
Type
System.Int32

WM_SYSCOMMAND

A window receives this message when the user chooses a command from the Window menu (formerly known as the system or control menu) or when the user chooses the maximize button, minimize button, restore button, or close button.

Declaration
public const int WM_SYSCOMMAND = 274
Field Value
Type
System.Int32

WM_SYSDEADCHAR

Sent to the window with the keyboard focus when a WM_SYSKEYDOWN message is translated by the TranslateMessage function. WM_SYSDEADCHAR specifies the character code of a system dead key — that is, a dead key that is pressed while holding down the ALT key.

Declaration
public const int WM_SYSDEADCHAR = 263
Field Value
Type
System.Int32

WM_SYSKEYDOWN

Posted to the window with the keyboard focus when the user presses the F10 key (which activates the menu bar) or holds down the ALT key and then presses another key. It also occurs when no window currently has the keyboard focus; in this case, the WM_SYSKEYDOWN message is sent to the active window. The window that receives the message can distinguish between these two contexts by checking the context code in the lParam parameter.

Declaration
public const int WM_SYSKEYDOWN = 260
Field Value
Type
System.Int32

WM_SYSKEYUP

Posted to the window with the keyboard focus when the user releases a key that was pressed while the ALT key was held down. It also occurs when no window currently has the keyboard focus; in this case, the WM_SYSKEYUP message is sent to the active window. The window that receives the message can distinguish between these two contexts by checking the context code in the lParam parameter.

Declaration
public const int WM_SYSKEYUP = 261
Field Value
Type
System.Int32

WM_TCARD

Sent to an application that has initiated a training card with Windows Help. The message informs the application when the user clicks an authorable button. An application initiates a training card by specifying the HELP_TCARD command in a call to the WinHelp function.

Declaration
public const int WM_TCARD = 82
Field Value
Type
System.Int32

WM_TIMECHANGE

A message that is sent whenever there is a change in the system time.

Declaration
public const int WM_TIMECHANGE = 30
Field Value
Type
System.Int32

WM_TIMER

Posted to the installing thread's message queue when a timer expires. The message is posted by the GetMessage or PeekMessage function.

Declaration
public const int WM_TIMER = 275
Field Value
Type
System.Int32

WM_UNDO

An application sends a WM_UNDO message to an edit control to undo the last operation. When this message is sent to an edit control, the previously deleted text is restored or the previously added text is deleted.

Declaration
public const int WM_UNDO = 772
Field Value
Type
System.Int32

WM_UPDATEUISTATE

An application sends the WM_UPDATEUISTATE message to change the UI state for the specified window and all its child windows.

Declaration
public const int WM_UPDATEUISTATE = 296
Field Value
Type
System.Int32

WM_USER

Used to define private messages for use by private window classes, usually of the form WM_USER+x, where x is an integer value.

Declaration
public const int WM_USER = 1024
Field Value
Type
System.Int32

WM_USERCHANGED

Sent to all windows after the user has logged on or off. When the user logs on or off, the system updates the user-specific settings. The system sends this message immediately after updating the settings.

Declaration
public const int WM_USERCHANGED = 84
Field Value
Type
System.Int32

WM_VKEYTOITEM

Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a WM_KEYDOWN message.

Declaration
public const int WM_VKEYTOITEM = 46
Field Value
Type
System.Int32

WM_VSCROLL

Occurs when the window scroll event is occur on the vertical scrollbar.

Declaration
public const int WM_VSCROLL = 277
Field Value
Type
System.Int32

WM_VSCROLLCLIPBOARD

Sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and an event occurs in the clipboard viewer's vertical scroll bar. The owner should scroll the clipboard image and update the scroll bar values.

Declaration
public const int WM_VSCROLLCLIPBOARD = 778
Field Value
Type
System.Int32

WM_WINDOWPOSCHANGED

Sent to a window whose size, position, or place in the Z order has changed as a result of a call to the SetWindowPos function or another window-management function.

Declaration
public const int WM_WINDOWPOSCHANGED = 71
Field Value
Type
System.Int32

WM_WINDOWPOSCHANGING

Sent to a window whose size, position, or place in the Z order is about to change as a result of a call to the SetWindowPos function or another window-management function.

Declaration
public const int WM_WINDOWPOSCHANGING = 70
Field Value
Type
System.Int32

WM_WININICHANGE

An application sends the WM_WININICHANGE message to all top-level windows after making a change to the WIN.INI file. The SystemParametersInfo function sends this message after an application uses the function to change a setting in WIN.INI.

Declaration
public const int WM_WININICHANGE = 26
Field Value
Type
System.Int32

WS_BORDER

The window has a thin-line border.

Declaration
public const int WS_BORDER = 8388608
Field Value
Type
System.Int32

WS_CAPTION

The window has a title bar (includes the WS_BORDER style).

Declaration
public const int WS_CAPTION = 12582912
Field Value
Type
System.Int32

WS_CHILD

The window is a child window. A window with this style cannot have a menu bar. This style cannot be used with the WS_POPUP style.

Declaration
public const int WS_CHILD = 1073741824
Field Value
Type
System.Int32

WS_CLIPCHILDREN

Excludes the area occupied by child windows when drawing occurs within the parent window. This style is used when creating the parent window.

Declaration
public const int WS_CLIPCHILDREN = 33554432
Field Value
Type
System.Int32

WS_CLIPSIBLINGS

Clips child windows relative to each other; that is, when a particular child window receives a WM_PAINT message, the WS_CLIPSIBLINGS style clips all other overlapping child windows out of the region of the child window to be updated. If WS_CLIPSIBLINGS is not specified and child windows overlap, it is possible, when drawing within the client area of a child window, to draw within the client area of a neighboring child window.

Declaration
public const int WS_CLIPSIBLINGS = 67108864
Field Value
Type
System.Int32

WS_DISABLED

The window is initially disabled. A disabled window cannot receive input from the user. To change this after a window has been created, use the EnableWindow function.

Declaration
public const int WS_DISABLED = 134217728
Field Value
Type
System.Int32

WS_DLGFRAME

The window has a border of a style typically used with dialog boxes. A window with this style cannot have a title bar.

Declaration
public const int WS_DLGFRAME = 4194304
Field Value
Type
System.Int32

WS_EX_APPWINDOW

Forces a top-level window onto the task-bar when the window is visible.

Declaration
public const int WS_EX_APPWINDOW = 262144
Field Value
Type
System.Int32

WS_EX_CLIENTEDGE

The window has a border with a sunken edge.

Declaration
public const int WS_EX_CLIENTEDGE = 512
Field Value
Type
System.Int32

WS_EX_CONTEXTHELP

The title bar of the window includes a question mark. When the user clicks the question mark, the cursor changes to a question mark with a pointer. If the user then clicks a child window, the child receives a WM_HELP message. The child window should pass the message to the parent window procedure, which should call the WinHelp function using the HELP_WM_HELP command. The Help application displays a pop-up window that typically contains help for the child window. WS_EX_CONTEXTHELP cannot be used with the WS_MAXIMIZEBOX or WS_MINIMIZEBOX styles.

Declaration
public const int WS_EX_CONTEXTHELP = 1024
Field Value
Type
System.Int32

WS_EX_CONTROLPARENT

The window itself contains child windows that should take part in dialog box navigation. If this style is specified, the dialog manager recursive into children of this window when performing navigation operations such as handling the TAB key, an arrow key, or a keyboard mnemonic.

Declaration
public const int WS_EX_CONTROLPARENT = 65536
Field Value
Type
System.Int32

WS_EX_DLGMODALFRAME

The window has a double border; the window can, optionally, be created with a title bar by specifying the WS_CAPTION style in the dwStyle parameter.

Declaration
public const int WS_EX_DLGMODALFRAME = 1
Field Value
Type
System.Int32

WS_EX_LAYERED

The window is a layered window. This style cannot be used if the window has a class style of either CS_OWNDC or CS_CLASSDC.

Declaration
public const int WS_EX_LAYERED = 524288
Field Value
Type
System.Int32

WS_EX_LAYOUTRTL

If the shell language is Hebrew, Arabic, or another language that supports reading order alignment, the horizontal origin of the window is on the right edge. Increasing horizontal values advance to the left.

Declaration
public const int WS_EX_LAYOUTRTL = 4194304
Field Value
Type
System.Int32

WS_EX_LEFT

The window has generic left-aligned properties. This is the default.

Declaration
public const int WS_EX_LEFT = 0
Field Value
Type
System.Int32

WS_EX_LEFTSCROLLBAR

If the shell language is Hebrew, Arabic, or another language that supports reading order alignment, the vertical scroll bar (if present) is to the left of the client area. For other languages, the style is ignored.

Declaration
public const int WS_EX_LEFTSCROLLBAR = 16384
Field Value
Type
System.Int32

WS_EX_MDICHILD

The window is a MDI child window.

Declaration
public const int WS_EX_MDICHILD = 64
Field Value
Type
System.Int32

WS_EX_NOINHERITLAYOUT

The window has a border with a raised edge.

Declaration
public const int WS_EX_NOINHERITLAYOUT = 1048576
Field Value
Type
System.Int32

WS_EX_RIGHT

The window has generic "right-aligned" properties. This depends on the window class. This style has an effect only if the shell language is Hebrew, Arabic, or another language that supports reading-order alignment; otherwise, the style is ignored.

Declaration
public const int WS_EX_RIGHT = 4096
Field Value
Type
System.Int32

WS_EX_RTLREADING

If the shell language is Hebrew, Arabic, or another language that supports reading-order alignment, the window text is displayed using right-to-left reading-order properties. For other languages, the style is ignored.

Declaration
public const int WS_EX_RTLREADING = 8192
Field Value
Type
System.Int32

WS_EX_STATICEDGE

The window has a three-dimensional border style intended to be used for items that do not accept user input.

Declaration
public const int WS_EX_STATICEDGE = 131072
Field Value
Type
System.Int32

WS_EX_TOOLWINDOW

The window is intended to be used as a floating toolbar. A tool window has a title bar that is shorter than a normal title bar, and the window title is drawn using a smaller font. A tool window does not appear in the taskbar or in the dialog that appears when the user presses ALT+TAB. If a tool window has a system menu, its icon is not displayed on the title bar. However, you can display the system menu by right-clicking or by typing ALT+SPACE.

Declaration
public const int WS_EX_TOOLWINDOW = 128
Field Value
Type
System.Int32

WS_EX_TOPMOST

The window should be placed above all non-topmost windows and should stay above them, even when the window is deactivated. To add or remove this style, use the SetWindowPos function.

Declaration
public const int WS_EX_TOPMOST = 8
Field Value
Type
System.Int32

WS_EX_WINDOWEDGE

The window has a border with a raised edge.

Declaration
public const int WS_EX_WINDOWEDGE = 256
Field Value
Type
System.Int32

WS_HSCROLL

The window has a horizontal scroll bar.

Declaration
public const int WS_HSCROLL = 1048576
Field Value
Type
System.Int32

WS_MAXIMIZE

The window is initially maximized.

Declaration
public const int WS_MAXIMIZE = 16777216
Field Value
Type
System.Int32

WS_MAXIMIZEBOX

The window has a maximize button. Cannot be combined with the WS_EX_CONTEXTHELP style. The WS_SYSMENU style must also be specified.

Declaration
public const int WS_MAXIMIZEBOX = 65536
Field Value
Type
System.Int32

WS_MINIMIZE

The window is initially minimized. Same as the WS_ICONIC style.

Declaration
public const int WS_MINIMIZE = 536870912
Field Value
Type
System.Int32

WS_MINIMIZEBOX

The window has a minimize button. Cannot be combined with the WS_EX_CONTEXTHELP style. The WS_SYSMENU style must also be specified.

Declaration
public const int WS_MINIMIZEBOX = 131072
Field Value
Type
System.Int32

WS_OVERLAPPED

The window is an overlapped window. An overlapped window has a title bar and a border. Same as the WS_TILED style.

Declaration
public const int WS_OVERLAPPED = 0
Field Value
Type
System.Int32

WS_POPUP

The windows is a pop-up window. This style cannot be used with the WS_CHILD style.

Declaration
public const int WS_POPUP = -2147483648
Field Value
Type
System.Int32

WS_SYSMENU

The window has a window menu on its title bar. The WS_CAPTION style must also be specified.

Declaration
public const int WS_SYSMENU = 524288
Field Value
Type
System.Int32

WS_TABSTOP

The window is a control that can receive the keyboard focus when the user presses the TAB key. Pressing the TAB key changes the keyboard focus to the next control with the WS_TABSTOP style.

Declaration
public const int WS_TABSTOP = 65536
Field Value
Type
System.Int32

WS_THICKFRAME

The window has a sizing border. Same as the WS_SIZEBOX style.

Declaration
public const int WS_THICKFRAME = 262144
Field Value
Type
System.Int32

WS_VISIBLE

The window is initially visible. This style can be turned on and off by using the ShowWindow or SetWindowPos function.

Declaration
public const int WS_VISIBLE = 268435456
Field Value
Type
System.Int32

WS_VSCROLL

The window has a vertical scroll bar.

Declaration
public const int WS_VSCROLL = 2097152
Field Value
Type
System.Int32