Convert PowerPoint Presentation to Image in Azure App Service on Linux

2 Dec 202411 minutes to read

Syncfusion® PowerPoint is a .NET Core PowerPoint library used to create, read, edit and convert PowerPoint documents programmatically without Microsoft PowerPoint or interop dependencies. Using this library, you can convert a PowerPoint Presentation to image in Azure App Service on Linux.

Steps to convert PowerPoint Presentation to Image in Azure App Service on Linux

Step 1: Create a new ASP.NET Core Web App (Model-View-Controller).

Step 2: Create a project name and select the location.

Step 3: Click Create button.

Step 4: Install the following Nuget packages in your application from Nuget.org.

• Syncfusion.PresentationRenderer.Net.Core
• SkiaSharp.NativeAssets.Linux v2.88.8
• HarfBuzzSharp.NativeAssets.Linux v7.3.0.2

NOTE

Starting with v16.2.0.x, if you reference Syncfusion® assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering Syncfusion® license key in your application to use our components.

Step 5: Add a new button in the Index.cshtml as shown below.

C#

@{
    Html.BeginForm("ConvertPPTXtoImage", "Home", FormMethod.Post, new { enctype = "multipart/form-data" });
    {
        <div class="Common">
            <div class="tablediv">
                <div class="rowdiv">
                    This sample illustrates how to convert PowerPoint document to image using PowerPoint library.
                </div>
                &nbsp;
                <div class="rowdiv" style="border-width: 0.5px;border-style:solid; border-color: lightgray; padding: 1px 5px 7px 5px">
                    Click the button to view the resultant image document being converted from PowerPoint document.
                    <div class="rowdiv" style="margin-top: 10px">
                        <div class="celldiv">
                            Select Document :
                            @Html.TextBox("file", "", new { type = "file", accept = ".pptx" }) <br />
                        </div>
                        <div class="rowdiv" style="margin-top: 8px">
                            <input class="buttonStyle" type="submit" value="Convert to image" name="button" style="width:150px;height:27px" />
                            <br />
                            <div class="text-danger">
                                @ViewBag.Message
                            </div>
                        </div>
                    </div>
                </div>
                <br />
            </div>
        </div>
        Html.EndForm();
    }
}

Step 6: Include the following namespaces in HomeController.cs.

C#

using Syncfusion.Presentation;
using Syncfusion.PresentationRenderer;

Step 9: Include the below code snippet in HomeController.cs for convert a PowerPoint Presentation to image.

C#

private Microsoft.AspNetCore.Hosting.IHostingEnvironment _env;
public HomeController(Microsoft.AspNetCore.Hosting.IHostingEnvironment env)
{
    _env = env;
}

/// <summary>
/// Convert Presentation to image
/// </summary>
/// <param name="button"></param>
/// <returns></returns>
public ActionResult ConvertPPTXtoImage(string button)
{
    if (button == null)
        return View("Index");
    if (Request.Form.Files != null)
    {
        if (Request.Form.Files.Count == 0)
        {
            ViewBag.Message = string.Format("Browse a PowerPoint Presentation and then click the button to convert as a image");
            return View("Index");
        }
        // Gets the extension from file.
        string extension = Path.GetExtension(Request.Form.Files[0].FileName).ToLower();
        // Compares extension with supported extensions.
        if (extension == ".pptx")
        {
            MemoryStream memoryStream = new MemoryStream();
            Request.Form.Files[0].CopyTo(memoryStream);
            try
            {
                //Open the existing PowerPoint presentation with loaded stream.
                using (IPresentation pptxDoc = Presentation.Open(memoryStream))
                {
                    //Initialize the PresentationRenderer to perform image conversion.
                    pptxDoc.PresentationRenderer = new PresentationRenderer();
                    //Convert PowerPoint slide to image as stream.
                    Stream stream = pptxDoc.Slides[0].ConvertToImage(ExportImageFormat.Jpeg);
                    //Reset the stream position
                    stream.Position = 0;
                    //Download image in the browser.
                    return File(stream, "application/jpeg", "PPTXtoImage.Jpeg");                                
                }
            }
            catch (Exception ex)
            {
                ViewBag.Message = ex.ToString();
            }
        }
        else
        {
            ViewBag.Message = string.Format("Please choose PowerPoint document to convert to image");
        }
    }
    else
    {
        ViewBag.Message = string.Format("Browse a PowerPoint document and then click the button to convert as a image");
    }
    return View("Index");
}

Steps to publish as Azure App Service on Linux

Step 1: Right-click the project and select Publish option.

Step 2: Click the Add a Publish Profile button.

Step 3: Select the publish target as Azure.

Step 4: Select the Specific target as Azure App Service (Linux).

Step 5: To create a new app service, click Create new option.

Step 6: Click the Create button to proceed with App Service creation.

Step 7: Click the Finish button to finalize the App Service creation.

Step 8: Click Close button.

Step 9: Click the Publish button.

Step 10: Now, Publish has been succeeded.

Step 11: Now, the published webpage will open in the browser.

Step 12: Select the PowerPoint Presentation and Click Convert to Image to convert the given PowerPoint Presentation to image.You will get the output image document as follows.

You can download a complete working sample from GitHub.

Click here to explore the rich set of Syncfusion® PowerPoint Library (Presentation) features.

An online sample link to convert PowerPoint Presentation to image in ASP.NET Core.