Convert PowerPoint Presentation to Image in Azure App Service on Linux

8 Nov 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.