How to convert a PowerPoint presentation file to metafile image [EMF] in WinForms?

Syncfusion Essential Presentation is a .NET PowerPoint Library used to create, open, read, edit, and export PowerPoint presentations. Using this library, you can export a PowerPoint presentation slides as EMF images in C# and VB.NET. Exporting the PowerPoint slides as EMF images will result good quality images.

Steps to convert a PowerPoint presentation file to metafile images programmatically:

1. Create a new C# console application.

2. Install Syncfusion.Presentation.Base NuGet package to the console application project from nuget.org. For more information about adding a NuGet feed in Visual Studio and installing NuGet packages, refer to documentation.

3. Install Syncfusion.OfficeChartToImageConverter.Wpf NuGet package to the console application project from nuget.org. For more information about adding a NuGet feed in Visual Studio and installing NuGet packages, refer to documentation.

4. Include the following namespace in the Program.cs file.

   using Syncfusion.Presentation;
   using Syncfusion.OfficeChartToImageConverter;
   

Imports Syncfusion.Presentation
Imports Syncfusion.OfficeChartToImageConverter

5. Use the following code snippet to convert the slides in the PowerPoint presentation as .emf images.

   //Open the PowerPoint Presentation.
   IPresentation powerpointDoc = Presentation.Open("Sample.pptx");
    
   //Create an instance of ChartToImageConverter and assign it to ChartToImageConverter property of presentation.
   powerpointDoc.ChartToImageConverter = new ChartToImageConverter();
    
   //Iterate the slides in the PowerPoint file and convert to image
   foreach (ISlide slide in powerpointDoc.Slides)
   {
       //Convert the slide as EMF image stream.
       System.IO.Stream emfImgStream = slide.ConvertToImage(Syncfusion.Drawing.ImageFormat.Emf);
    
       //Create a FileStream object to write the EMF image stream to a file
       using (System.IO.FileStream fileStream = System.IO.File.Create("Slide_" + slide.SlideNumber + ".emf", (int)emfImgStream.Length))
       {
           //Fill the bytes array with the EMF stream data
           byte[] bytesInStream = new byte[emfImgStream.Length];
    
           //Copy the EMF image stream to FileStream
           emfImgStream.Read(bytesInStream, 0, (int)bytesInStream.Length);
    
           //Write the EMF image to the specified file
           fileStream.Write(bytesInStream, 0, bytesInStream.Length);
       }
   }
    
   //Close the Presentation.
   powerpointDoc.Close();
   

'Open the PowerPoint Presentation.
Dim powerpointDoc As IPresentation = Presentation.Open("Sample.pptx")
 
'Create an instance of ChartToImageConverter and assign it to ChartToImageConverter property of presentation.
powerpointDoc.ChartToImageConverter = New ChartToImageConverter()
 
'Iterate the slides in the PowerPoint file and convert to image
For Each slide As ISlide In powerpointDoc.Slides
    'Convert the slide as EMF image stream.
    Dim emfImgStream As System.IO.Stream = slide.ConvertToImage(Syncfusion.Drawing.ImageFormat.Emf)
 
    'Create a FileStream object to write the EMF image stream to a file
    Using fileStream As System.IO.FileStream = System.IO.File.Create("Slide_" + slide.SlideNumber + ".emf", CInt(emfImgStream.Length))
        'Fill the bytes array with the EMF stream data
        Dim bytesInStream As Byte() = New Byte(emfImgStream.Length - 1) {}
 
        'Copy the EMF image stream to FileStream
        emfImgStream.Read(bytesInStream, 0, CInt(bytesInStream.Length))
 
        'Write the EMF image to the specified file
        fileStream.Write(bytesInStream, 0, bytesInStream.Length)
    End Using
Next
 
'Close the Presentation.
powerpointDoc.Close()

You can download the working sample from Convert-PowerPoint-To-EMF-Images.Zip.

An online sample link to convert a PowerPoint presentation slides as images. Take a moment to peruse the documentation, where you can find mode details about exporting the PowerPoint slides as images with code examples. Refer here to explore the complete set of Syncfusion Essential Presentation features.