PPTX: Render pages of PPTX document

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Here is C#/VB.NET code that shows how to open PPTX document using PptxDecoder class, render all pages of PPTX document and save rendered images to the PNG files:

/// <summary>
/// Converts pages of PPTX document to PNG files.
/// </summary>
public static void ConvertPptxToPng(string pptxFileName)
{
    // specify that VintaSoft Imaging .NET SDK should use GDI+ for drawing of 2D graphics
    Vintasoft.Imaging.Drawing.Gdi.GdiGraphicsFactory.SetAsDefault();
    // specify that VintaSoft Imaging .NET SDK should use SkiaSharp for drawing of 2D graphics
    //Vintasoft.Imaging.Drawing.SkiaSharp.SkiaSharpDrawingFactory.SetAsDefault();

    // create image collection
    using (Vintasoft.Imaging.ImageCollection images = new Vintasoft.Imaging.ImageCollection())
    {
        // add PPTX document to the image collection
        images.Add(pptxFileName);

        // create PNG encoder
        using (Vintasoft.Imaging.Codecs.Encoders.PngEncoder pngEncoder =
            new Vintasoft.Imaging.Codecs.Encoders.PngEncoder())
        {
            // for each page in PPTX document
            for (int i = 0; i < images.Count; i++)
            {
                // save rendered image to a PNG file
                images[i].Save(string.Format("page{0}.png", i), pngEncoder);
            }
        }

        // dispose images
        images.ClearAndDisposeItems();
    }
}

VB.NET

''' <summary>
''' Converts pages of PPTX document to PNG files.
''' </summary>
Public Shared Sub ConvertPptxToPng(pptxFileName As String)
    ' specify that VintaSoft Imaging .NET SDK should use GDI+ for drawing of 2D graphics
    Vintasoft.Imaging.Drawing.Gdi.GdiGraphicsFactory.SetAsDefault()
    ' specify that VintaSoft Imaging .NET SDK should use SkiaSharp for drawing of 2D graphics
    'Vintasoft.Imaging.Drawing.SkiaSharp.SkiaSharpDrawingFactory.SetAsDefault()

    ' create image collection
    Using images As New Vintasoft.Imaging.ImageCollection()
        ' add PPTX document to the image collection
        images.Add(pptxFileName)

        ' create PNG encoder
        Using pngEncoder As New Vintasoft.Imaging.Codecs.Encoders.PngEncoder()
            ' for each page in PPTX document
            For i As Integer = 0 To images.Count - 1
                ' save rendered image to a PNG file
                images(i).Save(String.Format("page{0}.png", i), pngEncoder)
            Next
        End Using

        ' dispose images
        images.ClearAndDisposeItems()
    End Using
End Sub

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