Saving Slide to PNG Using Aspose.Slides for .NET on Linux Results in Exception

Aspose.Slides Product Family
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1

Good morning Aspose team,
Having the issue with last update of Aspose.Slides 23.6 when asking for Png for whole slide:

after doing this:

using var bitmap = slide.GetThumbnail(scaleFactor, scaleFactor);
var ms = new MemoryStream();
bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png); // this throws exception now

Seeing this exception on Linux (Windows works fine):
System.Drawing.Common is not supported on this platform.

How can I avoid this.

Since earlier version of Aspose.Slides (23.3) we have enabled System.Drawing.EnableUnixSupport
and also installed SkiaSharp - but it seems not to help any more:

Thanks for answer.

Best regards
Pavel

2

@ottap,
Thank you for describing the issue.

Please share the following additional files and information:

  • input presentation file
  • Linux version on which the error occurs
  • .NET target platform in your app
  • full stacktrace of the exception
3

Dear Aspose,
sending simple console application which throws mentioned exception:
System.PlatformNotSupportedException: 'System.Drawing.Common is not supported on this platform.'

I am running Linux distribution of Ubuntu 18.04

Here is how it behaves with latest update (23.6)
Bug415735_SystemDrawingCommonException.zip (250.6 KB)

FYI for two different settings in csproj - first will work, second not:

<PackageReference Include="Aspose.Slides.NET" Version="23.5.0" /> // this works
<PackageReference Include="Aspose.Slides.NET" Version="23.6.0" /> // this fails

Code fails:

public void Convert()
{
    //Instantiate a Presentation class that represents the presentation file
    var file = Path.Combine("Files","Presentation.pptx");
            
    using Presentation pres = new Presentation(file);

    ISlide sld = pres.Slides[0];
    var shape = sld.Shapes[0];

    //Create a memory stream object
    MemoryStream svgStream = new MemoryStream();
    
    //Generate SVG image of slide and save in memory stream
    **shape.WriteAsSvg(svgStream);** // This throws exception

Thanks in advance

4

@ottap,
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): SLIDESNET-44085

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.

5

Thank you @andrey.potapov for keeping us posted.

6

@ottap,
Thank you for using Aspose.Slides.

7

A post was split to a new topic: Aspose.Slides for .NET 23.6 Requires Manually Importing DLL

8

@ottap,
The sample project you provided includes Aspose.Slides for .NET via NuGet. The Aspose.Slides NuGet package is not suitable because it provides cross-platform support for only the .NET Standard.

Please delete the Aspose.Slides NuGet package and follow the instructions below to configure your project using Aspose.Slides from the ZIP package:

Please also note that the following packages must be installed on your operating system.

  • libfontconfig1
  • libfreetype6

Please let us know if the issue is resolved on your end.