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[Looking for Suggestion] Unable to find assembly: SkiaSharp #2588

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chaojian-zhang opened this issue Apr 30, 2025 · 2 comments
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[Looking for Suggestion] Unable to find assembly: SkiaSharp #2588

chaojian-zhang opened this issue Apr 30, 2025 · 2 comments

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@chaojian-zhang
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chaojian-zhang commented Apr 30, 2025 •
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Hi, thanks for the great library! It has been tremendously helpful in both my personal and professional life!

Right now I am encountering a problem that might not be pythonnet specific but is not obvious to solve and encountered when I use Pythonnet. Specifically, when my project references SkiaSharp which contains native dlls, pythonnet will not be able to load everything properly - it locates the entry assembly fine, but the dependencies are not loaded. The initial import is ok but during runtime an exception is thrown.

Would love to hear any suggestions on solving this problem.

Environment

  • Pythonnet version: 3.0.5
  • Python version: 3.11.9 64bit
  • Operating System: Windows 7 64-bit

Below is the entry assembly, which directly references SkiaSharp.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="SkiaSharp" Version="3.119.0" />
  </ItemGroup>
</Project>
using SkiaSharp;

namespace PythonNetSkiaSharpProblem
{
    public class Program
    {
        public static void Main(string[] args)
        {
            try
            {
                var info = new SKImageInfo(width: 64, height: 64);
                using var surface = SKSurface.Create(info);
                SKCanvas canvas = surface.Canvas;
                canvas.Clear(new SKColor(red: 0, green: 200, blue: 200, alpha: 255));
                using SKImage image = surface.Snapshot();
                using SKData pngData = image.Encode(SKEncodedImageFormat.Png, quality: 100);
                const string outputPath = "filled64.png";
                using var stream = File.OpenWrite(outputPath);
                pngData.SaveTo(stream);

                System.Console.WriteLine($"Saved {outputPath}");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }   
        }
    }
}

And this is how I am referencing the entry assembly, from some location outside the published folder (notice the same problem happens even if this script is placed directly inside the published folder).

import sys
sys.path.insert(0, r"C:\Users\Charles Zhang\Desktop\Temp\PythonNetSkiaSharpProblem\PythonNetSkiaSharpProblem\bin\Debug\net8.0")

import pythonnet
pythonnet.load("coreclr")

import clr
clr.AddReference("PythonNetSkiaSharpProblem")

from PythonNetSkiaSharpProblem import Program
Program.Main([]) # Exception in stack

Output:

System.TypeInitializationException: The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
 ---> System.DllNotFoundException: Unable to load DLL 'libSkiaSharp' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SKImageInfo..cctor()
   --- End of inner exception stack trace ---
   at SkiaSharp.SKImageInfo..ctor(Int32 width, Int32 height)
   at PythonNetSkiaSharpProblem.Program.Main(String[] args) in C:\Users\Charles Zhang\Desktop\Temp\PythonNetSkiaSharpProblem\PythonNetSkiaSharpProblem\Program.cs:line 11

This is likely due to this folder structure:

└───net8.0
    │   PythonNetSkiaSharpProblem.deps.json
    │   PythonNetSkiaSharpProblem.dll
    │   PythonNetSkiaSharpProblem.exe
    │   PythonNetSkiaSharpProblem.pdb
    │   PythonNetSkiaSharpProblem.runtimeconfig.json
    │   SkiaSharp.dll
    │
    └───runtimes
        ├───osx
        │   └───native
        │           libSkiaSharp.dylib
        │
        ├───win-arm64
        │   └───native
        │           libSkiaSharp.dll
        │
        ├───win-x64
        │   └───native
        │           libSkiaSharp.dll
        │
        └───win-x86
            └───native
                    libSkiaSharp.dll

See: https://github.com/Charles-Zhang-Python/PythonNetSkiaSharpProblem

This might be related to #468 but is somewhat different since I am not loading the dll directly, and everything is .Net 8 properly.
@chaojian-zhang chaojian-zhang mentioned this issue Apr 30, 2025
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@chaojian-zhang
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chaojian-zhang commented Apr 30, 2025 •
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Notice a workaround is to copy libSkiaSharp.dll directly to the root of the published folder.
But this won't work cross-platform and also if we have many similar libraries that exhibit similar behavior then it's not convenient.

@filmor
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filmor commented May 2, 2025

  1. Your link is not working
  2. You are creating an executable, not a library
  3. Please try using dotnet publish

@pythonnet pythonnet locked and limited conversation to collaborators May 2, 2025
@filmor filmor converted this issue into discussion #2589 May 2, 2025

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@filmor @chaojian-zhang