PythonEngine fails to initialize in VSIX extension #2405

cpgames · 2024-06-22T22:22:40Z

cpgames
Jun 22, 2024

Environment

Pythonnet version: 3.0.3, 3.1.0
Python version: 3.09
Operating System: Win11
.NET Runtime: 4.8

Details

Describe what you were trying to get done.

I am trying to use pythonnet package in a VSIX Visual Studio extension.
The Experimental VS Instance initializes pythonnet fine, however deploying an extension causes this crash.
I suspect there may be some threading issues, but am not sure what to look for.

What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.

try
{
    Runtime.PythonDLL = pythonFile.FullName;
    PythonEngine.PythonHome = pythonFile.DirectoryName!;
    OutputWindowHelper.LogInfo("PythonEngine", "Initializing Python engine.");
    PythonEngine.Initialize(); // crash here
    PythonEngine.BeginAllowThreads();
}
catch (Exception ex)
{
    OutputWindowHelper.LogError(ex);
}

If there was a crash, please include the traceback here.

[INFO] - PythonEngine: Initializing Python engine.
[ERROR]: Object reference not set to an instance of an object.
[TRACE]:    at Python.Runtime.ClassManager.GetClassInfo(Type type, ClassBase impl)
   at Python.Runtime.ClassManager.InitClassBase(Type type, ClassBase impl, ReflectedClrType pyType)
   at Python.Runtime.ReflectedClrType.GetOrCreate(Type type)
   at Python.Runtime.ModuleObject.GetAttribute(String name, Boolean guess)
   at Python.Runtime.ModuleObject.LoadNames()
   at Python.Runtime.ImportHook.UpdateCLRModuleDict()
   at Python.Runtime.PythonEngine.Initialize(IEnumerable`1 args, Boolean setSysArgv, Boolean initSigs)
   at Python.Runtime.PythonEngine.Initialize()
   at cpGames.VSA.ToolAPI.<InitializePythonEngineAsync>d__2.MoveNext() in ToolAPI.cs:line 69 // PythonEngine.Initialize(); call

Answered by cpgames

Jun 23, 2024

Why you close my issue?

Here's your fix:

internal static bool ShouldBindEvent(EventInfo ei)
        {
            var mb = ei.GetAddMethod(true);
            if (mb == null)
            {
                return false;
            }
            return ShouldBindMethod(mb);
        }

Check your nulls, thank me later.

View full answer

cpgames · 2024-06-23T10:24:15Z

cpgames
Jun 23, 2024
Author

Why you close my issue?

Here's your fix:

internal static bool ShouldBindEvent(EventInfo ei)
        {
            var mb = ei.GetAddMethod(true);
            if (mb == null)
            {
                return false;
            }
            return ShouldBindMethod(mb);
        }

Check your nulls, thank me later.

0 replies

adrctr · 2024-07-08T19:32:40Z

adrctr
Jul 8, 2024

Hello ,

I have the same issue, I am trying to use pythonnet package in a VSIX Visual Studio extension.

I am going to apply this fix above made by @cpgames and see if the problem persists.

Do you intend to release this fix in a future version of pythonnet ?

Regards,

0 replies

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