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Editorial Team
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Asked: 2026-05-15T07:34:05+00:00

I have a python .pyd that is a mixed mode C++ DLL. The DLL

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I have a python .pyd that is a mixed mode C++ DLL. The DLL loads fine and loads unmanaged C++ dlls without a problem, but when it tries to load the .NET dlls referenced by the managed C++ dlls it fails with this error message:

Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly '...'

Copying these .NET dlls to the directory that pythod_d.exe is contained in allows the .NET libraries to load successfully, but this is not a good long term solution. Is there an environment variable I have to set or some command line option to python_d.exe that will solve my problem?

Note that using IronPython or Python .NET is NOT acceptable.

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1 Answer

  1. Editorial Team

    I think I’ve resolved the problem. Assembly loading doesn’t use the path set by SetDllDirectory(), and it looks like Python calls this function. By registering a delegate for the event AppDomain.AssemblyResolve(), I can catch the name of the dll that failed, append it to the directory obtained from GetDllDirectory(), and then manually load the assembly myself.

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