[issue39393] Misleading error message upon dependent DLL resolution failure

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

That clarification seems okay to me. The error message is in load_library in Modules/_ctypes/callproc.c. 

The underlying problem is that the directory of the DLL is only added to the search path (in CDLL.__init__ in Lib/ctypes/__init__.py) if the caller uses a qualified path. This is an OS limit that we can't avoid.

Also note that the suggestion to use a qualified path won't necessarily resolve the problem, in which case scripts will have to use os.add_dll_directory, and find a reliable way to identify the required directories.

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components: +Extension Modules
keywords: +easy (C)
nosy: +eryksun
stage:  -> needs patch

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<https://bugs.python.org/issue39393>
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