Eryk Sun <eryk...@gmail.com> added the comment:
A function that returns a pointer needs an explicit `restype` set. A function
parameter that's a pointer generally requires `argtypes` to be set. For example:
_testdll.GetPointer.restype = ctypes.c_void_p
_testdll.SetPointer.argtypes = (ctypes.c_void_p,)
Unfortunately the ctypes documentation starts with a tutorial that promotes bad
practices and misuses WinAPI GetModuleHandle multiple times, which gives people
the wrong idea about pointer return values. However, the tutorial does mention
that Python integers are passed as C int values by default and that C int is
the default return type. It also shows how to use the `argtypes` and `restype`
attributes.
----------
nosy: +eryksun
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42311>
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