eryksun added the comment:
ctypes LibraryLoader instances cache CDLL/WinDLL instances, which cache
function pointers. Using the global ctypes.cdll and ctypes.windll loaders can
lead to conflicting definitions for restype, argtypes, and errcheck. I suggest
using a private LibraryLoader in windows_helper, e.g.:
windll = ctypes.LibraryLoader(ctypes.WinDLL)
----------
nosy: +eryksun
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<http://bugs.python.org/issue21518>
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