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Python Ctypes – loading dll throws OSError: [WinError 193] %1 is not a valid Win32 application

Mentioning [Python.Docs]: ctypes – A foreign function library for Python (although this doesn’t have very much to do with it) just in case. The underlying error is ERROR_BAD_EXE_FORMAT (193, 0xC1). Check it in [MS.Docs]: System Error Codes (0-499). It’s a general Win error (not related to Python). In the current case (related to Python), the … Read more

C function called from Python via ctypes returns incorrect value

Listing [Python 3.Docs]: ctypes – A foreign function library for Python. In order for everything to be properly converted (Python <=> C) when calling the function (residing in a .dll (.so)), 2 things need to be specified (leaving x86 calling convention (Win) aside): Argument types Return type In CTypes, this is achieved by specifying: argtypes … Read more