_ctypes_extend_error prints exception class string representation instead of exception class name #92119

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#98302

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_ctypes_extend_error prints exception class string representation instead of exception class name#92119

#98302

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topic-ctypestype-bugAn unexpected behavior, bug, or error

Description

chgnrdv

opened

on May 1, 2022

Example:

>>> import ctypes>>> lib = ctypes.CDLL("some_dll")>>> lib.c_function.argtypes = [ctypes.c_char_p, ctypes.c_int]>>> lib.c_function(123, "Foobar")Traceback (most recent call last):  File "<stdin>", line 1, in <module>ctypes.ArgumentError: argument 1: <class 'TypeError'>: wrong type

Expected behavior is to print exception name ("TypeError") as stated in documentation:
https://github.com/python/cpython/blob/main/Doc/library/ctypes.rst#specifying-the-required-argument-types-function-prototypes

Possible solution is to use PyType_GetName instead of PyObject_Str at

cpython/Modules/_ctypes/callproc.c

Line 1019 inad5e852

cls_str=PyObject_Str(tp);

but I'm not sure how to draw it up correctly.