New submission from Erwan Le Pape: When using a custom class to store a ctype value, passing that class as a function argument explicitly declared to be a pointer type fails to pass the _as_parameter_ class attribute as a pointer and instead raises a TypeError.
For example: >>> from ctypes import * >>> from ctypes.wintypes import * >>> >>> class CustomPHKEY(object): ... def __init__(self, value): ... self._as_parameter_ = HKEY(value) ... >>> >>> function = windll.function >>> function.argtypes = [POINTER(HKEY)] >>> function.restype = LONG >>> result = CustomPHKEY(0) >>> function(result) Traceback (most recent call last): File "<stdin>", line 1, in <module> ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: expected LP_c_void_p instance instead of c_void_p Shouldn't ctypes apply the required byref() conversion automatically? Or is this behavior normal and automatic byref() only concerns native ctypes types? I only flagged Python 3.5 and Python 2.7 since they are the only ones I explicitly tested this on but I suspect other versions are affected. ---------- components: ctypes messages: 273149 nosy: amaury.forgeotdarc, belopolsky, lepaperwan, meador.inge priority: normal severity: normal status: open title: ctypes automatic byref failing on custom classes attributes type: behavior versions: Python 2.7, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27803> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
