[EMAIL PROTECTED] schrieb: > Q: The C idea of (pv != NULL) is said most directly in Python ctypes > how? > > A: We are of course supposed to write something like: > > def c_not_null(pv): > return (ctypes.cast(pv, ctypes.c_void_p).value != None) > > Yes? > > Working from the doc, me the clueless newbie, I was slow to guess such > relevant truths as: > > ctypes.c_void_p(0).value == None > ctypes.c_void_p(0) != ctypes.c_void_p(0) > > Curiously yours, thanks in advance, Pat LaVarre >
Generally pointer instances have a False boolean value, so 'if pv: ....' should work. Except for c_void_p, c_char_p and c_wchar_p instances. Thomas -- http://mail.python.org/mailman/listinfo/python-list
