New submission from Marco Clemencic: When passing a Python int to a C function expecting long int (or void*) via ctypes, the number gets truncated to 32 bits, even if the args types are correctly declared. The workaround is to wrap the argument in c_long (or c_void_p), but the automatic unwrapping of c_long (or c_void_p) in the return type lead to undefined behaviour in code like:
myClib.getNumber.restype = c_long myClib.doSomething.args = [c_long] l = myClib.getnumber() myClib.doSomething(l) ---------- components: ctypes files: test_py.tar.bz2 messages: 245494 nosy: Marco Clemencic priority: normal severity: normal status: open title: ctypes incorrect handling of long int on 64bits Linux type: behavior versions: Python 2.7 Added file: http://bugs.python.org/file39736/test_py.tar.bz2 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24470> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
