STINNER Victor <victor.stin...@haypocalc.com> added the comment: > I just want to call my C function.
You can use something else than ctypes_array.from_buffer(buffer). ctypes_array.from_buffer() creates a read-write object which can be used to modify the buffer. You cannot pass a read-only object to ctypes_array.from_buffer(). > I'm pretty sure that I verified that this code worked in 3.1.3 before > opening this bug, but it's been a while. If it was possible, it was a bug. You cannot modify a read-only object, like bytes, because it would lead to inconsistent object and may lead your program to a crash, even if you don't call C functions. Example in pure Python: >>> import ctypes >>> T=(ctypes.c_uint8*4) >>> B=bytearray(4) >>> x=T.from_buffer(B) >>> B bytearray(b'\x00\x00\x00\x00') >>> x[0]=9 >>> x[2]=100 >>> B bytearray(b'\t\x00d\x00') >>> list(x) >>> [9, 0, 100, 0] B is modified when x[index] is modified. -- A bug tracker is not the right place to ask help with ctypes. ---------- resolution: -> invalid status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11427> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
