import ctypes
import unittest
from ctypes import (CDLL, Structure, CFUNCTYPE, sizeof, _CFuncPtr,
c_void_p, c_char_p, c_char, c_int, c_uint, c_long)
from test.support import import_helper
_ctypes_test = import_helper.import_module("_ctypes_test")
from ._support import (_CData, PyCFuncPtrType, Py_TPFLAGS_DISALLOW_INSTANTIATION,
Py_TPFLAGS_IMMUTABLETYPE)
try:
WINFUNCTYPE = ctypes.WINFUNCTYPE
except AttributeError:
# fake to enable this test on Linux
WINFUNCTYPE = CFUNCTYPE
lib = CDLL(_ctypes_test.__file__)
class CFuncPtrTestCase(unittest.TestCase):
def test_inheritance_hierarchy(self):
self.assertEqual(_CFuncPtr.mro(), [_CFuncPtr, _CData, object])
self.assertEqual(PyCFuncPtrType.__name__, "PyCFuncPtrType")
self.assertEqual(type(PyCFuncPtrType), type)
def test_type_flags(self):
for cls in _CFuncPtr, PyCFuncPtrType:
with self.subTest(cls=cls):
self.assertTrue(_CFuncPtr.__flags__ & Py_TPFLAGS_IMMUTABLETYPE)
self.assertFalse(_CFuncPtr.__flags__ & Py_TPFLAGS_DISALLOW_INSTANTIATION)
def test_metaclass_details(self):
# Cannot call the metaclass __init__ more than once
CdeclCallback = CFUNCTYPE(c_int, c_int, c_int)
with self.assertRaisesRegex(SystemError, "already initialized"):
PyCFuncPtrType.__init__(CdeclCallback, 'ptr', (), {})
def test_basic(self):
X = WINFUNCTYPE(c_int, c_int, c_int)
def func(*args):
return len(args)
x = X(func)
self.assertEqual(x.restype, c_int)
self.assertEqual(x.argtypes, (c_int, c_int))
self.assertEqual(sizeof(x), sizeof(c_void_p))
self.assertEqual(sizeof(X), sizeof(c_void_p))
def test_first(self):
StdCallback = WINFUNCTYPE(c_int, c_int, c_int)
CdeclCallback = CFUNCTYPE(c_int, c_int, c_int)
def func(a, b):
return a + b
s = StdCallback(func)
c = CdeclCallback(func)
self.assertEqual(s(1, 2), 3)
self.assertEqual(c(1, 2), 3)
# The following no longer raises a TypeError - it is now
# possible, as in C, to call cdecl functions with more parameters.
#self.assertRaises(TypeError, c, 1, 2, 3)
self.assertEqual(c(1, 2, 3, 4, 5, 6), 3)
if WINFUNCTYPE is not CFUNCTYPE:
self.assertRaises(TypeError, s, 1, 2, 3)
def test_structures(self):
WNDPROC = WINFUNCTYPE(c_long, c_int, c_int, c_int, c_int)
def wndproc(hwnd, msg, wParam, lParam):
return hwnd + msg + wParam + lParam
HINSTANCE = c_int
HICON = c_int
HCURSOR = c_int
LPCTSTR = c_char_p
class WNDCLASS(Structure):
_fields_ = [("style", c_uint),
("lpfnWndProc", WNDPROC),
("cbClsExtra", c_int),
("cbWndExtra", c_int),
("hInstance", HINSTANCE),
("hIcon", HICON),
("hCursor", HCURSOR),
("lpszMenuName", LPCTSTR),
("lpszClassName", LPCTSTR)]
wndclass = WNDCLASS()
wndclass.lpfnWndProc = WNDPROC(wndproc)
WNDPROC_2 = WINFUNCTYPE(c_long, c_int, c_int, c_int, c_int)
self.assertIs(WNDPROC, WNDPROC_2)
self.assertEqual(wndclass.lpfnWndProc(1, 2, 3, 4), 10)
f = wndclass.lpfnWndProc
del wndclass
del wndproc
self.assertEqual(f(10, 11, 12, 13), 46)
def test_dllfunctions(self):
strchr = lib.my_strchr
strchr.restype = c_char_p
strchr.argtypes = (c_char_p, c_char)
self.assertEqual(strchr(b"abcdefghi", b"b"), b"bcdefghi")
self.assertEqual(strchr(b"abcdefghi", b"x"), None)
strtok = lib.my_strtok
strtok.restype = c_char_p
def c_string(init):
size = len(init) + 1
return (c_char*size)(*init)
s = b"a\nb\nc"
b = c_string(s)
self.assertEqual(strtok(b, b"\n"), b"a")
self.assertEqual(strtok(None, b"\n"), b"b")
self.assertEqual(strtok(None, b"\n"), b"c")
self.assertEqual(strtok(None, b"\n"), None)
def test_abstract(self):
self.assertRaises(TypeError, _CFuncPtr, 13, "name", 42, "iid")
if __name__ == '__main__':
unittest.main()
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