| import unittest |
| from ctypes import * |
| import os |
| |
| import _ctypes_test |
| |
| class ReturnFuncPtrTestCase(unittest.TestCase): |
| |
| def test_with_prototype(self): |
| # The _ctypes_test shared lib/dll exports quite some functions for testing. |
| # The get_strchr function returns a *pointer* to the C strchr function. |
| dll = CDLL(_ctypes_test.__file__) |
| get_strchr = dll.get_strchr |
| get_strchr.restype = CFUNCTYPE(c_char_p, c_char_p, c_char) |
| strchr = get_strchr() |
| self.assertEqual(strchr("abcdef", "b"), "bcdef") |
| self.assertEqual(strchr("abcdef", "x"), None) |
| self.assertRaises(ArgumentError, strchr, "abcdef", 3) |
| self.assertRaises(TypeError, strchr, "abcdef") |
| |
| def test_without_prototype(self): |
| dll = CDLL(_ctypes_test.__file__) |
| get_strchr = dll.get_strchr |
| # the default 'c_int' would not work on systems where sizeof(int) != sizeof(void *) |
| get_strchr.restype = c_void_p |
| addr = get_strchr() |
| # _CFuncPtr instances are now callable with an integer argument |
| # which denotes a function address: |
| strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)(addr) |
| self.assertTrue(strchr("abcdef", "b"), "bcdef") |
| self.assertEqual(strchr("abcdef", "x"), None) |
| self.assertRaises(ArgumentError, strchr, "abcdef", 3) |
| self.assertRaises(TypeError, strchr, "abcdef") |
| |
| def test_from_dll(self): |
| dll = CDLL(_ctypes_test.__file__) |
| # _CFuncPtr instances are now callable with a tuple argument |
| # which denotes a function name and a dll: |
| strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)(("my_strchr", dll)) |
| self.assertTrue(strchr(b"abcdef", b"b"), "bcdef") |
| self.assertEqual(strchr(b"abcdef", b"x"), None) |
| self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0) |
| self.assertRaises(TypeError, strchr, b"abcdef") |
| |
| # Issue 6083: Reference counting bug |
| def test_from_dll_refcount(self): |
| class BadSequence(tuple): |
| def __getitem__(self, key): |
| if key == 0: |
| return "my_strchr" |
| if key == 1: |
| return CDLL(_ctypes_test.__file__) |
| raise IndexError |
| |
| # _CFuncPtr instances are now callable with a tuple argument |
| # which denotes a function name and a dll: |
| strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)( |
| BadSequence(("my_strchr", CDLL(_ctypes_test.__file__)))) |
| self.assertTrue(strchr(b"abcdef", b"b"), "bcdef") |
| self.assertEqual(strchr(b"abcdef", b"x"), None) |
| self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0) |
| self.assertRaises(TypeError, strchr, b"abcdef") |
| |
| if __name__ == "__main__": |
| unittest.main() |
