| from ctypes import * |
| import unittest |
| import sys |
| |
| class Test(unittest.TestCase): |
| |
| def test_array2pointer(self): |
| array = (c_int * 3)(42, 17, 2) |
| |
| # casting an array to a pointer works. |
| ptr = cast(array, POINTER(c_int)) |
| self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) |
| |
| if 2*sizeof(c_short) == sizeof(c_int): |
| ptr = cast(array, POINTER(c_short)) |
| if sys.byteorder == "little": |
| self.assertEqual([ptr[i] for i in range(6)], |
| [42, 0, 17, 0, 2, 0]) |
| else: |
| self.assertEqual([ptr[i] for i in range(6)], |
| [0, 42, 0, 17, 0, 2]) |
| |
| def test_address2pointer(self): |
| array = (c_int * 3)(42, 17, 2) |
| |
| address = addressof(array) |
| ptr = cast(c_void_p(address), POINTER(c_int)) |
| self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) |
| |
| ptr = cast(address, POINTER(c_int)) |
| self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) |
| |
| def test_p2a_objects(self): |
| array = (c_char_p * 5)() |
| self.assertEqual(array._objects, None) |
| array[0] = "foo bar" |
| self.assertEqual(array._objects, {'0': "foo bar"}) |
| |
| p = cast(array, POINTER(c_char_p)) |
| # array and p share a common _objects attribute |
| self.assertTrue(p._objects is array._objects) |
| self.assertEqual(array._objects, {'0': "foo bar", id(array): array}) |
| p[0] = "spam spam" |
| self.assertEqual(p._objects, {'0': "spam spam", id(array): array}) |
| self.assertTrue(array._objects is p._objects) |
| p[1] = "foo bar" |
| self.assertEqual(p._objects, {'1': 'foo bar', '0': "spam spam", id(array): array}) |
| self.assertTrue(array._objects is p._objects) |
| |
| def test_other(self): |
| p = cast((c_int * 4)(1, 2, 3, 4), POINTER(c_int)) |
| self.assertEqual(p[:4], [1,2, 3, 4]) |
| self.assertEqual(p[:4:], [1, 2, 3, 4]) |
| self.assertEqual(p[3:-1:-1], [4, 3, 2, 1]) |
| self.assertEqual(p[:4:3], [1, 4]) |
| c_int() |
| self.assertEqual(p[:4], [1, 2, 3, 4]) |
| self.assertEqual(p[:4:], [1, 2, 3, 4]) |
| self.assertEqual(p[3:-1:-1], [4, 3, 2, 1]) |
| self.assertEqual(p[:4:3], [1, 4]) |
| p[2] = 96 |
| self.assertEqual(p[:4], [1, 2, 96, 4]) |
| self.assertEqual(p[:4:], [1, 2, 96, 4]) |
| self.assertEqual(p[3:-1:-1], [4, 96, 2, 1]) |
| self.assertEqual(p[:4:3], [1, 4]) |
| c_int() |
| self.assertEqual(p[:4], [1, 2, 96, 4]) |
| self.assertEqual(p[:4:], [1, 2, 96, 4]) |
| self.assertEqual(p[3:-1:-1], [4, 96, 2, 1]) |
| self.assertEqual(p[:4:3], [1, 4]) |
| |
| def test_char_p(self): |
| # This didn't work: bad argument to internal function |
| s = c_char_p("hiho") |
| self.assertEqual(cast(cast(s, c_void_p), c_char_p).value, |
| "hiho") |
| |
| try: |
| c_wchar_p |
| except NameError: |
| pass |
| else: |
| def test_wchar_p(self): |
| s = c_wchar_p("hiho") |
| self.assertEqual(cast(cast(s, c_void_p), c_wchar_p).value, |
| "hiho") |
| |
| if __name__ == "__main__": |
| unittest.main() |
