1 from ctypes import * 2 import unittest 3 import sys 4 5 class Test(unittest.TestCase): 6 7 def test_array2pointer(self): 8 array = (c_int * 3)(42, 17, 2) 9 10 # casting an array to a pointer works. 11 ptr = cast(array, POINTER(c_int)) 12 self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) 13 14 if 2*sizeof(c_short) == sizeof(c_int): 15 ptr = cast(array, POINTER(c_short)) 16 if sys.byteorder == "little": 17 self.assertEqual([ptr[i] for i in range(6)], 18 [42, 0, 17, 0, 2, 0]) 19 else: 20 self.assertEqual([ptr[i] for i in range(6)], 21 [0, 42, 0, 17, 0, 2]) 22 23 def test_address2pointer(self): 24 array = (c_int * 3)(42, 17, 2) 25 26 address = addressof(array) 27 ptr = cast(c_void_p(address), POINTER(c_int)) 28 self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) 29 30 ptr = cast(address, POINTER(c_int)) 31 self.assertEqual([ptr[i] for i in range(3)], [42, 17, 2]) 32 33 def test_p2a_objects(self): 34 array = (c_char_p * 5)() 35 self.assertEqual(array._objects, None) 36 array[0] = "foo bar" 37 self.assertEqual(array._objects, {'0': "foo bar"}) 38 39 p = cast(array, POINTER(c_char_p)) 40 # array and p share a common _objects attribute 41 self.assertTrue(p._objects is array._objects) 42 self.assertEqual(array._objects, {'0': "foo bar", id(array): array}) 43 p[0] = "spam spam" 44 self.assertEqual(p._objects, {'0': "spam spam", id(array): array}) 45 self.assertTrue(array._objects is p._objects) 46 p[1] = "foo bar" 47 self.assertEqual(p._objects, {'1': 'foo bar', '0': "spam spam", id(array): array}) 48 self.assertTrue(array._objects is p._objects) 49 50 def test_other(self): 51 p = cast((c_int * 4)(1, 2, 3, 4), POINTER(c_int)) 52 self.assertEqual(p[:4], [1,2, 3, 4]) 53 self.assertEqual(p[:4:], [1, 2, 3, 4]) 54 self.assertEqual(p[3:-1:-1], [4, 3, 2, 1]) 55 self.assertEqual(p[:4:3], [1, 4]) 56 c_int() 57 self.assertEqual(p[:4], [1, 2, 3, 4]) 58 self.assertEqual(p[:4:], [1, 2, 3, 4]) 59 self.assertEqual(p[3:-1:-1], [4, 3, 2, 1]) 60 self.assertEqual(p[:4:3], [1, 4]) 61 p[2] = 96 62 self.assertEqual(p[:4], [1, 2, 96, 4]) 63 self.assertEqual(p[:4:], [1, 2, 96, 4]) 64 self.assertEqual(p[3:-1:-1], [4, 96, 2, 1]) 65 self.assertEqual(p[:4:3], [1, 4]) 66 c_int() 67 self.assertEqual(p[:4], [1, 2, 96, 4]) 68 self.assertEqual(p[:4:], [1, 2, 96, 4]) 69 self.assertEqual(p[3:-1:-1], [4, 96, 2, 1]) 70 self.assertEqual(p[:4:3], [1, 4]) 71 72 def test_char_p(self): 73 # This didn't work: bad argument to internal function 74 s = c_char_p("hiho") 75 self.assertEqual(cast(cast(s, c_void_p), c_char_p).value, 76 "hiho") 77 78 try: 79 c_wchar_p 80 except NameError: 81 pass 82 else: 83 def test_wchar_p(self): 84 s = c_wchar_p("hiho") 85 self.assertEqual(cast(cast(s, c_void_p), c_wchar_p).value, 86 "hiho") 87 88 if __name__ == "__main__": 89 unittest.main() 90
