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67 lines
2.8 KiB
67 lines
2.8 KiB
import unittest
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from ctypes import *
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import _ctypes_test
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class ReturnFuncPtrTestCase(unittest.TestCase):
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def test_with_prototype(self):
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# The _ctypes_test shared lib/dll exports quite some functions for testing.
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# The get_strchr function returns a *pointer* to the C strchr function.
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dll = CDLL(_ctypes_test.__file__)
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get_strchr = dll.get_strchr
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get_strchr.restype = CFUNCTYPE(c_char_p, c_char_p, c_char)
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strchr = get_strchr()
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self.assertEqual(strchr(b"abcdef", b"b"), b"bcdef")
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self.assertEqual(strchr(b"abcdef", b"x"), None)
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self.assertEqual(strchr(b"abcdef", 98), b"bcdef")
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self.assertEqual(strchr(b"abcdef", 107), None)
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self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0)
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self.assertRaises(TypeError, strchr, b"abcdef")
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def test_without_prototype(self):
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dll = CDLL(_ctypes_test.__file__)
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get_strchr = dll.get_strchr
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# the default 'c_int' would not work on systems where sizeof(int) != sizeof(void *)
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get_strchr.restype = c_void_p
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addr = get_strchr()
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# _CFuncPtr instances are now callable with an integer argument
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# which denotes a function address:
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strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)(addr)
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self.assertTrue(strchr(b"abcdef", b"b"), "bcdef")
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self.assertEqual(strchr(b"abcdef", b"x"), None)
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self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0)
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self.assertRaises(TypeError, strchr, b"abcdef")
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def test_from_dll(self):
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dll = CDLL(_ctypes_test.__file__)
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# _CFuncPtr instances are now callable with a tuple argument
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# which denotes a function name and a dll:
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strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)(("my_strchr", dll))
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self.assertTrue(strchr(b"abcdef", b"b"), "bcdef")
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self.assertEqual(strchr(b"abcdef", b"x"), None)
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self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0)
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self.assertRaises(TypeError, strchr, b"abcdef")
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# Issue 6083: Reference counting bug
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def test_from_dll_refcount(self):
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class BadSequence(tuple):
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def __getitem__(self, key):
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if key == 0:
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return "my_strchr"
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if key == 1:
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return CDLL(_ctypes_test.__file__)
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raise IndexError
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# _CFuncPtr instances are now callable with a tuple argument
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# which denotes a function name and a dll:
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strchr = CFUNCTYPE(c_char_p, c_char_p, c_char)(
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BadSequence(("my_strchr", CDLL(_ctypes_test.__file__))))
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self.assertTrue(strchr(b"abcdef", b"b"), "bcdef")
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self.assertEqual(strchr(b"abcdef", b"x"), None)
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self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0)
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self.assertRaises(TypeError, strchr, b"abcdef")
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if __name__ == "__main__":
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unittest.main()
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