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test_returnfuncptrs.py
import unittest from ctypes import * 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(b"abcdef", b"b"), b"bcdef") self.assertEqual(strchr(b"abcdef", b"x"), None) self.assertEqual(strchr(b"abcdef", 98), b"bcdef") self.assertEqual(strchr(b"abcdef", 107), None) self.assertRaises(ArgumentError, strchr, b"abcdef", 3.0) self.assertRaises(TypeError, strchr, b"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(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") 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()
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