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test_pickling.py
import unittest import pickle from ctypes import * import _ctypes_test dll = CDLL(_ctypes_test.__file__) class X(Structure): _fields_ = [("a", c_int), ("b", c_double)] init_called = 0 def __init__(self, *args, **kw): X.init_called += 1 self.x = 42 class Y(X): _fields_ = [("str", c_char_p)] class PickleTest: def dumps(self, item): return pickle.dumps(item, self.proto) def loads(self, item): return pickle.loads(item) def test_simple(self): for src in [ c_int(42), c_double(3.14), ]: dst = self.loads(self.dumps(src)) self.assertEqual(src.__dict__, dst.__dict__) self.assertEqual(memoryview(src).tobytes(), memoryview(dst).tobytes()) def test_struct(self): X.init_called = 0 x = X() x.a = 42 self.assertEqual(X.init_called, 1) y = self.loads(self.dumps(x)) # loads must NOT call __init__ self.assertEqual(X.init_called, 1) # ctypes instances are identical when the instance __dict__ # and the memory buffer are identical self.assertEqual(y.__dict__, x.__dict__) self.assertEqual(memoryview(y).tobytes(), memoryview(x).tobytes()) def test_unpickable(self): # ctypes objects that are pointers or contain pointers are # unpickable. self.assertRaises(ValueError, lambda: self.dumps(Y())) prototype = CFUNCTYPE(c_int) for item in [ c_char_p(), c_wchar_p(), c_void_p(), pointer(c_int(42)), dll._testfunc_p_p, prototype(lambda: 42), ]: self.assertRaises(ValueError, lambda: self.dumps(item)) def test_wchar(self): self.dumps(c_char(b"x")) # Issue 5049 self.dumps(c_wchar("x")) for proto in range(pickle.HIGHEST_PROTOCOL + 1): name = 'PickleTest_%s' % proto globals()[name] = type(name, (PickleTest, unittest.TestCase), {'proto': proto}) if __name__ == "__main__": unittest.main()