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✏️ test_pickling.py

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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(u"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()

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✏️ test_pickling.py