test_byteswap.py 文件源码

def test_struct_struct(self):
        # nested structures with different byteorders

        # create nested structures with given byteorders and set memory to data

        for nested, data in (
            (BigEndianStructure, b'\0\0\0\1\0\0\0\2'),
            (LittleEndianStructure, b'\1\0\0\0\2\0\0\0'),
        ):
            for parent in (
                BigEndianStructure,
                LittleEndianStructure,
                Structure,
            ):
                class NestedStructure(nested):
                    _fields_ = [("x", c_uint32),
                                ("y", c_uint32)]

                class TestStructure(parent):
                    _fields_ = [("point", NestedStructure)]

                self.assertEqual(len(data), sizeof(TestStructure))
                ptr = POINTER(TestStructure)
                s = cast(data, ptr)[0]
                del ctypes._pointer_type_cache[TestStructure]
                self.assertEqual(s.point.x, 1)
                self.assertEqual(s.point.y, 2)