test_keeprefs.py 文件源码

def test(self):
        class POINT(Structure):
            _fields_ = [("x", c_int), ("y", c_int)]
        class RECT(Structure):
            _fields_ = [("a", POINTER(POINT)),
                        ("b", POINTER(POINT))]
        r = RECT()
        p1 = POINT(1, 2)

        r.a = pointer(p1)
        r.b = pointer(p1)
##        from pprint import pprint as pp
##        pp(p1._objects)
##        pp(r._objects)

        r.a[0].x = 42
        r.a[0].y = 99

        # to avoid leaking when tests are run several times
        # clean up the types left in the cache.
        from ctypes import _pointer_type_cache
        del _pointer_type_cache[POINT]