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test_keeprefs.py
from ctypes import * import unittest class SimpleTestCase(unittest.TestCase): def test_cint(self): x = c_int() self.assertEqual(x._objects, None) x.value = 42 self.assertEqual(x._objects, None) x = c_int(99) self.assertEqual(x._objects, None) def test_ccharp(self): x = c_char_p() self.assertEqual(x._objects, None) x.value = b"abc" self.assertEqual(x._objects, b"abc") x = c_char_p(b"spam") self.assertEqual(x._objects, b"spam") class StructureTestCase(unittest.TestCase): def test_cint_struct(self): class X(Structure): _fields_ = [("a", c_int), ("b", c_int)] x = X() self.assertEqual(x._objects, None) x.a = 42 x.b = 99 self.assertEqual(x._objects, None) def test_ccharp_struct(self): class X(Structure): _fields_ = [("a", c_char_p), ("b", c_char_p)] x = X() self.assertEqual(x._objects, None) x.a = b"spam" x.b = b"foo" self.assertEqual(x._objects, {"0": b"spam", "1": b"foo"}) def test_struct_struct(self): class POINT(Structure): _fields_ = [("x", c_int), ("y", c_int)] class RECT(Structure): _fields_ = [("ul", POINT), ("lr", POINT)] r = RECT() r.ul.x = 0 r.ul.y = 1 r.lr.x = 2 r.lr.y = 3 self.assertEqual(r._objects, None) r = RECT() pt = POINT(1, 2) r.ul = pt self.assertEqual(r._objects, {'0': {}}) r.ul.x = 22 r.ul.y = 44 self.assertEqual(r._objects, {'0': {}}) r.lr = POINT() self.assertEqual(r._objects, {'0': {}, '1': {}}) class ArrayTestCase(unittest.TestCase): def test_cint_array(self): INTARR = c_int * 3 ia = INTARR() self.assertEqual(ia._objects, None) ia[0] = 1 ia[1] = 2 ia[2] = 3 self.assertEqual(ia._objects, None) class X(Structure): _fields_ = [("x", c_int), ("a", INTARR)] x = X() x.x = 1000 x.a[0] = 42 x.a[1] = 96 self.assertEqual(x._objects, None) x.a = ia self.assertEqual(x._objects, {'1': {}}) class PointerTestCase(unittest.TestCase): def test_p_cint(self): i = c_int(42) x = pointer(i) self.assertEqual(x._objects, {'1': i}) class PointerToStructure(unittest.TestCase): 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] if __name__ == "__main__": unittest.main()
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