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# This tests the internal _objects attribute
import unittest
from ctypes import *
from sys import getrefcount as grc
# XXX This test must be reviewed for correctness!!!
# ctypes' types are container types.
#
# They have an internal memory block, which only consists of some bytes,
# but it has to keep references to other objects as well. This is not
# really needed for trivial C types like int or char, but it is important
# for aggregate types like strings or pointers in particular.
#
# What about pointers?
class ObjectsTestCase(unittest.TestCase):
def assertSame(self, a, b):
self.assertEqual(id(a), id(b))
def test_ints(self):
i = 42000123
refcnt = grc(i)
ci = c_int(i)
self.assertEqual(refcnt, grc(i))
self.assertEqual(ci._objects, None)
def test_c_char_p(self):
s = b"Hello, World"
refcnt = grc(s)
cs = c_char_p(s)
self.assertEqual(refcnt + 1, grc(s))
self.assertSame(cs._objects, s)
def test_simple_struct(self):
class X(Structure):
_fields_ = [("a", c_int), ("b", c_int)]
a = 421234
b = 421235
x = X()
self.assertEqual(x._objects, None)
x.a = a
x.b = b
self.assertEqual(x._objects, None)
def test_embedded_structs(self):
class X(Structure):
_fields_ = [("a", c_int), ("b", c_int)]
class Y(Structure):
_fields_ = [("x", X), ("y", X)]
y = Y()
self.assertEqual(y._objects, None)
x1, x2 = X(), X()
y.x, y.y = x1, x2
self.assertEqual(y._objects, {"0": {}, "1": {}})
x1.a, x2.b = 42, 93
self.assertEqual(y._objects, {"0": {}, "1": {}})
def test_xxx(self):
class X(Structure):
_fields_ = [("a", c_char_p), ("b", c_char_p)]
class Y(Structure):
_fields_ = [("x", X), ("y", X)]
s1 = b"Hello, World"
s2 = b"Hallo, Welt"
x = X()
x.a = s1
x.b = s2
self.assertEqual(x._objects, {"0": s1, "1": s2})
y = Y()
y.x = x
self.assertEqual(y._objects, {"0": {"0": s1, "1": s2}})
## x = y.x
## del y
## print x._b_base_._objects
def test_ptr_struct(self):
class X(Structure):
_fields_ = [("data", POINTER(c_int))]
A = c_int*4
a = A(11, 22, 33, 44)
self.assertEqual(a._objects, None)
x = X()
x.data = a
##XXX print x._objects
##XXX print x.data[0]
##XXX print x.data._objects
if __name__ == '__main__':
unittest.main()
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