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43 lines
1023 B
43 lines
1023 B
import unittest
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from ctypes import *
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################################################################
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#
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# The incomplete pointer example from the tutorial
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#
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class MyTestCase(unittest.TestCase):
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def test_incomplete_example(self):
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lpcell = POINTER("cell")
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class cell(Structure):
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_fields_ = [("name", c_char_p),
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("next", lpcell)]
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SetPointerType(lpcell, cell)
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c1 = cell()
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c1.name = b"foo"
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c2 = cell()
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c2.name = b"bar"
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c1.next = pointer(c2)
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c2.next = pointer(c1)
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p = c1
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result = []
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for i in range(8):
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result.append(p.name)
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p = p.next[0]
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self.assertEqual(result, [b"foo", b"bar"] * 4)
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# to not leak references, we must clean _pointer_type_cache
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from ctypes import _pointer_type_cache
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del _pointer_type_cache[cell]
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################################################################
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if __name__ == '__main__':
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unittest.main()
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