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gh-127183: Add _ctypes.CopyComPointer tests #127184

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Merged
encukou merged 5 commits into from
Nov 25, 2024
Merged

gh-127183: Add _ctypes.CopyComPointer tests #127184

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f3e7afb
Make `create_shelllink_persist` top level function.
junkmd Nov 23, 2024
c28e7c4
Add `CopyComPointerTests`.
junkmd Nov 23, 2024
79f7055
Add more tests.
junkmd Nov 23, 2024
638487b
Update tests.
junkmd Nov 24, 2024
a9d2805
Add assertions for `Release`'s return value.
junkmd Nov 25, 2024
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Add CopyComPointerTests.
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@junkmd
junkmd committed Nov 24, 2024
commit c28e7c45265781dc9cad8c941ed4214884ea6717
41 changes: 40 additions & 1 deletion Lib/test/test_ctypes/test_win32_com_foreign_func.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
raise unittest.SkipTest("Windows-specific test")


from _ctypes import COMError
from _ctypes import COMError, CopyComPointer
from ctypes import HRESULT


Expand Down Expand Up @@ -184,5 +184,44 @@ class IPersist(IUnknown):
self.assertEqual(0, ppst.Release())


class CopyComPointerTests(unittest.TestCase):
def setUp(self):
ole32.CoInitializeEx(None, COINIT_APARTMENTTHREADED)

def tearDown(self):
ole32.CoUninitialize()
gc.collect()

def test_copy_com_pointer(self):
class IUnknown(c_void_p):
QueryInterface = proto_query_interface(None, IID_IUnknown)
AddRef = proto_add_ref()
Release = proto_release()

class IPersist(IUnknown):
GetClassID = proto_get_class_id(((OUT, "pClassID"),), IID_IPersist)

src = create_shelllink_persist(IPersist)
dst = IPersist()

self.assertIsNone(dst.value)
with self.assertRaises(ValueError):
dst.GetClassID() # NULL COM pointer access

hr = CopyComPointer(src, byref(dst))

self.assertEqual(S_OK, hr)
self.assertEqual(dst.value, src.value)

clsid = dst.GetClassID()
self.assertEqual(TRUE, is_equal_guid(CLSID_ShellLink, clsid))

# The refcount of a COM pointer created by `CoCreateInstance` is 1.
# `CopyComPointer` calls `AddRef` internally (thus, +1 to the refcount).
# Here, the refcount is decremented from 2 to 1.
self.assertEqual(1, dst.Release())
self.assertEqual(0, src.Release())


if __name__ == '__main__':
unittest.main()