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Support Python 3.15 PyCArgObject struct layout changes. #963

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Merged
junkmd merged 2 commits into from
Oct 11, 2026
Merged

Support Python 3.15 PyCArgObject struct layout changes. #963

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f0c3c93
test: Remove temporary skip logic for Python 3.15 in `test_util.py`
junkmd Oct 9, 2026
ded3f00
fix: Update `PyCArgObject` layout for Python 3.15.
junkmd Oct 9, 2026
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17 changes: 1 addition & 16 deletions comtypes/test/test_util.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
import sys
import unittest
from ctypes import (
POINTER,
Expand All @@ -14,21 +13,7 @@
sizeof,
)

PY_3_15 = sys.version_info.major == 3 and sys.version_info.minor == 15

try:
import comtypes.util
except RuntimeError as e:
SKIP_MSG = (
"Starting from Python 3.15, PyCArgObject layout is changed. "
"See https://github.com/enthought/comtypes/issues/938."
)
if PY_3_15:

def setUpModule():
raise unittest.SkipTest(SKIP_MSG)
else:
raise e
import comtypes.util
from comtypes import GUID, CoCreateInstance, IUnknown, shelllink


Expand Down
13 changes: 11 additions & 2 deletions comtypes/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,15 @@
byref,
c_byte,
c_char,
c_char_p,
c_double,
c_float,
c_int,
c_long,
c_longdouble,
c_longlong,
c_short,
c_ssize_t,
c_void_p,
cast,
sizeof,
Expand All @@ -32,6 +34,13 @@
_T = TypeVar("_T")
_CT = TypeVar("_CT", bound="_CData")

if sys.version_info >= (3, 15):
_TAG_TYPE = c_char_p
_SIZE_TYPE = c_ssize_t
else:
_TAG_TYPE = c_char
_SIZE_TYPE = c_int


def _calc_offset():
# Internal helper function that calculates where the object
Expand Down Expand Up @@ -103,10 +112,10 @@ class value(Union):
_fields_ = [
("PyObject_HEAD", c_byte * object.__basicsize__),
("pffi_type", c_void_p),
("tag", c_char),
("tag", _TAG_TYPE),
("value", value),
("obj", c_void_p),
("size", c_int),
("size", _SIZE_TYPE),
]

_anonymous_ = ["value"]
Expand Down
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