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gh-152433: Windows: _ctypes module: improve UWP compatibility #152792

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Merged
chris-eibl merged 2 commits into from
Sep 11, 2026
Merged

gh-152433: Windows: _ctypes module: improve UWP compatibility #152792

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491b2ae
gh-152433: Windows: ``_ctypes`` module: improve UWP compatibility
thexai Jul 1, 2026
784f304
LoadLibraryExW can be used on UWP from Windows SDK 10.0.22000.0
thexai Aug 4, 2026
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gh-152433: Windows: _ctypes module: improve UWP compatibility
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@thexai
thexai committed Jul 1, 2026
commit 491b2ae597c6abac4a983c0ca263a835e413440d
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Windows/2026-07-01-17-00-52.gh-issue-152433.kSd1bW.rst
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@@ -0,0 +1 @@
``_ctypes`` module: improve UWP compatibility.
9 changes: 7 additions & 2 deletions Modules/_ctypes/callproc.c
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Expand Up @@ -1082,8 +1082,7 @@ void _ctypes_extend_error(PyObject *exc_class, const char *fmt, ...)
}


#ifdef MS_WIN32

#ifdef MS_WINDOWS_DESKTOP
static PyObject *
GetComError(ctypes_state *st, HRESULT errcode, GUID *riid, IUnknown *pIunk)
{
Expand Down Expand Up @@ -1337,9 +1336,11 @@ PyObject *_ctypes_callproc(ctypes_state *st,

#ifdef MS_WIN32
if (iid && pIunk) {
#ifdef MS_WINDOWS_DESKTOP
if (*(int *)resbuf & 0x80000000)
retval = GetComError(st, *(HRESULT *)resbuf, iid, pIunk);
else
#endif
retval = PyLong_FromLong(*(int *)resbuf);
} else if (flags & FUNCFLAG_HRESULT) {
if (*(int *)resbuf & 0x80000000)
Expand Down Expand Up @@ -1417,10 +1418,14 @@ static PyObject *load_library(PyObject *self, PyObject *args)
return NULL;

Py_BEGIN_ALLOW_THREADS
#ifndef MS_WINDOWS_DESKTOP
hMod = LoadPackagedLibrary(name, 0);
#else
/* bpo-36085: Limit DLL search directories to avoid pre-loading
* attacks and enable use of the AddDllDirectory function.
*/
hMod = LoadLibraryExW(name, NULL, (DWORD)load_flags);
#endif
err = hMod ? 0 : GetLastError();
Py_END_ALLOW_THREADS

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