[PATCH v2 0/2] MR10102: win32u: Support real handles to the current process in NtUserGetProcessDpiAwarenessContext(), NtUserGetSystemDpiForProcess().

[Brendan Shanks (＠bshanks)]

I have a WPF application which calls `GetProcessDpiAwareness()` using a real handle to the current process.

--
  v2: win32u: Support real handles to the current process in NtUserGetSystemDpiForProcess().
      win32u: Support real handles to the current process in NtUserGetProcessDpiAwarenessContext().
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10102

[PATCH v2 1/2] win32u: Support real handles to the current process in NtUserGetProcessDpiAwarenessContext().

[Brendan Shanks]

From: Brendan Shanks <[e-mail]>

---
 dlls/user32/tests/sysparams.c | 7 +++++++
 dlls/win32u/sysparams.c       | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/dlls/user32/tests/sysparams.c b/dlls/user32/tests/sysparams.c
index 501d9afe5ea..ebf4bf7ca9e 100644
--- a/dlls/user32/tests/sysparams.c
+++ b/dlls/user32/tests/sysparams.c
@@ -4329,6 +4329,7 @@ static void test_dpi_context(void)
     DPI_AWARENESS_CONTEXT context;
     BOOL ret;
     UINT dpi;
+    HANDLE process;
     HDC hdc = GetDC( 0 );
 
     context = pGetThreadDpiAwarenessContext();
@@ -4375,6 +4376,12 @@ static void test_dpi_context(void)
     ret = pGetProcessDpiAwarenessInternal( GetCurrentProcess(), &awareness );
     ok( ret, "got %d\n", ret );
     ok( awareness == DPI_AWARENESS_SYSTEM_AWARE, "wrong value %d\n", awareness );
+    process = OpenProcess( PROCESS_QUERY_LIMITED_INFORMATION, FALSE, GetCurrentProcessId() );
+    ret = pGetProcessDpiAwarenessInternal( process, &awareness );
+    ok( ret, "got %d\n", ret );
+    ok( awareness == DPI_AWARENESS_SYSTEM_AWARE, "wrong value %d\n", awareness );
+    CloseHandle(process);
+
     SetLastError(0xdeadbeef);
     ret = pGetProcessDpiAwarenessInternal( (HANDLE)0xdeadbeef, &awareness );
     todo_wine
diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index ea477939eba..a5b7e6adbe6 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -7387,7 +7387,7 @@ ULONG WINAPI NtUserGetProcessDpiAwarenessContext( HANDLE process )
 {
     ULONG context;
 
-    if (process && process != GetCurrentProcess())
+    if (process && process != GetCurrentProcess() && NtCompareObjects( GetCurrentProcess(), process ))
     {
         WARN( "not supported on other process %p\n", process );
         return NTUSER_DPI_UNAWARE;
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/10102

[PATCH v2 2/2] win32u: Support real handles to the current process in NtUserGetSystemDpiForProcess().

[Brendan Shanks]

From: Brendan Shanks <[e-mail]>

---
 dlls/win32u/sysparams.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index a5b7e6adbe6..85e5df8e188 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -4765,7 +4765,7 @@ MONITORINFO monitor_info_from_window( HWND hwnd, UINT flags )
  */
 ULONG WINAPI NtUserGetSystemDpiForProcess( HANDLE process )
 {
-    if (process && process != GetCurrentProcess())
+    if (process && process != GetCurrentProcess() && NtCompareObjects( GetCurrentProcess(), process ))
     {
         FIXME( "not supported on other process %p\n", process );
         return 0;
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/10102

[Brendan Shanks (＠bshanks)]

On Fri Feb 13 20:15:19 2026 +0000, Brendan Shanks wrote:
> changed this line in [version 2 of the diff](/wine/wine/-/merge_requests/10102/diffs?diff_id=244918&start_sha=ba5ca5864f8ec4da8bae2530a2c66eae5cbd5231#85770a8b187bd82db4dbb9a2b8a5f34616049d0f_7390_7390)
> Ah yes thanks, that is much clearer.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10102#note_129654

[PATCH v2 0/2] MR10102: win32u: Support real handles to the current process in NtUserGetProcessDpiAwarenessContext(), NtUserGetSystemDpiForProcess(). - approved

[Rémi Bernon (＠rbernon)]

This merge request was approved by Rémi Bernon.
-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10102