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Windows QPA: Fix crash in some rare cases

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For the WM_SETTINGCHANGE message, lParam sometimes may be NULL [1]
and that will lead to crash without extra safe guard.

Amends commit qtbase/1ed449e168af133184633d174fd7339a13d1d595

[1] https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-settingchange

Change-Id: Ibd1e94b4c1d7882db0719c31a66a5fcc9299c3bd
Reviewed-by: Nodir Temirkhodjaev <nodir.temir@gmail.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Yuhang Zhao 2022-05-08 21:35:05 +08:00
parent 741afd6752
commit 71322ef361
1 changed files with 2 additions and 1 deletions
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3
src/plugins/platforms/windows/qwindowscontext.cpp
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@ -1138,7 +1138,8 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
case QtWindows::SettingChangedEvent: {
QWindowsWindow::settingsChanged();
// Only refresh the window theme if the user changes the personalize settings.
if (wParam == 0 && wcscmp(reinterpret_cast<LPCWSTR>(lParam), L"ImmersiveColorSet") == 0) {
if ((wParam == 0) && (lParam != 0) // lParam sometimes may be NULL.
&& (wcscmp(reinterpret_cast<LPCWSTR>(lParam), L"ImmersiveColorSet") == 0)) {
const bool darkMode = QWindowsTheme::queryDarkMode();
if (darkMode != QWindowsContextPrivate::m_darkMode) {
QWindowsContextPrivate::m_darkMode = darkMode;