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Use Desktop Handle in case of no valid app HWND for QPrintDialog

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The call Win32 API PrintDlgEx needs in the PRINTDLGEX struct a valid
window handle for hwndOwner to show up. In case there is no window
created, as seen in the example, the call to PrintDlgEx fails with
COM error code E_HANDLE. Using the Desktop HWND, in case of no valid
app HWND creates a valid call to PrintDlgEx with showing up the dialog.

Pick-to: 6.6
Fixes: QTBUG-118899
Change-Id: Ie7009c8e6e8285a0b6312e310b3d065c532f9e17
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
This commit is contained in:
Wladimir Leuschner 2023-11-08 12:35:11 +01:00
parent 19aa21b595
commit 7e8ae9cf12
1 changed files with 6 additions and 1 deletions
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7
src/printsupport/dialogs/qprintdialog_win.cpp
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@ -101,7 +101,12 @@ static void qt_win_setup_PRINTDLGEX(PRINTDLGEX *pd, QWindow *parentWindow,
if (d->ep->printToFile)
pd->Flags |= PD_PRINTTOFILE;
pd->hwndOwner = parentWindow ? (HWND)QGuiApplication::platformNativeInterface()->nativeResourceForWindow("handle", parentWindow) : 0;
WId wId = parentWindow ? parentWindow->winId() : 0;
//QTBUG-118899 PrintDlg needs valid window handle in hwndOwner
//So in case there is no valid handle in the application,
//use the desktop as valid handle.
pd->hwndOwner = wId != 0 ? HWND(wId) : GetDesktopWindow();
pd->lpPageRanges[0].nFromPage = qMax(pdlg->fromPage(), pdlg->minPage());
pd->lpPageRanges[0].nToPage = (pdlg->toPage() > 0) ? qMin(pdlg->toPage(), pdlg->maxPage()) : 1;
pd->nCopies = d->printer->copyCount();