Simulate QKeyEvent on Whatever Widget InFocus

I want to Simulate a QKeyEvent on the Currently Focused Widget. That widget Might not belong to My Application even the widget may not be an Qt Widget at all. I just want to Simulate a QKeyEvent On Whatever Widget In Focus now.

I've tried QApplication::postEvent(DG::Util::_desktopWidget, ev); Where DG::Util::_desktopWidget is the Primary D开发者_StackOverflow社区esktop Widget

QDesktopWidget* desktopWidget = new QDesktopWidget;
DG::Util::_desktopWidget = desktopWidget->screen(desktopWidget->primaryScreen());

But This doesn't work.

With Qt you can only control widgets belonging to your app. Therefore you can't send QKeyEvent to non-Qt apps, or Qt apps which are different processes.