Does QFileOpenEvent supported on Windows? If no, how can I achieve it?

[JackMyson]

I am currently developing an application on Windows, but my deployment target is to be cross-platform. I know that I can sub-class QApplication and override its event method to detect the QFileOpenEvent, but the docs said that this class works on macOS only. So what's the method to detect the similar features on Windows (and even better, Linux/X11)?

I know someone had raised a Qt Bug (for example #2222) but it seems no one has commented on the bug and fixed it.

For your reference, after I had built the detection mechanism by using the QStringList QCoreApplication(int &argc, char *argv[]).arguments() method, Windows file manager explorer.exe starts a whole new process that is independent from the already-has(ve)-opened window(s) processes, resulting in a whole new sub-classed QApplication instance inducing qApp->closeAllWindows() only closes a part of all the opened windows which theoretically all should be treated as a single application.

I once thought that this was impossible as the Kate text editor by KDE, which also uses the Qt, has also encountered the exactly same problem. I am still wondering if this is possible.

Any help will be greatly appreciated! Thanks.

[Christian Ehrlicher]

If you want only a single instance of your application running you should take a look at QtSingleApplication