My program will either open a GUI or not depending on some commandline parameters. Right now I am instantiating QApplication for my main event loop, but noticed that my program aborts when run from a headless machine (missing xorg/xcb) unless i specify some environment variables to trick it into believing there is an xorg running.
When I instead instantiate QCoreApplication I don't have access to activeWindow(). The code requiring activeWindow() will never run in the cases when the program is run headless (that is the purose of the commandline parameters).
So what I am asking is, would it be possible to make QApplication run without problems even on a headless machine, and simply not show any GUI?
What are my other options?
No, this is not possible. But you can create QCoreApplication or QApplication in dependent from command line args.