Can I create a QApplication inside a DLL?

[fullmetalcoder]

why would you need to mix Qt and MFC/WinAPI ??? Are you sure you're working on the best design??? Your approach seems an overkill and AFAIK the only way to check if a dll uses Qt is to doit on your own by creating an exported function/variable and looking for it in the exported symbols of the dll... And that is an suicide as well!

[Elder Orb]

It's not my decision to mix Qt and mfc. I simply have to do it. Anyway the problem was solved. I've exported function "init()" which must be called before dll using.