C++: Is there a way to grab the HWND of the main window of an application by PID?
by 
ArcyQwerty
ANSWERS: 1
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I realize the question is old, but as far as I know the only way to do this is to enumerate the windows, retrieve the owner PID for each one, and compare it with your target PID. The problem is twofold: there's really no such thing as "the main window of an application"... that's a customary practice, not a design requirement of Windows. The other is that it's not such a common need to inquire about Windows of other apps, so I think MS just didn't feel obliged to invest much in making that convenient.
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