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Intercepting WM_ACTIVATE message for any window (detecting activation with hooks/subclassing)

vanveghj asked
Last Modified: 2012-06-27

i currently need to detect when a certain application's window is activated and deactivated.  this is a 3rd party window, not one that is part of my vb.net project.  i have read a bit about hooks and subclassing, but i have not seen a concrete example of this in vb.net.  i would basically like to do what Spy++ does for message logging.  i can get the window's basic attributes like hWnd just fine.  i am just having problem's hooking into the messages.  i have successfully written code which intercepts messages from my own forms, but when i try to use a 3rd party window, i am unsuccessful.  the APIs i have been using are SetWindowLong and CallWindowProc.  please advise.

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