winapi - C++ how to break message loop in windows hook

Question

I need to break the message loop in win32 keyboard hook. The loop look like this,

MSG msg;
    while (GetMessage(&msg, NULL, NULL, NULL))  
    {
        TranslateMessage(&msg); 
        DispatchMessage(&msg);
    }

I used unhook method but it doesn't work. and I have another Question that if I change while loop parameter to !GetMessage it work same as before. and if I add printf inside that while loop its not printing anything. I just want to make a dll for keyboard hook. and method in dll need to end. with this(message loop) I cant end(or return something) that method.

Sorry for my bad English.

Thanks.

Answer 1

Use a PostQuitMessage(0) to break the prodecure. You can put it in your window procedure, for example, in the WM_DESTROY message comes.