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Asked: 2026-06-12T07:46:27+00:00

I’ve been looking into low level keyboard hooks lately. I have already got mine

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I’ve been looking into low level keyboard hooks lately. I have already got mine working but I have some questions on the code.

I see there is a complete code for Console application here:
http://blogs.msdn.com/b/toub/archive/2006/05/03/589423.aspx

In the Main function, I see the programmer called a “UnhookWindowsHookEx” DLL function. What is the purpose of this function and what would happen if it is commented out? (Bad consequences especially?)

EDIT:

And one more thing. Why must “Application.Run()” be called in order for the code to work?

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1 Answer

  1. Editorial Team

    1. In this particular case, if UnhookWindowsHookEx is commented, nothing bad happens, because the program exits anyway. But it is a good idea to close any resource when it is not required anymore, both when the program continues executing, and in the end of the program – to keep resources usage under the control.

    2. Without Application.Run the program exits immediately. The second reason for using Application.Run is SetWindowsHookEx requirement – it needs message loop to work. Application.Run executes the message loop. Program may be stopped by pressing Ctrl+C.

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