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Block a pressed keyboard button

Posted on 2011-02-11
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Last Modified: 2013-12-17
Hi Experts

Need some help here please. I have an application that forwards my keyboard button press events to other events. I'm using a keyboard global hook to detect user key stokes and return something else.
Eventually it's a macro program. For example user hits "2" on the keyboard and "Hello" is returned.

My problem is that I cannot get rid of that "2" itself. Instead of "Hello" - "2Hello" is returned.
How can I block the selected key from being returned to the user ? I need only "Hello" to be returned.

Thank you.
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Question by:techsuppoprt
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Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 1600 total points
ID: 34875888
"I'm using a keyboard global hook"

In your hook callback method, instead of executing CallNextHookEx(), you simply immediately exit by returning true:

    // when key you want to suppress is encountered:
    return true;

This will suppress the keystroke.  You may need to do this for both WM_KEYDOWN and WM_KEYUP for the target key.
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Author Comment

by:techsuppoprt
ID: 34903014
Hmmm , did it but now it doesn't return any keys at all.
Keyboard's just not responding unless I hit the trigger that starts my macro.
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 34903202
If you return true for ALL keystrokes then your keyboard won't respond anymore.   =\

What you need to do is return true ONLY for the number "2" so that only the number "2" is consumed.
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by:techsuppoprt
ID: 34912355
Thanks.
I should've mentioned that this is actually what I'm using:

http://www.codeproject.com/KB/cs/globalhook.aspx

So extra digging is required , it's not exactly what you're saying :)
Let me see....brb!
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Accepted Solution

by:
Mike Tomlinson earned 1600 total points
ID: 34912478
Gotcha...in the FAQs from that page:

Question

I need to suppress some keystrokes after I have processed them.

Answer

Just set the e.Handled property to true in the key events you have processed. It prevents the keystrokes being processed by other applications.
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Author Comment

by:techsuppoprt
ID: 34917898
Yup, I got it, thank you!
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