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detecting input

Posted on 2002-07-12
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hi..
how will i able to detect keyboard and mouse input every moment using a program running in the background..?
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Question by:prinx
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jimbucci earned 50 total points
ID: 7148635
Assuming you are running on a Windows OS:
You will need to create a system keyboard and mouse hook.

From the MSDN:
WH_KEYBOARD Hook
The WH_KEYBOARD hook enables an application to monitor message traffic for WM_KEYDOWN and WM_KEYUP messages about to be returned by the GetMessage or PeekMessage function. You can use the WH_KEYBOARD hook to monitor keyboard input posted to a message queue.

For more information, see the KeyboardProc function.

WH_MOUSE Hook
The WH_MOUSE hook enables you to monitor mouse messages about to be returned by the GetMessage or PeekMessage function. You can use the WH_MOUSE hook to monitor mouse input posted to a message queue.

For more information, see the MouseProc function.

Look at SetWindowsHookEx().

There are examples in the MSDN for how to install and use hooks.
I hope this helps.
Jim

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by:prinx
ID: 7148946
den it is possible to intercept the messages for eg..stopping particular keydown event from being handled by its app ?
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Author Comment

by:prinx
ID: 7148948
den it is possible to intercept the messages for eg..stopping particular keydown event from being handled by its app ?
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Author Comment

by:prinx
ID: 7148950
den it is possible to intercept the messages for eg..stopping particular keydown event from being handled by its app ?
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Author Comment

by:prinx
ID: 7148951
den it is possible to intercept the messages for eg..stopping particular keydown event from being handled by its app ?
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Author Comment

by:prinx
ID: 7148952
den it is possible to intercept the messages for eg..stopping particular keydown event from being handled by its app ?
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by:jimbucci
ID: 7148998
From what I remember about hooks - your hook gets the message and determines what to do with.  It can throw it away thus preventing the app from getting the message, or pass it on to the next hook in the chain - which would probably be the system hook.  If it passes it on the app would get the message.
So, the answer is yes.
Jim
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