Low level Keyboard hook and keyboard synthesizes
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Thread: Low level Keyboard hook and keyboard synthesizes

  1. #1
    Join Date
    Dec 2003
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    Gods own country, India
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    Question Low level Keyboard hook and keyboard synthesizes

    Hi gurus,

    my problem is related to keyboard event synthesis on an application which uses low level keyboard hooking.

    application A uses LL hook to capture the function keys and posts messages to some windows when 'LLKHF_UP' is detected. It works fine when we press the function keys on keyboard.

    our application B ( is a kind of remote control app ) synthesizes the keyboard events using keybd_event function ( A and B runs in same machine )

    It seems that when using keybd_event, the hooked application never gets LLKHF_UP flag, instead it gets 'LLKHF_INJECTED' ( it is logical ). but why didn't it get the up event? [ up flag is set on the keybd_event fn ]

    I tried it with the windows virtual keyboard, which also displays the same behavior.

    Now is there ANY way to simulate the up flag in app A ?
    Please put some thoughts
    Thanks

  2. #2
    Join Date
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    Re: Low level Keyboard hook and keyboard synthesizes

    is the question vague?

  3. #3
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    Re: Low level Keyboard hook and keyboard synthesizes

    you need to generate the upkey events yourself via the keybd_event call.
    if you only generate down keys, you're only going to see injected down keys as well.


    See the dwFlags member in keybd_event() (http://msdn.microsoft.com/en-us/library/aa928103.aspx)

  4. #4
    Join Date
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    Re: Low level Keyboard hook and keyboard synthesizes

    Thanks for the reply

    The up key event is generated, but is not captured by the hooked app. only down event is captured.

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