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Locking the keaboard

Posted on 1998-10-14
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Last Modified: 2013-11-20
I want to lock my keyboard, but a few keys that will
remain activate.
(working with VC5 - MFC)
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Question by:LilachH
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3 Comments
 
LVL 86

Accepted Solution

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jkr earned 600 total points
ID: 1323289
Well, the only way to totally 'control' any keyboard related events is to use a system wide message hook (see 'SetWindowsHookEx()' and 'WH_GETMESSAGE', the hook has to reside in a DLL), e.g.:

LRESULT CALLBACK HookProc   (   int     nCode,  // hook code
                                WPARAM  wParam, // removal flag
                                LPARAM  lParam  // address of structure with message
                            )
{
    PMSG    pmsg    =   ( PMSG) lParam;
    MSG     msg;

    if  (   0   >   nCode   ||  PM_NOREMOVE ==  wParam)
        {
            return  (   CallNextHookEx  (   g_hhk,
                                            nCode,
                                            wParam,
                                            lParam
                                        )
                    );
        }

    if  (   /* ... check whether it's a mouse message */
            PeekMessage (   &msg,
                            pmsg->hwnd,
                            WM_KEYFIRST,
                            WM_KEYLAST,
                            PM_NOREMOVE
                        )
        )
        {
/* this one is for us, so check key state */
if ( 0x80000000 & GetKeyState(VK_LMENU)
     && 0x80000000 & GetKeyState(VK_CONTROL)
            )
            {
            
            /* appropriate action, e.g. suppress msg by removing it /*
            PeekMessage (   &msg,
                            pmsg->hwnd,
                            WM_MOUSEFIRST,
                            WM_MOUSELAST,
                            PM_REMOVE
                        );
           }
        }

 
}

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Author Comment

by:LilachH
ID: 1323290
I need more information.
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LVL 86

Expert Comment

by:jkr
ID: 1323291
What kind of information do you need?
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