numlock

[Thomas Chadwick]

>From: "J S" <vervoom@hotmail.com>
>Reply-To: cygwin-xfree@cygwin.com
>To: cygwin-xfree@cygwin.com
>Subject: Re: numlock
>Date: Sun, 18 Apr 2004 09:36:37 +0000

[snip]

>Thanks for your reply. Unfortunately our users' boxes are locked down 
>(they're on XP) so they wouldn't be able to edit that file. I was really 
>looking for a way to do this from the XFree startup script or configuration 
>anyway.

OK.  You asked for it.  Below is a short C program which will check the 
state of the NumLock key and synthesize a keydown/keyup sequence of the 
NumLock key if it's down.  Works on my box, which is Win2K, but I'm led to 
believe from the documentation that it should work with any 32-bit 
implementation of windows.

To build it, copy-paste the following source into a file (e.g. 
"numlockoff.c") then run gcc on it (e.g. "gcc -o numlockoff numlockoff.c").  
Then add that to a convenient location on your client systems and add a call 
to it in your X startup script.

#include <stdio.h>
#define _WIN32_WINNT 0x0500
#include <windows.h>

int main()
{
    INPUT pInput[2];

    if (GetKeyState(VK_NUMLOCK) == 1)
    {
        pInput[0].type           = INPUT_KEYBOARD;
        pInput[0].ki.wVk         = VK_NUMLOCK;
        pInput[0].ki.wScan       = 0;
        pInput[0].ki.dwFlags     = 0; /* Nill for keydown */
        pInput[0].ki.time        = 0;
        pInput[0].ki.dwExtraInfo = 0;

        pInput[1].type           = INPUT_KEYBOARD;
        pInput[1].ki.wVk         = VK_NUMLOCK;
        pInput[1].ki.wScan       = 0;
        pInput[1].ki.dwFlags     = KEYEVENTF_KEYUP;
        pInput[1].ki.time        = 0;
        pInput[1].ki.dwExtraInfo = 0;

        if (SendInput(2, pInput, sizeof(INPUT)) == 0)
        {
            fprintf(stderr, "Error: SendInput failed.  NumLock was not 
turned off.\n");
        }
    }
}

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