xleds.c

Linux下的一个用于控制xwindow下的numlock键及caps键开/关的程序,用于工控行业.

/* Xleds.c
 *
 * Copyright (C) 2000 Michael McTernan  [e-mail]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <stdio.h>
#include <sys/syslog.h>
#include <X11/extensions/XTest.h>
#include <X11/keysym.h>


static Display *theDisplay=NULL;

/* Prototype */
void setLeds(int num,int caps,int scr);
static void set(int led,int mode);


int main() {

  /* Attempt to open the default display */
  if((theDisplay=XOpenDisplay(NULL))==NULL) {
    syslog(LOG_ERR,"Failed to open display.");
    fprintf(stderr,"Failed to open display.");
  }

  setLeds(1,0,0);
  sleep(1);
  setLeds(0,1,0);
  sleep(1);
  setLeds(0,0,1);
  sleep(1);
  setLeds(0,1,0);
  sleep(1);
  setLeds(1,0,0);

}


void setLeds(int num,int caps,int scr) {

  printf("%d %d %d\n",num,caps,scr);

  if(num)
    set(1,LedModeOn);
  else
    set(1,LedModeOff);

  if(caps)
    set(2,LedModeOn);
  else
    set(2,LedModeOff);

  if(scr)
    set(3,LedModeOn);
  else
    set(3,LedModeOff);

  XSync(theDisplay,False);
}


/*set*/
/* Sets led to mode
 */
static void set(int led,int mode) {
  XKeyboardControl values;

  values.led=led;  
  values.led_mode=mode;
 
  XChangeKeyboardControl(theDisplay, KBLedMode,&values);
}