Sample Use of HP Input Extensions

/************************************************************************
 *
 * File: hpinput.c
 *
 * Sample program to access input devices other than the X pointer and
 * keyboard using the HP extension to X.
 * This program creates a window and selects input from it.
 * To terminate this program, press button 1 on any device being accessed
 * through the extension.
 *
 * To compile this program, use
 * "cc hpinput.c I/usr/include/X11R5 -L/usr/lib/X11R5
 * -lXhp11 -lX11 -o hpinput
 */
 
#include <X11/Xlib.h>
#include <X11/XHPlib.h>
#include "stdio.h"
 
main()
    {
    Display  *display;
    XHPDeviceList  *list, *slist;
    int   i, ndevices, devkeyp, devbutp;
    Window  my;
    XEvent  event;
    Mask  mask, tmask;
    XHPDeviceButtonEvent *b;
 
    if ((display = XOpenDisplay ("")) == NULL)
 {
 printf ("No connection to server - Terminating.\n");
 exit(1);
 }
    my = XCreateSimpleWindow (display, RootWindow(display,0), 100, 100,
 100, 100, 1, BlackPixel(display,0), WhitePixel(display,0));
    XMapWindow (display, my);
    XSync(display,0);
    XHPGetExtEventMask (display, HPDeviceKeyPressreq, &devkeyp, &mask);
    XHPGetExtEventMask (display,HPDeviceButtonPressreq,&devbutp,&tmask);
    mask |= tmask;
    slist = list = XHPListInputDevices (display, &ndevices);
    for (i=0; i<ndevices; i++, list++)
 {
 printf ("\nDevice %s has %d keys and %d buttons\n",
     list->name,list->num_keys,list->num_buttons);
 if (list->x_id != XPOINTER &&list->x_id != XKEYBOARD)
     {
         XHPSetInputDevice (display, list->x_id, (ON | DEVICE_EVENTS));
     XHPSelectExtensionEvent (display, my, list->x_id, mask);
     }
 }
    for (;;)
 {
 XNextEvent (display,&event);
 if (event.type == devkeyp)
     printf ("Device key press event device=%d\n",
         ((XHPDeviceKeyEvent * ) &event)->deviceid);
 else if (event.type == devbutp)
     {
     b = (XHPDeviceButtonEvent * ) &event;
     printf ("Device button press event device=%d\n", b->deviceid);
     if (b->ev.button==1)
  {
  for (i=0,list=slist; i<ndevices; i++,list++)
      if (list->x_id != XPOINTER &&list->x_id != XKEYBOARD)
   XHPSetInputDevice (display, list->x_id, OFF);
  break;
  }
     }
 }
    XHPFreeDeviceList (slist);
    }