gistfile1.c

// Written by Pioz.
// Compile with: gcc -o autoclick autoclick.c -lX11

#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>

// Simulate mouse click
void
click (Display *display, int button)
{
  // Create and setting up the event
  XEvent event;
  memset (&event, 0, sizeof (event));
  event.xbutton.button = button;
  event.xbutton.same_screen = True;
  event.xbutton.subwindow = DefaultRootWindow (display);
  while (event.xbutton.subwindow)
    {
      event.xbutton.window = event.xbutton.subwindow;
      XQueryPointer (display, event.xbutton.window,
		     &event.xbutton.root, &event.xbutton.subwindow,
		     &event.xbutton.x_root, &event.xbutton.y_root,
		     &event.xbutton.x, &event.xbutton.y,
		     &event.xbutton.state);
    }
  // Press
  event.type = ButtonPress;
  if (XSendEvent (display, PointerWindow, True, ButtonPressMask, &event) == 0)
    fprintf (stderr, "Error to send the event!\n");
  XFlush (display);
  usleep (1);
  // Release
  event.type = ButtonRelease;
  if (XSendEvent (display, PointerWindow, True, ButtonReleaseMask, &event) == 0)
    fprintf (stderr, "Error to send the event!\n");
  XFlush (display);
  usleep (1);
}

// Move mouse pointer
void
move (Display *display, int x, int y)
{
  XWarpPointer (display, None, None, 0,0,0,0, x, y);
  XFlush (display);
  usleep (1);
}

// Get mouse coordinates
void
coords (Display *display, int *x, int *y)
{
  XEvent event;
  XQueryPointer (display, DefaultRootWindow (display),
                 &event.xbutton.root, &event.xbutton.window,
                 &event.xbutton.x_root, &event.xbutton.y_root,
                 &event.xbutton.x, &event.xbutton.y,
                 &event.xbutton.state);
  *x = event.xbutton.x;
  *y = event.xbutton.y;
}

// Get pixel color at coordinates x,y
void
pixel_color (Display *display, int x, int y, XColor *color)
{
  XImage *image;
  image = XGetImage (display, DefaultRootWindow (display), x, y, 1, 1, AllPlanes, XYPixmap);
  color->pixel = XGetPixel (image, 0, 0);
  XFree (image);
  XQueryColor (display, DefaultColormap(display, DefaultScreen (display)), color);
}

// START HERE
int
main (int argc, char *argv[])
{ 
  int starting = 3;
  int x = 0;
  int y = 0;

  // Open X display
  Display *display = XOpenDisplay (NULL);
  if (display == NULL)
    {
      fprintf (stderr, "Can't open display!\n");
      return -1;
    }
  
  // Wait 3 seconds to start
  printf ("Starting in   ");
  fflush (stdout);
  while (starting > 0)
    {
      printf ("\b\b\b %d...", starting);
      fflush (stdout);
      sleep (1);
      starting--;
    }
  printf ("\n");

  // Start
  while (1)
    {
      click (display, Button1);
      //move (display, x, y);
      //coords (dispaly, &x, &y);
      sleep (1);
    }

  // Close X display and exit
  XCloseDisplay (display);
  return 0;
}