Mouse simulating movement and click

At @pan64 recomandation I open this new tread for my request.
I found here a nice code for simulating mouse movement and click without using additional Linux tools installed.

Code:#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);
}

// 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;
}

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

// Move mouse pointer (absolute)
void
move_to (Display *display, int x, int y)
{
int cur_x, cur_y;
coords (display, &cur_x, &cur_y);
XWarpPointer (display, None, None, 0,0,0,0, -cur_x, -cur_y);
XWarpPointer (display, None, None, 0,0,0,0, x, y);
usleep (1);
}

// 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;
}I compiled with:
Code:gcc -o autoclick autoclick.c -lX11I tried run and I get:

./autoclick 50, 50, 1
Starting in 3 2 1...

and that it's all. I try change the coordinates but nothing happen or button.
What I do wrong?