Moving the mouse cursor doesn't work as expected on X11

Question

I'm trying to move the mouse pointer while the left button is down (Button1). But it doesn't work. For example, if I launch GIMP, I see a dot (cursor down), then the cursor moves but without drawing. I was expecting to see a drawn line (move while holding left button down).

Display * display = XOpenDisplay(0);
XEvent event;
memset (&event, 0, sizeof (event));
event.xbutton.button = Button1;
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, 0xFFF, &event) == 0)
fprintf (stderr, "Error to send the event!\n");

XFlush (display);

// Move
XWarpPointer(display, None, 0, 0, 0, 0, 0, 50, 50);

XFlush (display);

// Release
event.type = ButtonRelease;
event.xbutton.state = 0x100;

if (XSendEvent (display, PointerWindow, True, 0xFFF, &event) == 0)
fprintf (stderr, "Error to send the event!\n");

XFlush (display);

What am I doing wrong?

Thanks!

Nicolas.

Answer 1

使用XTest扩展库来伪造用户输入事件。