Linux, how to capture screen, and simulate mouse movements

Question

I need to capture screen (as print screen) in the way so I can access pixel color data, to do some image recognition, after that I will need to generate mouse events on the

Answer 1

I couldn't get the clicking working with the method @axiom used, only movement of the pointer. I used this instead: (Ubuntu 18.04).

Compiles with: g++ mouse_click.cpp -lX11 -lXtst -lstdc++

#include
#include
#include 
#include 

#include 

#include 
#include 
#include 


void mouseClick(int button)
{
    Display *display = XOpenDisplay(NULL);

    // click left button
    XTestFakeButtonEvent(display, Button1, true, 0);
    XFlush(display);

    usleep(10000);

    // release left mouse
    XTestFakeButtonEvent(display, Button1, false, 0);
    XFlush(display);


    XCloseDisplay(display);


}
int main(int argc,char * argv[]) {

    int x , y;
    x=atoi(argv[1]);
    y=atoi(argv[2]);
    Display *display = XOpenDisplay(0);

    Window root = DefaultRootWindow(display);
    XTestFakeMotionEvent(display, root, x, y, 0);
    XFlush(display);
    mouseClick(Button1);
    XFlush(display);
    XCloseDisplay(display);
    return 0;
}