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

main()
{
    //open a display
    Display *d = XOpenDisplay(0);

    if(d){
        //create a window
        Window w = XCreateWindow(d, DefaultRootWindow(d), 0, 0, 200,
            100, 0, CopyFromParent, CopyFromParent,
            CopyFromParent, 0, 0);

        char * key_string = "XF86AudioPlay";
        KeySym keysym = XStringToKeysym(key_string);
        KeyCode key = XKeysymToKeycode(d, XStringToKeysym(key_string));
        fprintf(stdout, "play keycode: %d", key);

        XGrabKey(d, key, AnyModifier, DefaultRootWindow(d), False,
                 GrabModeAsync, GrabModeAsync);

        //show the window
        XMapWindow(d,w);
        XFlush(d);

        XEvent report;
        XSelectInput(d, w, KeyPressMask);

        while(1){
            XNextEvent(d, &report);
            switch (report.type) {
                case KeyPress:
                    fprintf(stdout, "key event %d \n", 
                        report.xkey.keycode);
                    break;
                case Expose:
                    fprintf(stdout, "expose event\n");
                    break;
            }
        }
        //sleep(10);
    }

    return 0;
}