some keyboard/mouse events do not come back-xlib programming

[hamedhsn]

hi ..
i have a problem with this program ,it lists the current window along with window id thet are running on the system,result is that for a particular window id that i enter i got odd result:
for application like firefox or gedit just motion notify event works,non of the other events work??
for my terminal(bash) everything works,key press,keyrelease,mouse notify,mouserelease,...
i dont know why??

//yhis part get the window id

        Display * dis;
        Window w;
        dis = XOpenDisplay (0);
        w=XDefaultRootWindow(dis);
        Atom a = XInternAtom(dis, "_NET_CLIENT_LIST" , 1);
        Atom actualType;
        int format;
        unsigned long numItems, bytesAfter;
        unsigned char *data =0;
        int status = XGetWindowProperty(dis,w,a,0L,(~0L),0,AnyPropertyType,&actualType,&format,&numItems,&bytesAfter,&data);

        if (status >= Success && numItems)
        {
                int *array = (int*) data;
                int k;
                for (k = 0; k < numItems; k++)
                {
                        // get window Id:
                        Window w = (Window) array[k];
                        XSelectInput (dis, w, KeyPressMask |PointerMotionMask |ButtonReleaseMask);
                        char* name = '\0';
                        status = XFetchName(dis, w, &name);
                        if (status >= Success)
                        {
                                printf("Found: %u  %s\n", w, name);
                         }
                        XFree(name);
    
                }
                XFree(data);
        }

//Event handling for windows

   
   XEvent event;
     while (1)  {
     XNextEvent(dis, &event);
     switch  (event.type) {
          
            //MOUSE LOCATION
            case MotionNotify:
                fprintf(stdout,"x: %d y:%d\n",event.xmotion.x,event.xmotion.y);
            break;    
            
            //KEYBOARD KEY(it does not wok)        
            case KeyPress:
                      fprintf(stdout,"key: %d \n",event.xkey.keycode);
            break;
            //--------------------------------
           

            //KEYBOARD KEY(it does not wok)        
            case KeyRelease:
                     fprintf(stdout,"key: %d \n",event.xkey.keycode);
            break;
            //--------------------------------
           
            case ButtonRelease:
                //show which button is released
                if (event.xbutton.button==1)
                    fprintf(stdout,"mouse left click");
                if (event.xbutton.button==2)
                    fprintf(stdout,"middle left click");
                if (event.xbutton.button==3)
                    fprintf(stdout,"mouse right click");
            break;                
            
        }
    }
}

[Rubberman]

Please enclose your code in

// This is some code.

blocks. It will preserve indentations and such, making it a lot easier to read your code.

[hamedhsn]

Please enclose your code in

// This is some code.

blocks. It will preserve indentations and such, making it a lot easier to read your code.

Done

[Rubberman]

It is a permissions problem. There are certain events you cannot intercept by default on windows other than your own. This is a security issue and one that should not lightly (or easily) be bypassed. For example, if you could intercept key press/release events, you have the foundation of a keylogger.