C++ Fenster unter Linux (Funktionsweise)

[sniper_w]

Zitat:

Genau, ein X-Server stellt nur Zugriffsmöglichkeiten auf Ein-/Ausgabe und Funktionen zum Zeichnen von graphischen Primitiven und Schrift zur Verfügung.

Nich nur.

Code:

The following program creates a window with a little black square in it.

 /*
   Simple Xlib application drawing a box in a window.
 */

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

 int main() {
   Display *d;
   int s;
   Window w;
   XEvent e;

                        /* open connection with the server */
   d=XOpenDisplay(NULL);
   if(d==NULL) {
     printf("Cannot open display\n");
     exit(1);
   }
   s=DefaultScreen(d);

                        /* create window */
   w=XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
                         BlackPixel(d, s), WhitePixel(d, s));

                        /* select kind of events we are interested in */
   XSelectInput(d, w, ExposureMask | KeyPressMask);

                        /* map (show) the window */
   XMapWindow(d, w);

                        /* event loop */
   while(1) {
     XNextEvent(d, &e);
                        /* draw or redraw the window */
     if(e.type==Expose) {
       XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
     }
                        /* exit on key press */
     if(e.type==KeyPress)
       break;
   }

                        /* close connection to server */
   XCloseDisplay(d);

   return 0;
 }

Xlib