Correction de arrplan.c
/* change la couleur d'arriere plan de la fenetre selon la lettre tapee n/b */
#include <stdio.h>
#include <X11/Xlib.h>
GC gc;
Display *display;
int screen;
Window win, root;
unsigned long white_pixel, black_pixel;
XSetWindowAttributes attrib;
unsigned long masq_attrib;
int nbre;
char chaine[20];
KeySym touche;
main() {
if ((display = XOpenDisplay ("")) == NULL) {
fprintf (stderr, "Can't open Display\n");
exit (1);
}
gc = DefaultGC (display, screen);
screen = DefaultScreen (display);
root = RootWindow (display, screen);
white_pixel = WhitePixel (display, screen);
black_pixel = BlackPixel (display, screen);
win = XCreateSimpleWindow (display, root,
0, 0, 100, 90, 2, black_pixel, white_pixel);
XSelectInput (display, win, ExposureMask | KeyPressMask);
XStoreName (display, win, "arrplan");
masq_attrib = CWBackPixel;
XMapWindow (display, win);
for (;;) {
XEvent ev;
XNextEvent (display, &ev);
switch (ev.type) {
case Expose :
XDrawString (display, win, gc, 10, 30, "coucou !", 8);
break;
case KeyPress :
nbre = XLookupString(&ev, chaine, 20, &touche, 0);
chaine[nbre] = 0;
if ((nbre == 1) && (chaine[0] == 'q'))
exit(0);
if (nbre == 1) {
if (chaine[0] == 'n')
attrib.background_pixel = black_pixel;
if (chaine[0] == 'b')
attrib.background_pixel = white_pixel;
XChangeWindowAttributes (display, win, masq_attrib, &attrib);
XClearWindow (display, win);
}
default :
break;
}
}
}