#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <locale.h>

Display *d;
Window w;
Screen s;

int main(void)
{
    XSizeHints *hints;
    XEvent evt;
    char s[80];
    XFontStruct *fontInfo;
    GC gc;
    XChar2b *ws;
    XSetWindowAttributes attr;
    int i, vis;

    setlocale(LC_ALL, "");

    d = XOpenDisplay(NULL);

    w = XCreateSimpleWindow(d, DefaultRootWindow(d), 100, 100,
	500, 375, 0, BlackPixel(d, 0), WhitePixel(d, 0));

    attr.event_mask = KeyPressMask | StructureNotifyMask;
    XChangeWindowAttributes(d, w, CWEventMask, &attr);
    XStoreName(d, w, "Draw String");

    if (! w) {
	printf("Error creating window!\n");
	exit(1);
    }

    hints = XAllocSizeHints();
    hints->flags = USPosition;
    hints->x = 100; hints->y = 100;
    XSetNormalHints(d, w, hints);
    XMapWindow(d, w);

    while(1) {
	while(XPending(d)) {
	    XNextEvent(d, &evt);
	    switch(evt.type) {
		case ConfigureNotify: {
		    XConfigureEvent *cevt = (XConfigureEvent *) &evt;
		    fprintf(stderr, "cevt->x: %d  cevt->y: %d\n",
			    cevt->x, cevt->y);
		}
		    break;
		case KeyPress:
		    exit(0);
		    break;
	    }
	}
	usleep(1000);
    }
}
.