Hello,
I was recently trying to write a C application that used XLib following an example. The app looked like this:
Code:
/*
Simple Xlib application drawing a box in a window.
gcc input.c -o output -lX11
*/
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void) {
Display *d;
Window w;
XEvent e;
char *msg = "Hello, World!";
int s;
/* open connection with the server */
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Cannot open display\n");
exit(1);
}
s = DefaultScreen(d);
/* create window */
w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 200, 200, 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);
XDrawString(d, w, DefaultGC(d, s), 50, 50, msg, strlen(msg));
}
/* exit on key press */
if (e.type == KeyPress)
break;
}
/* close connection to server */
XCloseDisplay(d);
return 0;
}
gcc returned an error while trying to compile saying that X11/Xlib.h could not be found. I found similar posts with the question on other forums, but none were Ubuntu specific. It'd be great if you could either help me find an answer or link to somewhere it has previously been discussed.
Thanks
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