程式語言 - X Window (X11) - C/C++ - Hello, world!

參考資訊：
https://github.com/QMonkey/Xlib-demo
https://people.scs.carleton.ca/~claurend/Courses/COMP2401/Notes/COMP2401_Ch8_Graphics.pdf

main.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <X11/Xlib.h>
 
int main(int argc, char *argv[])
{
    Window win = 0;
    Display *display = NULL;
 
    display = XOpenDisplay(NULL);
    win = XCreateSimpleWindow(
        display,
        RootWindow(display, 0),
        0,
        0,
        320,
        240,
        0,
        0,
        0xffffff);
 
    XStoreName(display, win, "Hello, world!");
    XMapWindow(display, win);
    XFlush(display);
    usleep(3000000);
 
    XUnmapWindow(display, win);
    XDestroyWindow(display, win);
    XCloseDisplay(display);
 
    return 0;
}

編譯、測試

$ gcc main.c -o main -lX11
$ ./main