Window creation/X11
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You are encouraged to solve this task according to the task description, using any language you may know.
Create a simple Xlib application that draws a box and "Hello World" in a window.
C
Compile with:
- gcc -L/usr/X11R6/lib -lX11 hello-x.c -o hello-x
<C>#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;
d = XOpenDisplay(NULL); if (d == NULL) { fprintf(stderr, "Cannot open display\n"); exit(1); }
s = DefaultScreen(d); w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1, BlackPixel(d, s), WhitePixel(d, s)); XSelectInput(d, w, ExposureMask | KeyPressMask); XMapWindow(d, w);
while (1) { XNextEvent(d, &e); if (e.type == Expose) { XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10); XDrawString(d, w, DefaultGC(d, s), 10, 50, msg, strlen(msg)); } if (e.type == KeyPress) break; }
XCloseDisplay(d); return 0;
} </C>
OCaml
<ocaml>#directory "+Xlib"
- load "Xlib.cma"
open Xlib
let () =
let msg = "Hello, World!" in let d = xOpenDisplay "" in let s = xDefaultScreen d in let w = xCreateSimpleWindow d (xRootWindow d s) 10 10 100 100 1 (xBlackPixel d s) (xWhitePixel d s) in xSelectInput d w [ExposureMask; KeyPressMask]; xMapWindow d w;
let e = new_xEvent() in try while true do xNextEvent d e; match xEventType e with | Expose -> xFillRectangle d w (xDefaultGC d s) 20 20 10 10; xDrawString d w (xDefaultGC d s) 10 50 msg; | KeyPress -> raise Exit | _ -> () done with Exit -> xCloseDisplay d;
- </ocaml>