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square in it:/* Simple Xlib application for creating a window and drawing a box in it. gcc input.c -o output -lX11
*/
#include
#include
#include
#include int main(void){ Display *display; Window window; XEvent event; char *msg = "Hello, World!"; int s; // open connection to the server display = XOpenDisplay(NULL); if (display == NULL) { fprintf(stderr, "Cannot open display\n"); exit(1); } s = DefaultScreen(display); // create window window = XCreateSimpleWindow(display, RootWindow(display, s), 10, 10, 200, 200, 1, BlackPixel(display, s), WhitePixel(display, s)); // select kind of events we are interested in XSelectInput(display, window, ExposureMask | KeyPressMask); // map (show) the window XMapWindow(display, window); // event loop for (;;) { XNextEvent(display, &event); // draw or redraw the window if (event.type == Expose) { XFillRectangle(display, window, DefaultGC(display, s), 20, 20, 10, 10); XDrawString(display, window, DefaultGC(display, s), 50, 50, msg, strlen(msg)); } // exit on key press if (event.type == KeyPress) break; } // close connection to the server XCloseDisplay(display); return 0; }

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