modernc.org/xcb@v1.0.15/examples/helloworld/helloworld.c (about)

     1  // +build ignore
     2  
     3  // src: https://www.x.org/releases/current/doc/libxcb/tutorial/index.html#helloworld
     4  
     5  #include <unistd.h>      /* pause() */
     6  
     7  #include <xcb/xcb.h>
     8  
     9  int
    10  main ()
    11  {
    12    xcb_connection_t *c;
    13    xcb_screen_t     *screen;
    14    xcb_window_t      win;
    15  
    16    /* Open the connection to the X server */
    17    c = xcb_connect (NULL, NULL);
    18  
    19    /* Get the first screen */
    20    screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
    21  
    22    /* Ask for our window's Id */
    23    win = xcb_generate_id(c);
    24  
    25    /* Create the window */
    26    xcb_create_window (c,                             /* Connection          */
    27                       XCB_COPY_FROM_PARENT,          /* depth (same as root)*/
    28                       win,                           /* window Id           */
    29                       screen->root,                  /* parent window       */
    30                       0, 0,                          /* x, y                */
    31                       150, 150,                      /* width, height       */
    32                       10,                            /* border_width        */
    33                       XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class               */
    34                       screen->root_visual,           /* visual              */
    35                       0, NULL);                      /* masks, not used yet */
    36  
    37    /* Map the window on the screen */
    38    xcb_map_window (c, win);
    39  
    40    /* Make sure commands are sent before we pause, so window is shown */
    41    xcb_flush (c);
    42  
    43    pause ();    /* hold client until Ctrl-C */
    44  
    45    return 0;
    46  }