node-x11/test/getprop.js

var x11 = require('../lib/x11');

var xclient = x11.createClient();
var PropertyChange = x11.eventMask.PropertyChange;

xclient.on('connect', function(display) {
    var X = this;
    var root = display.screen[0].root;
    var wid = X.AllocID();
    var white = display.screen[0].white_pixel;
    var black = display.screen[0].black_pixel;

    X.CreateWindow(wid, root, 10, 10, 400, 300, 1, 1, 0, { backgroundPixel: white, eventMask: PropertyChange });
    X.MapWindow(wid);

    // mode: 0 replace, 1 prepend, 2 append
    // mode, wid, name, type, format, data
    X.ChangeProperty(0, wid, xclient.atoms.WM_NAME, xclient.atoms.STRING, 8, 'Hello, NodeJS');
    setInterval(function() {
           X.ChangeProperty(0, wid, xclient.atoms.WM_NAME, xclient.atoms.STRING, 8, 'Hello, NodeJS ' + new Date());
    }, 1000);

    xclient.on('event', function(ev) {
        X.GetProperty(0, wid, xclient.atoms.WM_NAME, xclient.atoms.STRING, 0, 10000000, function(prop) {
            if (prop.type == xclient.atoms.STRING)
               prop.data = prop.data.toString();
            console.log(prop.data);
        }); 
    });
});