426 CHAPTER 10 WebSocket communications
■■Author: your name
■■License: BSD- Open the package.json file and add a dependency on the express and formidable
packages as shown in the following modified package.json file.
{
"name": "chat_service",
"version": "0.0.0",
"description": "A simple chat service",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": "",
"author": "Glenn Johnson",
"license": "BSD",
“private”: true,
“dependencies”: {
“express”: “3.0.x”,
“socket.io”: “0.9.x”
}
} - Install the dependent packages by typing the following command.
npm install - Open Visual Studio Express 2012 for Web. Click File and choose Open Web Site; select
the chat_service folder. - In the chat_service website folder, create an app.js file and add a reference to the
express, http, and socket.io packages. Call the listen method as follows.
var express = require('express')
, app = express()
, http = require('http')
, server = http.createServer(app)
, io = require('socket.io').listen(server);
In this code, you are using the http object to create a server based on the express
object. After that, you are using the socket.io object to call the listen method and pass-
ing the server object to indicate the server that will be listening.- In the Solution Explorer window, right-click the chat_service node, click Add, and
choose New Folder. Name the folder public. - In the app.js file, add a statement to map static requests to the /public folder as
follows.
app.use(express.static(__dirname + '/public'));