[Cocos2d-x]在Cocos2d-x 3.x版本中如何通过WebSocket连接服务器

首先新建一个空的文件夹，通过npm安装nodejs-websocket：

npm install nodejs-websocket

新建app.js文件：

var ws = require("nodejs-websocket");
ws.createServer(function(conn){
    conn.on("text",function (str) {
        console.log("get the message: "+str);
        conn.sendText("the server got the message");
    })
    conn.on("close",function (code,reason) {
        console.log("connection closed");
    });
    conn.on("error",68)">"an error !");
    });
}).listen(8001);

通过node app.js启动，这样服务器就搭建好了。

Cocos2d-x

• 首先在头文件中include头文件：

#include "network/WebSocket.h"

• 实现WebSocket的委托：

class HelloWorld : public cocos2d::Layer,public cocos2d::network::WebSocket::Delegate

• 四个委托中定义的函数接口以及一个用来连接的socketClient对象：

// for virtual function in websocket delegate
virtual void onOpen(cocos2d::network::WebSocket* ws);
virtual void onMessage(cocos2d::network::WebSocket* ws,const cocos2d::network::WebSocket::Data& data);
virtual void onClose(cocos2d::network::WebSocket* ws);
virtual void onError(cocos2d::network::WebSocket* ws,const cocos2d::network::WebSocket::ErrorCode& error);

// the websocket io client
cocos2d::network::WebSocket* _wsiClient;

• 初始化client：

_wsiClient = new cocos2d::network::WebSocket();
_wsiClient->init(*this,"ws://localhost:8001");

• 在cpp文件中实现这些函数：

// 开始socket连接
void HelloWorld::onOpen(cocos2d::network::WebSocket* ws)
{
    CCLOG("OnOpen");
}

// 接收到了消息
void HelloWorld::onMessage(cocos2d::network::WebSocket* ws,const cocos2d::network::WebSocket::Data& data)
{
        std::string textStr = data.bytes;
        textStr.c_str();
        CCLOG(textStr.c_str());
}

// 连接关闭
void HelloWorld::onClose(cocos2d::network::WebSocket* ws)
{
    if (ws == _wsiClient)
    {
        _wsiClient = NULL;
    }
    CC_SAFE_DELETE(ws);
    CCLOG("onClose");
}

// 遇到错误
void HelloWorld::onError(cocos2d::network::WebSocket* ws,const cocos2d::network::WebSocket::ErrorCode& error)
{
    if (ws == _wsiClient)
    {
        char buf[100] = {0};
        sprintf(buf,68)">"an error was fired,code: %d",error);
    }
    CCLOG("Error was fired,error code: %d",error);
}

还有一个使用SocketIO的方案，尚未尝试，明天测试一下：

// Require HTTP module (to start server) and Socket.IO
var http = require('http'),io = require('socket.io');

// Start the server at port 8080
var server = http.createServer(function(req,res){ 

    // Send HTML headers and message
    res.writeHead(200,{ 'Content-Type': 'text/html' }); 
    res.end('<h1>Hello Socket Lover!</h1>');
});
server.listen(8080);

// Create a Socket.IO instance,passing it our server
var socket = io.listen(server);

// Add a connect listener
socket.on('connection',function(client){ 

    // Create periodical which ends a message to the client every 5 seconds
    var interval = setInterval(function() {
        client.send('This is a message from the server! ' + new Date().getTime());
    },5000);

    // Success! Now listen to messages to be received
    client.on('message',function(event){ 
        console.log('Received message from client!',event);
    });
    client.on('disconnect',function(){
        clearInterval(interval);
        console.log('Server has disconnected');
    });

});

（编辑：李大同）

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