[Cocos2d-x]在Cocos2d-x 3.x版本中如何通过WebSocket连接服务器进行数据传输

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WebSocket

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", function (code, reason) {        console.log("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 delegatevirtual 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 clientcocos2d::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, "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.IOvar http = require('http'), io = require('socket.io');// Start the server at port 8080var 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 servervar socket = io.listen(server);// Add a connect listenersocket.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');    });});

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