4-连接服务器

来源：互联网发布：2016淘宝热卖排行榜编辑：程序博客网时间：2024/09/21 09:24

上篇使用python + tornado搭建了一个最简单的服务，现在我们在客户端连接下我们的服务器，实现client和server的通信。

一，环境

OS X 10.8.5 、XCode 5.1.1、cocos2dx 2.1rc0-x-2.1.4

二，cocos2dx的http请求

cocos2dx为我们提供了CCHttpRequest、CCHttpClient（单例）两个类来发起http请求，使用方法如下：

       CCHttpRequest *pRequest = new CCHttpRequest();       pRequest->setUrl("http://127.0.0.1");       pRequest->setRequestType(CCHttpRequest::kHttpGet);       pRequest->setResponseCallback(this, callfuncND_selector(HttpSender::HttpCallBack)); //设置回调       CCHttpClient *pHttpClient = CCHttpClient::getInstance();       pHttpClient->send(pRequest);

这样发起一次连接还马马虎虎能够接受，但是一个应用程序会有很多不同的请求，如果每个请求都按照上述方法进行，将会很繁琐，

代码将会很难维护。有必要对http请求进行再一次的封装。

三，对http请求进行封装

需求：简化发起http请求的代码量，使代码易维护；

设计：一个类（HttpSender）负责发起http请求、接收回调消息，将得到的消息传递给使用者（HttpCallbackTarget）；

类图如下：

四，类HttpCallbackTarget的实现如下

///  CallbackTarget.h//  MyClient_CPP////  Created by Woodlouse on 14-9-3.////#ifndef __MyClient_CPP__HttpCallbackTarget__#define __MyClient_CPP__HttpCallbackTarget__//#include "CCObject.h"#include "cocos2d.h"namespace MyClient_CPP {    class HttpCallbackTarget {                public:            //NVI        void Callback(cocos2d::CCNode *pSrc, void *pData){                GetData(pSrc, pData);            }                protected:            HttpCallbackTarget(){};            virtual ~HttpCallbackTarget(){};                    virtual void GetData(cocos2d::CCNode *pSrc, void *pData) = 0;    };}#endif /* defined(__MyClient_CPP__CallbackTarget__) */

五，HttpSender类的实现如下

////  HttpSender.h//  MyClient_CPP////  Created on 14-9-3.////  Functon : 发送http请求//  Author : Woodlouse#ifndef __MyClient_CPP__HttpSender__#define __MyClient_CPP__HttpSender__#include "HttpRequest.h"using namespace cocos2d;using namespace cocos2d::extension;namespace MyClient_CPP{    class HttpCallbackTarget;    class HttpSender;        class HttpSender : public CCObject{            public:        HttpSender(HttpCallbackTarget *pAgent);                ~HttpSender(){            CC_SAFE_RELEASE(m_pRequest);        }            public:        //初始化信息        void initRequest(const char *pUrl, CCHttpRequest::HttpRequestType type);        void initRequest(const char *pUrl, CCHttpRequest::HttpRequestType type, const char *pData, int len);        void send();            private:        CCHttpRequest* initRequest();        //接收http回应得回调        void HttpCallBack(CCNode *pRc, void *pData);            private:        CCHttpRequest *m_pRequest;        //代理        HttpCallbackTarget *m_pAgent;    };    }#endif /* defined(__MyClient_CPP__HttpSender__) */

.cpp如下：

////  HttpSender.cpp//  MyClient_CPP////  Created by Woodlouse on 14-9-3.////#include "HttpSender.h"#include "HttpCallbackTarget.h"#include "HttpClient.h"using namespace MyClient_CPP;HttpSender::HttpSender(HttpCallbackTarget *pAgent):m_pRequest(NULL),m_pAgent(NULL){    if(!pAgent) {        CCAssert(false, "Got an bad Agent");        return;    }        m_pAgent = pAgent;}CCHttpRequest* HttpSender::initRequest(){    if (m_pRequest) {        return m_pRequest;    }    m_pRequest = new CCHttpRequest();    if (!m_pRequest) {        return NULL;    }        //设置回调    m_pRequest->setResponseCallback(this, callfuncND_selector(HttpSender::HttpCallBack));    return m_pRequest;}void HttpSender::initRequest(const char *pUrl, CCHttpRequest::HttpRequestType type){    if (!pUrl) {        CCAssert(false, "Got an bad url !!");        return;    }        if (!initRequest()) {        //初始化失败        CCLOG("Init HttpSender Error!!");        return;    }    m_pRequest->setUrl(pUrl);    m_pRequest->setRequestType(type);}void HttpSender::initRequest(const char *pUrl, CCHttpRequest::HttpRequestType type, const char *pData, int len){    if (!pData || len<=0) {        CCAssert(false, "Got an bad data");        return;    }    this->initRequest(pUrl, type);    m_pRequest->setRequestData(pData, len);}void HttpSender::HttpCallBack(CCNode *pRc, void *pData){    if (!m_pAgent) {        return;    }    m_pAgent->Callback(pRc, pData);}void HttpSender::send(){    CCHttpClient *pHttpClient = CCHttpClient::getInstance();    pHttpClient->send(m_pRequest);}

六，修改HelloWorldScene.h

对类ClassWorld添加继承类HttpCallbackTarget :

class HelloWorld : public cocos2d::CCLayer, public HttpCallbackTarget

添加函数定义：

void GetData(CCNode *pNode, void *pData);

void SendRequest(CCObject*, CCControlEvent);

添加成员变量：

HttpSender *m_pHttpSender;

七，在HelloWorldScene.cpp中添加测试代码

在init()函数中添加一个测试按钮“Send Requrest”:

CCControlButton* pButton = CCControlButton::create("Send request", "Thonburi", 34);this->addChild(pButton, 1);pButton->setPosition(ccp(size.width/2, 35));pButton->addTargetWithActionForControlEvents(this, cccontrol_selector(HelloWorld::SendRequest), CCControlEventTouchDown);

实现发送函数：

void HelloWorld::SendRequest(CCObject* prc, CCControlEvent evt){    if (!m_pHttpSender) {        m_pHttpSender = new HttpSender(this);    }    m_pHttpSender->initRequest("http://127.0.0.1:8888", CCHttpRequest::kHttpGet);//连接我们自己的服务器    m_pHttpSender->send();        CCLOG("Send request !!!");}

实现收到数据的回调函数：

void HelloWorld::GetData(CCNode *pNode, void *pData){    if (!pData) {        return;    }        CCHttpResponse *pResponse = (CCHttpResponse*)pData;    if(pResponse->getResponseCode() != 200){        //错误        CCLOG("Error code is %d, and reason is %s ***", pResponse->getResponseCode(), pResponse->getErrorBuffer());        return;    }        //数据    std::vector<char>* pReceiveData = pResponse->getResponseData();    std::stringstream oss;    for (int i=0; i<pReceiveData->size(); ++i) {        oss<<(*pReceiveData)[i];    }        std::string temp = oss.str();    const char* buf = temp.c_str();    CCLOG("Receive msg is = %s *** ", buf);}

在此，我们只把我们收到的数据打印出来。

八，总结

这种对http服务进行了最简单的封装，没有设定超时的处理；每一个场景同时只能发送一个http请求。

源码:http://download.csdn.net/detail/thekingofc/7949617

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