使用CCHttpClient进行cocos2d-x网络编程

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From: http://blog.csdn.net/fansongy/article/details/9207595

在我使用的cocos2d-x版本（2.1.2）中，已经将curl融进cocos2d-x框架中。下面动手写个简单的网络程序。

首先创建一个cocos2d-x项目。

然后我创建了一个网络连接的类，名叫HttpNetConn。其继承自CCObject，管理网络连接的相应功能。

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/*
* 网络连接模块
* NetConnect.h
*
* Created by fansy [2013-6-30]
*/
#ifndef _NET_CONNECTION_H_
#define _NET_CONNECTION_H_
#include <cocos2d.h>
USING_NS_CC;
class NetConnect: public CCObject
{
public:
CREATE_FUNC(NetConnect);
virtual bool init();
void getData();
void httpReqFinished(CCNode* node,CCObject* obj);
};
#endif

其中，getData()是向服务器发请求，httpReqFinished是服务器响应的应答。

好，接下来，动手实现。

首先，CCHttpClient在extition中，如果你的包含目录和我一样，没有这个，就要在项目属性->c/c++->附加包含目录中添加：$(SolutionDir)\extensions 此项（具体位置可能和我的有些不一样）。并在其NetConnection.cpp的头文件处加上：

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#include "cocos-ext.h"
#include "../extensions/network/HttpClient.h"
#include "../extensions/network/HttpRequest.h"
USING_NS_CC_EXT;

接下来，写getData函数：

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void NetConnect::getData()
{
CCHttpClient* httpClient = CCHttpClient::getInstance();
CCHttpRequest* httpReq =new CCHttpRequest();
httpReq->setRequestType(CCHttpRequest::kHttpGet);
httpReq->setUrl("http://www.baidu.com");
httpReq->setResponseCallback(this,callfuncND_selector(NetConnect::httpReqFinished));
httpReq->setTag("FirstNet");
httpClient->setTimeoutForConnect(30);
httpClient->send(httpReq);
httpReq->release();
}

觉得逻辑很清晰，就不细解释了。然后是回调函数：

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void NetConnect::httpReqFinished( CCNode* node,CCObject* obj )
{
CCHttpResponse* response = (CCHttpResponse*)obj;
if (!response->isSucceed())
{
CCLog("Receive Error! %s\n",response->getErrorBuffer());
return ;
}
const char* tag = response->getHttpRequest()->getTag();
if ( 0 == strcmp("FirstNet",tag))
{
std::vector<char> *data = response->getResponseData();
int data_length = data->size();
std::string res;
for (int i = 0;i<data_length;++i)
{
res+=(*data)[i];
}
res+='\0';
CCLog("%s",res.c_str());
}
}

ok，F7编译。发现缺少库：

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1> NetConnect.cpp
1>NetConnect.obj : error LNK2019: 无法解析的外部符号 "public: static class cocos2d::extension::CCHttpClient * __cdecl cocos2d::extension::CCHttpClient::getInstance(void)" (?getInstance@CCHttpClient@extension@cocos2d@@SAPAV123@XZ)，该符号在函数 "public: void __thiscall NetConnect::getData(void)" (?getData@NetConnect@@QAEXXZ) 中被引用
1>NetConnect.obj : error LNK2019: 无法解析的外部符号 "public: void __thiscall cocos2d::extension::CCHttpClient::send(class cocos2d::extension::CCHttpRequest *)" (?send@CCHttpClient@extension@cocos2d@@QAEXPAVCCHttpRequest@23@@Z)，该符号在函数 "public: void __thiscall NetConnect::getData(void)" (?getData@NetConnect@@QAEXXZ) 中被引用
1>D:\Code\UseLess\HelloCSDN\Debug.win32\HelloCSDN.win32.exe : fatal error LNK1120: 2 个无法解析的外部命令

缺少libExtensions.lib库，加上。在项目属性->链接器->附加依赖项中添加：libExtensions.lib。再编译。

额...似乎还缺：

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1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_create，该符号在函数 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" (?lazyInitThreadSemphore@CCHttpClient@extension@cocos2d@@AAE_NXZ) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_detach，该符号在函数 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" (?lazyInitThreadSemphore@CCHttpClient@extension@cocos2d@@AAE_NXZ) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_exit，该符号在函数 "void * __cdecl cocos2d::extension::networkThread(void *)" (?networkThread@extension@cocos2d@@YAPAXPAX@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_mutex_init，该符号在函数 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" (?lazyInitThreadSemphore@CCHttpClient@extension@cocos2d@@AAE_NXZ) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_mutex_destroy，该符号在函数 "void * __cdecl cocos2d::extension::networkThread(void *)" (?networkThread@extension@cocos2d@@YAPAXPAX@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_mutex_lock，该符号在函数 "private: void __thiscall cocos2d::extension::CCHttpClient::dispatchResponseCallbacks(float)" (?dispatchResponseCallbacks@CCHttpClient@extension@cocos2d@@AAEXM@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__pthread_mutex_unlock，该符号在函数 "private: void __thiscall cocos2d::extension::CCHttpClient::dispatchResponseCallbacks(float)" (?dispatchResponseCallbacks@CCHttpClient@extension@cocos2d@@AAEXM@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__sem_init，该符号在函数 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" (?lazyInitThreadSemphore@CCHttpClient@extension@cocos2d@@AAE_NXZ) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__sem_destroy，该符号在函数 "void * __cdecl cocos2d::extension::networkThread(void *)" (?networkThread@extension@cocos2d@@YAPAXPAX@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__sem_wait，该符号在函数 "void * __cdecl cocos2d::extension::networkThread(void *)" (?networkThread@extension@cocos2d@@YAPAXPAX@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__sem_post，该符号在函数 "private: virtual __thiscall cocos2d::extension::CCHttpClient::~CCHttpClient(void)" (??1CCHttpClient@extension@cocos2d@@EAE@XZ) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_slist_append，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_slist_free_all，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_easy_init，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_easy_setopt，该符号在函数 "bool __cdecl cocos2d::extension::configureCURL(void *)" (?configureCURL@extension@cocos2d@@YA_NPAX@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_easy_perform，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_easy_cleanup，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用
1>libExtensions.lib(HttpClient.obj) : error LNK2019: 无法解析的外部符号 __imp__curl_easy_getinfo，该符号在函数 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" (?processGetTask@extension@cocos2d@@YAHPAVCCHttpRequest@12@P6AIPAXII1@Z1PAH@Z) 中被引用

再按之前的方法加入：libcurl_imp.lib、pthreadVCE2.lib 这两个库。再编译，走你。

终于行了。

接下来把它加到程序中。先在HelloWorldScene中加入NetConnect.h头文件。我更改了右下角的那个CCMenuItem的响应。

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void HelloWorld::menuCloseCallback(CCObject* pSender)
{
// "close" menu item clicked
//CCDirector::sharedDirector()->end();
NetConnect* nc = NetConnect::create();
nc->getData();
}

运行程序，点击右下角的按钮。看输出日志。打出了我们想要的东西。

=========================================================================

以下内容为本人在win7 64位 + vs2012 + cocos2d-x-3.2下的实践版本

先声明下：这个项目需要用到libNetwork.lib库，但是这个文件默认不存在，但是有相应的库项目，添加进来即可(路径：cocos2d\cocos\network\proj.win32\libNetwork.vcxproj)，如图：

NetConnect.h

#ifndef __NET_CONNECT_H__#define __NET_CONNECT_H__#pragma once#include <cocos2d.h>USING_NS_CC;class NetConnect : public CCObject{public:CREATE_FUNC(NetConnect);  virtual bool init();void getData();void httpReqFinished(CCNode* node, void* obj);};#endif

NetConnect.cpp

#include <cocos/network/HttpClient.h>#include <cocos/network/HttpRequest.h>#include "NetConnect.h"using namespace network;void writeFile(const char* fname, const std::string &str){FILE *fp = fopen(fname, "wb");if(fp){fwrite(str.c_str(), str.size(), 1, fp);fclose(fp);CCLog("write file successful");}elseCCLog("can not open file for write");}bool NetConnect::init(){return true;}void NetConnect::getData(){HttpClient* httpClient = HttpClient::getInstance();HttpRequest* httpReq = new HttpRequest();httpReq->setRequestType(HttpRequest::Type::GET);httpReq->setUrl("http://www.baidu.com");httpReq->setResponseCallback(this, callfuncND_selector(NetConnect::httpReqFinished));httpReq->setTag("FirstNet");httpClient->setTimeoutForConnect(30);httpClient->send(httpReq);httpReq->release();}void NetConnect::httpReqFinished( CCNode* node, void* obj ){HttpResponse* response = (HttpResponse*)obj;if (!response->isSucceed()){CCLog("Receive Error! %s\n", response->getErrorBuffer());return ;}const char* tag = response->getHttpRequest()->getTag();if ( 0 == strcmp("FirstNet", tag)){std::vector<char> *data = response->getResponseData();int data_length = data->size();std::string res;for (int i = 0; i < data_length; ++i){res += (*data)[i];}res += '\0';CCLog("%s", res.c_str());writeFile("baidu.html", res);}}

同时修改HelloWorld::init()，使其调用我们建立的这个NetConnect类：

bool HelloWorld::init(){    //////////////////////////////    // 1. super init first    if ( !Layer::init() )    {        return false;    }        Size visibleSize = Director::getInstance()->getVisibleSize();    Vec2 origin = Director::getInstance()->getVisibleOrigin();    /////////////////////////////    // 2. add a menu item with "X" image, which is clicked to quit the program    //    you may modify it.    // add a "close" icon to exit the progress. it's an autorelease object    auto closeItem = MenuItemImage::create(                                           "CloseNormal.png",                                           "CloseSelected.png",                                           CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));    closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,                                origin.y + closeItem->getContentSize().height/2));    // create menu, it's an autorelease object    auto menu = Menu::create(closeItem, NULL);    menu->setPosition(Vec2::ZERO);    this->addChild(menu, 1);    /////////////////////////////    // 3. add your codes below...    // add a label shows "Hello World"    // create and initialize a label        auto label = LabelTTF::create("Hi, JoeBlack", "Arial", 44);        // position the label on the center of the screen    label->setPosition(Vec2(origin.x + visibleSize.width/2,                            origin.y + visibleSize.height - label->getContentSize().height));    // add the label as a child to this layer    this->addChild(label, 1);    // add "HelloWorld" splash screen"    auto sprite = Sprite::create("HelloWorld.png");    // position the sprite on the center of the screen    sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));    // add the sprite as a child to this layer    this->addChild(sprite, 0);    NetConnect *netConn = NetConnect::create();netConn->getData();    return true;}

项目库的依赖关系如下图：

解决方案配置，可加快编译速度，参考：http://blog.csdn.net/peoplezhou/article/details/39957265

项目的头文件include路径添加"..\cocos2d"，因为编译时的当前目录为解决方案(即*.sln)所在路径

再手工添加一个依赖库文件：libcurl_imp.lib，如图：

编译运行(F5或Ctrl+F5)后，将会在"Resources"下生成一个baidu.html文件(同时也说明程序运行时当前路径是Resources)，双击该文件即可看到相应网页，也可通过编辑器查看其文本。

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