首先建立一個cocos2d-x專案。

    然後我建立了一個網路連線的類，名叫HttpNetConn。其繼承自CCObject，管理網路連線的相應功能。

1. /* 
2.  * 網路連線模組 
3.  * NetConnect.h 
4.  *  
5.  * Created by fansy [2013-6-30] 
6.  */
7. #ifndef _NET_CONNECTION_H_
8. #define _NET_CONNECTION_H_
9. #include <cocos2d.h>
10. USING_NS_CC;  
11. class NetConnect: public CCObject  
12. {  
13. public:  
14.     CREATE_FUNC(NetConnect);  
15.     virtualbool init();  
16.     void getData();  
17.     void httpReqFinished(CCNode* node,CCObject* obj);  
18. };  
19. #endif

    其中，getData()是向伺服器發請求，httpReqFinished是伺服器響應的應答。

    好，接下來，動手實現。

    首先，CCHttpClient在extition中，如果你的包含目錄和我一樣，沒有這個，就要在專案屬性->c/c++->附加包含目錄中新增：$(SolutionDir)\extensions 此項（具體位置可能和我的有些不一樣）。並在其NetConnection.cpp的標頭檔案處加上：

1. #include "cocos-ext.h"
2. #include "../extensions/network/HttpClient.h"
3. #include "../extensions/network/HttpRequest.h"
4. USING_NS_CC_EXT;  

1. void NetConnect::getData()  
2. {  
3.     CCHttpClient* httpClient = CCHttpClient::getInstance();  
4.     CCHttpRequest* httpReq =new CCHttpRequest();  
5.     httpReq->setRequestType(CCHttpRequest::kHttpGet);  
6.     httpReq->setUrl("http://www.baidu.com");  
7.     httpReq->setResponseCallback(this,callfuncND_selector(NetConnect::httpReqFinished));  
8.     httpReq->setTag("FirstNet");  
9.     httpClient->setTimeoutForConnect(30);  
10.     httpClient->send(httpReq);  
11.     httpReq->release();  
12. }  

1. void NetConnect::httpReqFinished( CCNode* node,CCObject* obj )  
2. {  
3.     CCHttpResponse* response = (CCHttpResponse*)obj;  
4.     if (!response->isSucceed())  
5.     {  
6.         CCLog("Receive Error! %s\n",response->getErrorBuffer());  
7.         return ;   
8.     }  
9.     constchar* tag = response->getHttpRequest()->getTag();  
10.     if ( 0 == strcmp("FirstNet",tag))  
11.     {  
12.         std::vector<char> *data = response->getResponseData();  
13.         int data_length =  data->size();  
14.         std::string res;  
15.         for (int i = 0;i<data_length;++i)  
16.         {  
17.             res+=(*data)[i];  
18.         }  
19.         res+='\0';  
20.         CCLog("%s",res.c_str());  
21.     }  
22. }  

1. 1>  NetConnect.cpp  
2. 1>NetConnect.obj : error LNK2019: 無法解析的外部符號 "public: static class cocos2d::extension::CCHttpClient * __cdecl cocos2d::extension::CCHttpClient::getInstance(void)" ([email protected]@[email protected]@@[email protected])，該符號在函式 "public: void __thiscall NetConnect::getData(void)" ([email protected]@@QAEXXZ) 中被引用  
3. 1>NetConnect.obj : error LNK2019: 無法解析的外部符號 "public: void __thiscall cocos2d::extension::CCHttpClient::send(class cocos2d::extension::CCHttpRequest *)" ([email protected]@[email protected]@@[email protected]@@Z)，該符號在函式 "public: void __thiscall NetConnect::getData(void)" ([email protected]@@QAEXXZ) 中被引用  
4. 1>D:\Code\UseLess\HelloCSDN\Debug.win32\HelloCSDN.win32.exe : fatal error LNK1120: 2 個無法解析的外部命令  

    額...似乎還缺：

1. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_create，該符號在函式 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" ([email protected]@[email protected]@@AAE_NXZ) 中被引用  
2. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_detach，該符號在函式 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" ([email protected]@[email protected]@@AAE_NXZ) 中被引用  
3. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_exit，該符號在函式 "void * __cdecl cocos2d::extension::networkThread(void *)" ([email protected]@[email protected]@[email protected]) 中被引用  
4. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_mutex_init，該符號在函式 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" ([email protected]@[email protected]@@AAE_NXZ) 中被引用  
5. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_mutex_destroy，該符號在函式 "void * __cdecl cocos2d::extension::networkThread(void *)" ([email protected]@[email protected]@[email protected]) 中被引用  
6. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_mutex_lock，該符號在函式 "private: void __thiscall cocos2d::extension::CCHttpClient::dispatchResponseCallbacks(float)" ([email protected]@[email protected]@@[email protected]) 中被引用  
7. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__pthread_mutex_unlock，該符號在函式 "private: void __thiscall cocos2d::extension::CCHttpClient::dispatchResponseCallbacks(float)" ([email protected]@[email protected]@@[email protected]) 中被引用  
8. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__sem_init，該符號在函式 "private: bool __thiscall cocos2d::extension::CCHttpClient::lazyInitThreadSemphore(void)" ([email protected]@[email protected]@@AAE_NXZ) 中被引用  
9. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__sem_destroy，該符號在函式 "void * __cdecl cocos2d::extension::networkThread(void *)" ([email protected]@[email protected]@[email protected]) 中被引用  
10. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__sem_wait，該符號在函式 "void * __cdecl cocos2d::extension::networkThread(void *)" ([email protected]@[email protected]@[email protected]) 中被引用  
11. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__sem_post，該符號在函式 "private: virtual __thiscall cocos2d::extension::CCHttpClient::~CCHttpClient(void)" ([email protected]@[email protected]@[email protected]) 中被引用  
12. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_slist_append，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  
13. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_slist_free_all，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  
14. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_easy_init，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  
15. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_easy_setopt，該符號在函式 "bool __cdecl cocos2d::extension::configureCURL(void *)" ([email protected]@[email protected]@[email protected]) 中被引用  
16. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_easy_perform，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  
17. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_easy_cleanup，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  
18. 1>libExtensions.lib(HttpClient.obj) : error LNK2019: 無法解析的外部符號 __imp__curl_easy_getinfo，該符號在函式 "int __cdecl cocos2d::extension::processGetTask(class cocos2d::extension::CCHttpRequest *,unsigned int (__cdecl*)(void *,unsigned int,unsigned int,void *),void *,int *)" ([email protected]@[email protected]@[email protected]@[email protected]@Z) 中被引用  

    終於行了。

    接下來把它加到程式中。先在HelloWorldScene中加入NetConnect.h標頭檔案。我更改了右下角的那個CCMenuItem的響應。

1. void HelloWorld::menuCloseCallback(CCObject* pSender)  
2. {  
3.     // "close" menu item clicked
4.     //CCDirector::sharedDirector()->end();
5.     NetConnect* nc = NetConnect::create();  
6.     nc->getData();  
7. }  

    執行程式，點選右下角的按鈕。看輸出日誌。打出了我們想要的東西。

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

以下內容為本人在win7 64位 + vs2012 + cocos2d-x-3.2下的實踐版本

先宣告下：這個專案需要用到libNetwork.lib庫，但是這個檔案預設不存在，但是有相應的庫專案，新增進來即可(路徑：cocos2d\cocos\network\proj.win32\libNetwork.vcxproj)，如圖：

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

#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");
	}
	else
		CCLog("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);
	}
}

同時修改HelloWorld::init()，使其呼叫我們建立的這個NetConnect類：

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;
}

專案庫的依賴關係如下圖：

專案的標頭檔案include路徑新增"..\cocos2d"，因為編譯時的當前目錄為解決方案(即*.sln)所在路徑

再手工新增一個依賴庫檔案：libcurl_imp.lib，如圖：

編譯執行(F5或Ctrl+F5)後，將會在"Resources"下生成一個baidu.html檔案(同時也說明程式執行時當前路徑是Resources)，雙擊該檔案即可看到相應網頁，也可通過編輯器檢視其文字。