c++中使用LibCurl解析http请求数据

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libcurl.lib（或libcurl.so，unix下面尽量实时编译，并且要注意系统版本（32 or 64））是跨平台解析http请求数据的动态库，使用起来非常方便。

以在Windows下使用为例。

在使用前，要将libcurl库相关的头文件添加至附加包含目录。

引用相关库：

#pragma comment(lib,"ws2_32.lib") #pragma comment(lib,"winmm.lib") #pragma comment(lib,"wldap32.lib") #pragma comment(lib,"libcurl.lib")

在预处理器定义中添加：BUILDING_LIBCURL;HTTP_ONLY

下面就是直接使用libcurl.lib的示例了。

HttpHelper.h

#ifndef HTTPHELPER#define HTTPHELPER#include "curl.h"#include "easy.h"#include "curlbuild.h"#include "curlrules.h"using namespace std;#include <vector>//http数据类class TileInfo{public:TileInfo(){data=NULL;}~TileInfo(){if (data){delete[] data;data=NULL;}}char* data;long dataSize;};//http服务类class HttpHelper{public:static HttpHelper* GetInstance();private:HttpHelper(void);~HttpHelper(void); //释放单例模式class CGarbo{public:~CGarbo(){if (HttpHelper::m_pInstance){//释放资源curl_global_cleanup();delete HttpHelper::m_pInstance;HttpHelper::m_pInstance=NULL;}}};public://通过http地址获取返回的数据bool GetDataByURL(const char* URL,char*& data,int& dataSize);private:bool curlInitTile(CURL *&curl,const char* url,vector<TileInfo*>& vecTileData);bool getTileDataByCurl(const char* URL,vector<TileInfo*>& vecTileData);private:static HttpHelper* m_pInstance;static std::_Mutex m_muTex;   //线程锁static CGarbo m_cGarBo;};#endif

HttpHelper.cpp

#include "HttpHelper.h"HttpHelper* HttpHelper::m_pInstance=NULL;HttpHelper::CGarbo HttpHelper::m_cGarBo;std::_Mutex HttpHelper::m_muTex;HttpHelper::HttpHelper(void){}HttpHelper::~HttpHelper(void){}//线程安全的单例模式HttpHelper* HttpHelper::GetInstance(){if (m_pInstance==NULL){m_muTex._Lock();if (m_pInstance==NULL){m_pInstance=new HttpHelper;//初始化curlcurl_global_init(CURL_GLOBAL_ALL);}m_muTex._Unlock();}return m_pInstance;}bool HttpHelper::GetDataByURL(const char* URL,char*& data,int& dataSize){vector<TileInfo*> vecData;bool bSuccess=getTileDataByCurl(URL,vecData);if (bSuccess){//获取数据大小vector<TileInfo*>::iterator pIter = vecData.begin();for (;pIter!=vecData.end();pIter++){dataSize+=((*pIter)->dataSize);}//数据合并pIter = vecData.begin();data = new char[dataSize];long nBegin=0;for (;pIter!=vecData.end();pIter++){memcpy(data+nBegin,(*pIter)->data,(*pIter)->dataSize);nBegin+=((*pIter)->dataSize);}}//释放内存if (vecData.size()>0){vector<TileInfo*>::iterator pIter = vecData.begin();for (;pIter!=vecData.end();pIter++){delete *pIter;(*pIter)=NULL;}vector<TileInfo*>().swap(vecData);}}//数据回调函数long writerTile(void* data,int size,int nmemb,vector<TileInfo*>& vecData){long sizes=size*nmemb;TileInfo* tf=new TileInfo;tf->data=new char[sizes+1];memcpy(tf->data,(char*)data,sizes);tf->data[sizes]=0;tf->dataSize=sizes;vecData.push_back(tf);return sizes;}//curl句柄初始化bool HttpHelper::curlInitTile(CURL *&curl,const char* url,vector<TileInfo*>& vecData){CURLcode code;char* error=NULL;curl=curl_easy_init();if (curl==NULL){return false;}code=curl_easy_setopt(curl,CURLOPT_ERRORBUFFER,error);if (code!=CURLE_OK){return false;}    curl_easy_setopt(curl,CURLOPT_VERBOSE,1L);code=curl_easy_setopt(curl,CURLOPT_URL,url);if (code!=CURLE_OK){return false;}code=curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,writerTile);if (code!=CURLE_OK){return false;}code=curl_easy_setopt(curl,CURLOPT_WRITEDATA,&vecData);if (code!=CURLE_OK){return false;}return true;}//发送http请求获取数据bool HttpHelper::getTileDataByCurl(const char* URL,vector<TileInfo*>& vecTileData){//定义一个easy handle句柄CURL* curl=NULL;CURLcode code;//初始化if (!curlInitTile(curl,URL,vecTileData)){curl_easy_cleanup(curl);return false;}//执行数据请求code = curl_easy_perform(curl);if (code!=CURLE_OK){curl_easy_cleanup(curl);return false;}//获取数据long retCode=0;code=curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE,&retCode);if (code==CURLE_OK && retCode==200){double length=0;code=curl_easy_getinfo(curl,CURLINFO_CONTENT_LENGTH_DOWNLOAD,&length);}else{curl_easy_cleanup(curl);return false;}curl_easy_cleanup(curl);return true;}

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