C++使用libcurl做HttpClient

淩亂°似流年 2022-08-06 02:24 155阅读 0赞

当使用C++做HTTP客户端时，目前通用的做法就是使用libcurl。其官方网站的地址是http://curl.haxx.se/，该网站主要提供了Curl和libcurl。Curl是命令行工具，用于完成FTP, FTPS, HTTP, HTTPS, GOPHER, TELNET, DICT, FILE 以及 LDAP的命令的请求及接收回馈。libcurl提供给开发者，用于使用C++跨平台的开发各种网络协议的请求及响应。里面的文档非常齐全，不过都是英文的。

本文提供最简单的demo使用libcurl开发HttpClient。主要包括同步的HTTP GET、HTTP POST、HTTPS GET、HTTPS POST。

#ifndef __CurlDemo__HttpCurl__
    #define __CurlDemo__HttpCurl__
    #include "cocos2d.h"
    #include <string>
    USING_NS_CC;
    class CHttpClient
    {
    public:
        CHttpClient(void);
        ~CHttpClient(void);
        
        /**
         *@brief HTTP POST请求
         *@param strUrl 输入参数，请求Url地址，如:http://www.baidu.com
         *@param strPost 输入参数，使用如下格式:para1=val1¶2=val2
         *@param strResponse 输出参数，返回内容
         *@return 返回是否Post成功
         */
        int Post(const std::string& strUrl,const std::string& strPost,std::string& strResponse);
        
        /**
         *@brief HTTP GET请求
         *@param strUrl 输入参数，请求的Url地址，如:https://www.alipay.com
         *@param strResponse 输出参数，返回的内容
         *@return 返回是否成功
         */
        int Get(const std::string& strUrl,std::string& strResponse);
        
        /**
         *@brief HTTPS POST请求，无证书版本
         *@param strUrl 输入参数，请求的Url地址，如：https://www.alipay.com
         *@param strPost 输入参数，使用格式如下：para1=val1¶2=val2
         *@param strResponse 输出参数，返回的内容
         *@param pCaPath 输入参数，为CA证书的路径，如果输入为NULL，则不验证服务器端证书的有效性
         *@return 返回是否Posts成功
         */
        int Posts(const std::string& strUrl,const std::string& strPost,std::string& strResponse,const char* pCaPath = NULL);
        
        /**
         *@brief HTTPS GET请求，无证书版
         *@param strUrl 输入参数，请求的Url地址，如https://www.alipay.com
         *@param strResponse 输出参数，返回的内容
         *@param pCaPath 输入参数，为CA证书的路径，如果输入为NULL，则不验证服务端证书的有效性
         *@return 返回是否Gets成功
         */
        int Gets(const std::string& strUrl,std::string& strResponse,const char* pCaPath = NULL);
        
    public:
        void setDebug(bool bDebug);
    private:
        bool m_Debug;
    };
    
    #endif /* defined(__CurlDemo__HttpCurl__) */

#include "HttpCurl.h"
    #include <string>
    
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    #include "../cocos2d/external/curl/include/ios/curl/curl.h"
    #endif
    
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
    #include "../cocos2d/external/curl/include/android/curl/curl.h"
    #endif
    
    CHttpClient::CHttpClient(void)
    :m_Debug(false)
    {
    
    }
    CHttpClient::~CHttpClient(void)
    {
        
    }
    
    static int OnDebug(CURL *,curl_infotype itype,char* pData,size_t size,void *)
    {
        if(itype == CURLINFO_TEXT)
        {
            //printf("[TEXT]%s\n", pData);
        }
        else if(itype == CURLINFO_HEADER_IN)
        {
            printf("[HEADER_IN]%s\n", pData);
        }
        else if(itype == CURLINFO_HEADER_OUT)
        {
            printf("[HEADER_OUT]%s\n", pData);
        }
        else if(itype == CURLINFO_DATA_IN)
        {
            printf("[DATA_IN]%s\n", pData);
        }
        else if(itype == CURLINFO_DATA_OUT)
        {
            printf("[DATA_OUT]%s\n", pData);
        }
        return 0;
    }
    
    static size_t OnWirteData(void* buffer,size_t size,size_t nmemb,void* lpVoid)
    {
        std::string* str =dynamic_cast<std::string*>((std::string *) lpVoid);
        if(NULL == str || NULL == buffer)
        {
            return -1;
        }
        
        char* pData = (char*)buffer;
        str->append(pData,size* nmemb);
        return nmemb;
    }
    
    int CHttpClient::Post(const std::string &strUrl, const std::string &strPost, std::string &strResponse)
    {
        CURLcode res;
        CURL* curl = curl_easy_init();
        if(NULL == curl)
        {
            return CURLE_FAILED_INIT;
        }
        if(m_Debug)
        {
            curl_easy_setopt(curl, CURLOPT_VERBOSE,1);
            curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION,OnDebug);
        }
        curl_easy_setopt(curl, CURLOPT_URL,strUrl.c_str());
        curl_easy_setopt(curl, CURLOPT_POST, 1);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, strPost.c_str());
        curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWirteData);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);
        curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 20);//连接时间
        curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        return res;
    }
    
    int CHttpClient::Get(const std::string &strUrl, std::string &strResponse)
    {
        CURLcode res;
        CURL* curl = curl_easy_init();
        log("%d",NULL == curl?0:1);
        if(NULL == curl)
        {
            return CURLE_FAILED_INIT;
        }
        if(m_Debug)
        {
            curl_easy_setopt(curl, CURLOPT_VERBOSE,1);
            curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION,OnDebug);
        }
        curl_easy_setopt(curl, CURLOPT_URL,strUrl.c_str());
        curl_easy_setopt(curl, CURLOPT_READFUNCTION,NULL);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWirteData);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA,(void*)& strResponse);
        
        curl_easy_setopt(curl, CURLOPT_NOSIGNAL,1);
        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT,20);
        curl_easy_setopt(curl, CURLOPT_TIMEOUT,20);
        res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed:%s\n",curl_easy_strerror(res));
        }
        curl_easy_perform(curl);
        return res;
    }
    
    int CHttpClient::Posts(const std::string &strUrl, const std::string &strPost, std::string &strResponse,const char* pCaPath)
    {
        CURLcode res;
        CURL* curl = curl_easy_init();
        if(NULL == curl)
        {
            return CURLE_FAILED_INIT;
        }
        if(m_Debug)
        {
            curl_easy_setopt(curl, CURLOPT_VERBOSE,1);
            curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION,OnDebug);
        }
        
        curl_easy_setopt(curl, CURLOPT_URL,strUrl.c_str());
        curl_easy_setopt(curl, CURLOPT_POST,1);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS,strPost.c_str());
        curl_easy_setopt(curl, CURLOPT_READFUNCTION,NULL);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,OnWirteData);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA,(void*)&strResponse);
        curl_easy_setopt(curl, CURLOPT_NOSIGNAL,1);
        
        if(NULL == pCaPath)
        {
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER,false);
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
        }else{
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER,true);
            curl_easy_setopt(curl, CURLOPT_CAINFO,pCaPath);
        }
        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT,10);
        curl_easy_setopt(curl, CURLOPT_TIMEOUT,10);
        res = curl_easy_perform(curl);
        curl_easy_perform(curl);
        return res;
    }
    
    int CHttpClient::Gets(const std::string &strUrl, std::string &strResponse,const char* pCaPath)
    {
        CURLcode res;
        CURL* curl = curl_easy_init();
        if(NULL == curl)
        {
            return CURLE_FAILED_INIT;
        }
        if(m_Debug)
        {
            curl_easy_setopt(curl, CURLOPT_VERBOSE,1);
            curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION,OnDebug);
        }
        curl_easy_setopt(curl, CURLOPT_URL,strUrl.c_str());
        curl_easy_setopt(curl, CURLOPT_READFUNCTION,NULL);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,OnWirteData);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA,(void*)&strResponse);
        curl_easy_setopt(curl, CURLOPT_NOSIGNAL,1);
        if(NULL == pCaPath)
        {
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER,false);
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST,false);
        }else{
            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER,true);
            curl_easy_setopt(curl, CURLOPT_CAINFO,pCaPath);
        }
        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT,3);
        curl_easy_setopt(curl, CURLOPT_TIMEOUT,3);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        return res;
    }
    void CHttpClient::setDebug(bool bDebug)
    {
        m_Debug = bDebug;
    }

使用

CHttpClient* httpClient = new CHttpClient();
        httpClient->setDebug(false);
        std::string result;
        int res = httpClient->Get("http://www.baidu.com", result);
        _label1->setString(StringUtils::format("Get Statu = %d",res));
        log("result = %s",result.c_str());
        
        //post
        std::string result1;
        res = httpClient->Post("http://blog.csdn.net/yuxikuo_1?", "viewmode=list", result1);
        _label2->setString(StringUtils::format("Post Statu = %d",res));
        log("*******************");
        log("result = %s",result1.c_str());
        
        //gets
        httpClient->setDebug(false);
        std::string result2;
        int res2 = httpClient->Get("https://www.alipay.com", result2);
        _label3->setString(StringUtils::format("Get Statu = %d",res2));
        log("result = %s",result.c_str());
    
        
        delete httpClient;