本文主要是介绍libcurl在嵌入式设备C 的使用,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
libcurl在嵌入式设备C 的使用_bingqingsuimeng的专栏-CSDN博客
linux:
./configure --prefix=/root/work/code/curl-7.61.1/curl_linux --disable-shared --enable-static --without-libidn --without-ssl --without-librtmp --without-gnutls --without-nss --without-libssh2 --without-zlib --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6
arm:
./configure --host=arm-hisiv300-linux --prefix=/root/work/code/curl-7.61.1/curl_arm CC=arm-hisiv300-linux-gcc --disable-shared --enable-static --without-libidn --without-ssl --without-librtmp --without-gnutls --without-nss --without-libssh2 --without-zlib --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6
增加 https协议
./configure --host=arm-hisiv300-linux --prefix=/root/work/code/curl-7.61.1/curl_arm2 CC=arm-hisiv300-linux-gcc --disable-shared --enable-static --without-libidn -with-ssl=/root/work/code/BaseCore/src/rtmpdump/rtmpobj
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 __HTTP_CURL_H__
#define __HTTP_CURL_H__#include <string>class CHttpClient
{
public:CHttpClient(void);~CHttpClient(void);public:/*** @brief HTTP POST请求* @param strUrl 输入参数,请求的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,返回的内容* @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:http://www.baidu.com* @param strResponse 输出参数,返回的内容* @return 返回是否Post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,使用如下格式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Post成功*/int Posts(const std::string & strUrl, const std::string & strPost, std::string & strResponse, const char * pCaPath = NULL);/*** @brief HTTPS GET请求,无证书版本* @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,则不验证服务器端证书的有效性.* @return 返回是否Post成功*/int Gets(const std::string & strUrl, std::string & strResponse, const char * pCaPath = NULL);public:void SetDebug(bool bDebug);private:bool m_bDebug;
};#endif
#include "httpclient.h"
#include "curl/curl.h"
#include <string>CHttpClient::CHttpClient(void) :
m_bDebug(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 OnWriteData(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_bDebug){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, OnWriteData);curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);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;
}int CHttpClient::Get(const std::string & strUrl, std::string & strResponse)
{CURLcode res;CURL* curl = curl_easy_init();if(NULL == curl){return CURLE_FAILED_INIT;}if(m_bDebug){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, OnWriteData);curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);/*** 当多个线程都使用超时处理的时候,同时主线程中有sleep或是wait等操作。* 如果不设置这个选项,libcurl将会发信号打断这个wait从而导致程序退出。*/curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);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;
}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_bDebug){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, OnWriteData);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{//缺省情况就是PEM,所以无需设置,另外支持DER//curl_easy_setopt(curl,CURLOPT_SSLCERTTYPE,"PEM");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;
}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_bDebug){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, OnWriteData);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_bDebug = bDebug;
}
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