libcurl在嵌入式设备C 的使用

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已于 2022-01-25 10:23:24 修改

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分类专栏：嵌入式文章标签： c语言 linux 开发语言

于 2018-10-30 09:33:13 首次发布

本文链接：https://blog.youkuaiyun.com/sunxiaopengsun/article/details/83536842

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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;
}