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C++ httpclient
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? ? 當使用C++做HTTP客戶端時，目前通用的做法就是使用libcurl。其官方網站的地址是http://curl.haxx.se/，該網站主要提供了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的命令的請求及接收回饋。libcurl提供給開發者，用于使用C++跨平臺的開發各種網絡協議的請求及響應。里面的文檔非常齊全，不過都是英文的。
??? 本文提供最簡單的demo使用libcurl開發HttpClient。主要包括同步的HTTP GET、HTTP POST、HTTPS GET、HTTPS POST。
??? 下載libcurl包，如果使用Linux平臺，建議下載源文件編譯；如果使用Windows平臺，建議下載Win32 - MSVC，下載地址是：http://curl.haxx.se/download.html
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[cpp]?view plaincopy
#ifndef?__HTTP_CURL_H__??#define?__HTTP_CURL_H__????#include?<string>????class?CHttpClient??{??public:??????CHttpClient(void);??????~CHttpClient(void);????public:??????????????????int?Post(const?std::string?&?strUrl,?const?std::string?&?strPost,?std::string?&?strResponse);???????????????????int?Get(const?std::string?&?strUrl,?std::string?&?strResponse);?????????????????????int?Posts(const?std::string?&?strUrl,?const?std::string?&?strPost,?std::string?&?strResponse,?const?char?*?pCaPath?=?NULL);????????????????????int?Gets(const?std::string?&?strUrl,?std::string?&?strResponse,?const?char?*?pCaPath?=?NULL);????public:??????void?SetDebug(bool?bDebug);????private:??????bool?m_bDebug;??};????#endif?? [cpp]?view plaincopy
#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)??????{????????????????}??????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);??????}??<pre?name="code"?class="cpp">???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);??????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??????{??????????????????????????????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;??}??</pre><p></p>??<pre></pre>??<br>??<br>??<p></p>??<br>?? 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轉載于:https://www.cnblogs.com/yulang314/p/3617960.html
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