C++Socket编程—Libcurl库

一、LibCurl基本编程框架
libcurl是一个跨平台的网络协议库，支持http, https, ftp, gopher, telnet, dict, file, 和ldap 协议。libcurl同样支持HTTPS证书授权，HTTP POST, HTTP PUT, FTP 上传, HTTP基本表单上传，代理，cookies,和用户认证.

 

win32版的libcurl下载地址:http://curl.freeby.pctools.cl/download/libcurl-7.18.0-win32-msvc.zip

 

代码示例：调用libcurl模拟发送http包，并获取位置

 

 

 

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#include <iostream> #include "curl/curl.h" #include <string>   #pragma comment(lib, "libcurl.lib")   using namespace std;   const char* UTF8_To_GBK(const char* source, char* pcDes); string strUtf8;   size_t WriteCallback(char* ptr, size_t size, size_t nmemb, void* userdata) {     //printf(ptr);     strUtf8 += ptr;     return size * nmemb; //处理了所有的数据 }    //初始化库，进程生命周期只调用一次     curl_global_init(CURL_GLOBAL_ALL);     /*     发送请求     */     //创建请求的句柄     CURL* handle = curl_easy_init();       //设置url     CURLcode nRetCode=curl_easy_setopt(handle, CURLOPT_URL, "http://ip.tool.chinaz.com/");       //设置代理，是fidder可以抓到包     nRetCode = curl_easy_setopt(handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);       //设置处理响应包的回调函数     nRetCode=curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, WriteCallback);     //设置为fidder的代理地址     nRetCode = curl_easy_setopt(handle, CURLOPT_PROXY, "127.0.0.1:8888");           //为请求添加头部     curl_slist* chunk = NULL;     chunk = curl_slist_append(chunk, "Host: ip.tool.chinaz.com");     chunk = curl_slist_append(chunk, "User-Agent: Mozilla / 5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko / 20100101 Firefox / 75.0");     chunk = curl_slist_append(chunk, "Accept : text / html, application / xhtml + xml, application / xml; q = 0.9, image / webp, */*;q=0.8");     chunk = curl_slist_append(chunk, "Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2");     //chunk = curl_slist_append(chunk, "Accept-Encoding: gzip, deflate");//免解压缩     chunk = curl_slist_append(chunk, "Connection: keep-alive");     chunk = curl_slist_append(chunk, "Upgrade-Insecure-Requests: 1");     curl_easy_setopt(handle, CURLOPT_HTTPHEADER, chunk);         //发送请求     nRetCode = curl_easy_perform(handle);       //处理数据       char* pBuff = new char[strUtf8.size()];     UTF8_To_GBK(strUtf8.c_str(), pBuff);     //printf(pBuff);       string strGbk = pBuff;     delete[] pBuff;       //正则查找位置     size_t nOff = strGbk.find("来自");     size_t nOffBegin = strGbk.find("<dd>", nOff);     size_t nOffEnd = strGbk.find("<a href", nOffBegin + 4);     string strLocation = strGbk.substr(nOffBegin + 4, nOffEnd - (nOffBegin + 4));     printf(strLocation.c_str());       //反初始化，进程生命周期只调用一次     curl_global_cleanup;       return 0; }   const char* UTF8_To_GBK(const char* source, char* pcDes) {     enum { GB2312 = 936 };     //unsigned long len;     int len = -1;     len = ::MultiByteToWideChar(CP_UTF8, NULL, source, -1, NULL, NULL);     if (len == 0)         return NULL;     wchar_t* wide_char_buffer = new wchar_t[len];     ::MultiByteToWideChar(CP_UTF8, NULL, source, -1, wide_char_buffer, len);     len = ::WideCharToMultiByte(GB2312, NULL, wide_char_buffer, -1, NULL, NULL, NULL, NULL);     if (len == 0)     {         delete[] wide_char_buffer;         return NULL;     }     char* multi_byte_buffer = new char[len];     ::WideCharToMultiByte(GB2312, NULL, wide_char_buffer, -1, multi_byte_buffer, len, NULL, NULL);     strcpy(pcDes, multi_byte_buffer);     //std::string dest(multi_byte_buffer);     delete[] multi_byte_buffer;     delete[] wide_char_buffer;     return pcDes; }