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          #include "stdafx.h"
          #include "curl/curl.h"
          #pragma comment(lib, "libcurl.lib")
          static size_t write_buff_data(char *buffer, size_t size, size_t nitems, void *outstream)
          {
            memcpy(outstream, buffer, nitems*size);
            return nitems*size;
          }
          
          int GetUrlHTTP(char *url, char *buff)
          {
            CURL *curl;
            CURLcode res;
            curl = curl_easy_init();
            if (curl)
            {
              curl_easy_setopt(curl, CURLOPT_PROXY,"http://host:port");
              curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "users:password");
              curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);
              curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);
              curl_easy_setopt(curl, CURLOPT_URL, url);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);
              curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);
          
              res = curl_easy_perform(curl);
              curl_easy_cleanup(curl);
              if (res == CURLE_OK){
                return res;
              }else {
                printf("error:%d\n", res);
                MessageBox(NULL, TEXT("Get Ip Error"), TEXT("Help"), MB_ICONINFORMATION | MB_YESNO);
              }
            }
            return res;
          }
          
          int GetUrlSocks5(char *url, char *buff)
          {
            CURL *curl;
            CURLcode res;
            curl = curl_easy_init();
            if (curl)
            {
              curl_easy_setopt(curl, CURLOPT_PROXY, "socks5://host:port");
              curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "users:password");
              curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);
              curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);
              curl_easy_setopt(curl, CURLOPT_URL, url);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);
              curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);
              res = curl_easy_perform(curl);
              curl_easy_cleanup(curl);
              if (res == CURLE_OK) {
                return res;
              }
              else {
                printf("error:%d\n", res);
                MessageBox(NULL, TEXT("Get Ip Error"), TEXT("Help"), MB_ICONINFORMATION | MB_YESNO);
              }
            }
            return res;
          }
          
          int GetUrl(char *url, char *buff)
          {
            CURL *curl;
            CURLcode res;
            curl = curl_easy_init();
            if (curl)
            {
              curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);
              curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);
              curl_easy_setopt(curl, CURLOPT_URL, url);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);
              curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);
              curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);
              res = curl_easy_perform(curl);
              curl_easy_cleanup(curl);
              if (res == CURLE_OK)
              {
                return res;
              }
              else {
                printf("error:%d\n", res);
                MessageBox(NULL, TEXT("Get Ip Error"), TEXT("Help"), MB_ICONINFORMATION | MB_YESNO);
              }
            }
            return res;
          }
          
          int main()
          {
            char *buff=(char*)malloc(1024*1024);
            memset(buff, 0, 1024 * 1024);
            //Test 1
            GetUrl("http://ipinfo.io", buff);
            printf("No Proxy：%s\n", buff);
            //Test 2
            memset(buff, 0, 1024 * 1024);
            GetUrlHTTP("http://ipinfo.io", buff);
            printf("Proxy By Http：%s\n", buff);
            //Test 3
            memset(buff, 0,1024 * 1024);
            GetUrlSocks5("http://ipinfo.io", buff);
            printf("Proxy by socks5：%s\n", buff);
          
            Sleep(1000 * 1000);
            free(buff);
              return 0;
          }