[curl lib]我如何獲得響應/重定向url？

Question

如果我訪問http://www.microsoft.com/ 會重定向到http://www.microsoft.com/en-us/default.aspx

我怎樣才能得到響應/使用curl LIB重定向URL？

我嘗試 curl_easy_getinfo（curl，CURLINFO_EFFECTIVE_URL，& reUrl）; 這將讓http://www.microsoft.com/

curl_easy_getinfo（捲曲，CURLINFO_REDIRECT_URL，& reUrl）; 這總是會得到NULL

所以感謝你的幫助

Answer 1

設置CURLOPT_FOLLOWLOCATION到1

#include <stdio.h> 
#include <curl/curl.h> 

int main(int argc, char** argv) 
{ 
    CURL *curl; 
    CURLcode curl_res; 

    curl_global_init(CURL_GLOBAL_ALL); 

    curl = curl_easy_init(); 

    if (curl) 
    { 
     curl_easy_setopt(curl, CURLOPT_URL, "http://www.microsoft.com"); 
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1); 
     curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"); 

     /* Perform the request, curl_res will get the return code */ 
     curl_res = curl_easy_perform(curl); 

     /* Check for errors */ 
     if(curl_res != CURLE_OK) 
      fprintf(stderr, "curl_easy_perform() failed: %s\n", 
        curl_easy_strerror(curl_res)); 

     if(CURLE_OK == curl_res) 
     { 
      char *url; 
      curl_res = curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &url); 

      if((CURLE_OK == curl_res) && url) 
       printf("CURLINFO_EFFECTIVE_URL: %s\n", url); 
     } 

     /* always cleanup */ 
     curl_easy_cleanup(curl); 

     /* we're done with libcurl, so clean it up */ 
     curl_global_cleanup(); 

    } 
    else 
    { 
     printf("cURL error.\n"); 
    } 

    return 0; 
} 

您將看到：

CURLINFO_EFFECTIVE_URL: http://www.microsoft.com/en-us/default.aspx