On Wed, 22 Mar 2017, Michael via curl-library wrote:

> curl_easy_getinfo(curl, CURLINFO_PRIMARY_IP,&ip);curl_easy_setopt(curl,
> CURLOPT_READDATA, &ip); like this it's the same.

Works perfectly for me:

int main(void)
{
   CURL *curl;
   CURLcode res;

   curl = curl_easy_init();
   if(curl) {
     char *ip;

     curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
     /* example.com is redirected, so we tell libcurl to follow redirection */
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

     /* Perform the request, res will get the return code */
     res = curl_easy_perform(curl);
     /* Check for errors */
     if(res != CURLE_OK)
       fprintf(stderr, "curl_easy_perform() failed: %s\n",
               curl_easy_strerror(res));

     if(!curl_easy_getinfo(curl, CURLINFO_PRIMARY_IP, &ip)) {
       printf("IP: %s\n", ip);
     }

     /* always cleanup */
     curl_easy_cleanup(curl);
   }
   return 0;
}

-- 
  / daniel.haxx.se
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