how to use cookies and postfields with libcurl in C? -

when

curl --get --cookie-jar mycookie.cookie http://mypage/page/ 

it store cookie mycookie.cookie

and when

curl --cookie mycookie.cookie --data "field1=field1" --data "field2=field2" --data csrfmiddlewaretoken=(csrf token) http://mypage/page/register/ 

the csrf token through cat mycookie.cookie , fill manually in.

this works. want.

so want use libcurl c this. following doc have this:

  curl *curl;   curlcode res;    curl_global_init(curl_global_all);   curl = curl_easy_init();   if (curl) {      curl_easy_setopt(curl, curlopt_url, http://mypage/page/);     curl_easy_setopt(curl, curlopt_verbose, 1l);     curl_easy_setopt(curl, curlopt_cookiefile, "");       res = curl_easy_perform(curl);      res = curl_easy_getinfo(curl, curlinfo_cookielist, &cookies);     curl_easy_setopt(curl, curlopt_url, http://mypage/page/register/);     curl_easy_setopt(curl, curlopt_cookiefile, cookies);     curl_easy_setopt(curl, curlopt_postfields, "field1=field1;field1=field1;csrfmiddlewaretoken=(csrf token)");     res = curl_easy_perform(curl);       printf("erasing curl's knowledge of cookies!\n");     curl_easy_setopt(curl, curlopt_cookielist, "all");     curl_slist_free_all(cookies);  }   curl_global_cleanup();   return 0; 

so pass cookie throw error missing fields. thought line post fields:

curl_easy_setopt(curl, curlopt_postfields, "field1=field1;field1=field1;csrfmiddlewaretoken=(csrf token)"); 

i tried passing fields through line:

curl_easy_setopt(curl, curlopt_cookiefile, cookies); 

by riding in char array

i tried replacing , ; nothing works.

i don't think wrote wrong, looks more post overwrite each other, because if run programm without cookiefile line says missing cookie.

any idea, how post necessary pieces information?

edit

ok, got work through these 2 posts here , here , daniel stenberg

so have same code without

curl_easy_setopt(curl, curlopt_cookiefile, cookies); 

1. your string sent curlopt_postfields different string command line uses! when use --data multiple times, curl concatenate strings ampersand (&) in between, while c code uses semicolon.

2. you pass wrong input curlopt_cookiefile. accepts file name, nothing else. don't need use option in second request, since enabled "cookie engine" in first request, cookies recieved in first request kept in curl handle , used in subsequent request anyway when reusing handle.

3. to extract csrf_token cookie, use curlinfo_cookielist , parse through list of cookies find it, extract contents , use in subsequent post request.