Hello,

I did this job a few days ago, just look at this (complete) example:
http://curl.haxx.se/libcurl/c/getinmemory.html

You have to set this two CURLOPTions:

        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback); /* send all data to this function */
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);

The first one is to set the handler function, the second one to pass the struct, which holds the char* and its size.

http://curl.haxx.se/libcurl/c/curl_easy_setopt.html

Greetings,
Alexander

--
Deutsche Telekom AG
Seamless ICT Security Infrastructure & Management
im Auftrag T-Systems International GmbH
Dipl. Inf Alexander Elgert
Langwadener Strasse 17
64625 Bensheim
+49 176 22 717 661 (Mobil)
+49 671 83419-12 (Tel)
+49 671 83419-30 (Fax)
E-Mail: alexander.elgert_at_gmx.de
________________________________________
Von: curl-users [curl-users-bounces_at_cool.haxx.se] im Auftrag von Liang LIU [mmhancxt_at_gmail.com]
Gesendet: Freitag, 2. November 2012 01:08
An: curl-users_at_cool.haxx.se
Betreff: how to set options to get return content ?
Hello everyone,
I am trying to use cURL to apply request to twitter api. For example : https://api.twitter.com/1/users/lookup.json?screen_name=twitterapi,twitter
I want to save the return content (the json object) to memory, like a char* object.  here's what I write:
  CURL *curl;
  CURLcode res;
  void* data;
  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://api.twitter.com/1/users/lookup.json?screen_name=twitterapi,twitter");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &write_data);
//curl_easy_setopt(curl, CURLINFO_PRIVATE, data);
printf("before perform.\n");
    res = curl_easy_perform(curl);
char *ct;
curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
printf("ct is : %s\n", ct);
printf("data is : %s\n", (char*)data);
    /* always cleanup */
    curl_easy_cleanup(curl);
  }
  return 0;
However every time the JSON object is printed in stdout and I can't get it in memory.
Is there some method to solve this ?
Thanks.
LIU Liang
-------------------------------------------------------------------
List admin: http://cool.haxx.se/list/listinfo/curl-users
FAQ:        http://curl.haxx.se/docs/faq.html
Etiquette:  http://curl.haxx.se/mail/etiquette.html