Post data with libcurl - c++

Question

I've problem with libcurl. I wrote simple program which should post data (fill the form) but program's not working.
My form:
...
<div><label for="id_person_name">Your name</label> <input type="text" id="id_person_name" name="name" /></div>
<div></div>
<div class="clear"></div>
<div><label for="id_comment">Comment</label><textarea name="comment" id="id_comment" rows="10" cols="60" class="txt"></textarea></div>
...
Program:
#include <curl/curl.h>
#include <iostream>
using namespace std;
int main(){
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://examplesite.com");
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "name=Bjarne&comment=example");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
cout << endl;
}
return 0;
}
Of course i tested this code: http://curl.haxx.se/libcurl/c/postit2.html but it's not working.
Can anyone help me ?

Answer 1

you need to set CURLOPT_URL to address which <form> points, as shown here, for example.
The code from the above link is:
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel#haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/* <DESC>
* simple HTTP POST using the easy interface
* </DESC>
*/
#include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
/* First set the URL that is about to receive our POST. This URL can
just as well be a https:// URL if that is what should receive the
data. */
curl_easy_setopt(curl, CURLOPT_URL, "http://postit.example.com/moo.cgi");
/* Now specify the POST data */
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "name=daniel&project=curl");
/* 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));
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}