Post data to http server using libcurl

[Raj]

Hi,
I am newbie to programming with libcurl. the problem is i want to send
my gmail username and password outside the browser and get access to my
mail. this i am doing with LibCurl. Though i dont get any errors, i am
nt able to get the o/p Can anyone kindly help. i will attach the
program here
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>

int main(int argc, char *argv[])
{
CURL *curl;
CURLcode res;

struct curl_httppost *formpost=NULL;
struct curl_httppost *lastptr=NULL;
struct curl_slist *headerlist=NULL;
char buf[] = "Expect:";

curl_global_init(CURL_GLOBAL_ALL);

/* Fill in the file upload field */
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "rajani.vemula",
CURLFORM_END);

/* Fill in the filename field */
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "xxxxx",
CURLFORM_END);
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "null",
CURLFORM_COPYCONTENTS, "Sign in",
CURLFORM_END);


curl = curl_easy_init();
/* initalize custom header list (stating that Expect: 100-continue
is
not
wanted */
headerlist = curl_slist_append(headerlist, buf);
if(curl) {
/* what URL that receives this POST */
curl_easy_setopt(curl, CURLOPT_URL,"
http://mail.google.com/mail");
curl_easy_setopt(curl, CURLOPT_PROXY, "proxyname");
curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "User:Password)";
/* only disable 100-continue header if explicitly requested */
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
res = curl_easy_perform(curl);

/* always cleanup */
curl_easy_cleanup(curl);

/* then cleanup the formpost chain */
curl_formfree(formpost);
curl_slist_free_all(headerlist
}
return 0;
}

Thanks