Viewing file:  post-callback.c (3.59 KB) -rw-r--r--
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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* $Id: post-callback.c,v 1.4 2004/08/23 14:22:44 bagder Exp $
*
* An example source code that issues a HTTP POST and we provide the actual
* data through a read callback.
*
*/
#include <stdio.h>
#include <string.h>
#include <curl/curl.h>
char data[]="this is what we post to the silly web server";
struct WriteThis {
char *readptr;
int sizeleft;
};
size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
{
struct WriteThis *pooh = (struct WriteThis *)userp;
if(size*nmemb < 1)
return 0;
if(pooh->sizeleft) {
*(char *)ptr = pooh->readptr[0]; /* copy one single byte */
pooh->readptr++; /* advance pointer */
pooh->sizeleft--; /* less data left */
return 1; /* we return 1 byte at a time! */
}
return -1; /* no more data left to deliver */
}
int main(void)
{
CURL *curl;
CURLcode res;
struct WriteThis pooh;
pooh.readptr = data;
pooh.sizeleft = strlen(data);
curl = curl_easy_init();
if(curl) {
/* First set the URL that is about to receive our POST. */
curl_easy_setopt(curl, CURLOPT_URL,
"http://receivingsite.com.pooh/index.cgi");
/* Now specify we want to POST data */
curl_easy_setopt(curl, CURLOPT_POST, TRUE);
/* we want to use our own read function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
/* pointer to pass to our read function */
curl_easy_setopt(curl, CURLOPT_READDATA, &pooh);
/* get verbose debug output please */
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
/*
If you use POST to a HTTP 1.1 server, you can send data without knowing
the size before starting the POST if you use chunked encoding. You
enable this by adding a header like "Transfer-Encoding: chunked" with
CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must
specify the size in the request.
*/
#ifdef USE_CHUNKED
{
curl_slist *chunk = NULL;
chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked");
res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER);
/* use curl_slist_free_all() after the *perform() call to free this
list again */
}
#else
/* Set the expected POST size. If you want to POST large amounts of data,
consider CURLOPT_POSTFIELDSIZE_LARGE */
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, pooh.sizeleft);
#endif
#ifdef DISABLE_EXPECT
/*
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
header. You can disable this header with CURLOPT_HTTPHEADER as usual.
NOTE: if you want chunked transfer too, you need to combine these two
since you can only set one list of headers with CURLOPT_HTTPHEADER. */
/* A less good option would be to enforce HTTP 1.0, but that might also
have other implications. */
{
curl_slist *chunk = NULL;
chunk = curl_slist_append(chunk, "Expect:");
res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER);
/* use curl_slist_free_all() after the *perform() call to free this
list again */
}
#endif
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
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