curl_formget(3) Library Functions Manual curl_formget(3)
NAME
curl_formget - serialize a multipart form POST chain
SYNOPSIS
#include <curl/curl.h>
int curl_formget(struct curl_httppost * form, void *userp,
curl_formget_callback append);
DESCRIPTION
The form API (including this function) is deprecated since libcurl
7.56.0.
curl_formget() serializes data previously built with curl_formadd(3). It
accepts a void pointer as second argument named userp which is passed as
the first argument to the curl_formget_callback function.
typedef size_t (*curl_formget_callback)(void *userp, const char *buf,
size_t len);"
The curl_formget_callback is invoked for each part of the HTTP POST
chain. The character buffer passed to the callback must not be freed.
The callback should return the buffer length passed to it on success.
If the CURLFORM_STREAM option is used in the formpost, it prevents
curl_formget(3) from working until you have performed the actual HTTP
request. This, because first then does libcurl known which actual read
callback to use.
PROTOCOLS
This functionality affects http only
EXAMPLE
size_t print_httppost_callback(void *arg, const char *buf, size_t len)
{
fwrite(buf, len, 1, stdout);
(*(size_t *) arg) += len;
return len;
}
size_t print_httppost(struct curl_httppost *post)
{
size_t total_size = 0;
if(curl_formget(post, &total_size, print_httppost_callback)) {
return (size_t) -1;
}
return total_size;
}
AVAILABILITY
Added in curl 7.15.5
RETURN VALUE
0 means everything was OK, non-zero means an error occurred
SEE ALSO
curl_formadd(3), curl_mime_init(3)
libcurl 2026-07-12 curl_formget(3)
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