curl_formfree(3) Library Functions Manual curl_formfree(3)

curl_formfree - free a previously build multipart form post chain

#include <curl/curl.h>
void curl_formfree(struct curl_httppost *form);

This function is deprecated. Do not use. See curl_mime_init(3) instead!

curl_formfree() is used to clean up data previously built/appended with curl_formadd(3). This must be called when the data has been used, which typically means after curl_easy_perform(3) has been called.

The pointer to free is the same pointer you passed to the CURLOPT_HTTPPOST(3) option, which is the firstitem pointer from the curl_formadd(3) invoke(s).

form is the pointer as returned from a previous call to curl_formadd(3) and may be NULL.

Passing in a NULL pointer in form makes this function return immediately with no action.

HTTP

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    struct curl_httppost *formpost;
    struct curl_httppost *lastptr;
    /* Fill in a file upload field */
    curl_formadd(&formpost,
                 &lastptr,
                 CURLFORM_COPYNAME, "file",
                 CURLFORM_FILE, "nice-image.jpg",
                 CURLFORM_END);
    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
    curl_easy_perform(curl);
    /* then cleanup the formpost chain */
    curl_formfree(formpost);
  }
}

Deprecated in 7.56.0.

None

curl_formadd(3), curl_mime_free(3), curl_mime_init(3)

2024-05-22 libcurl