curl_mime_init(3) Library Functions Manual curl_mime_init(3)

curl_mime_init - create a mime handle

#include <curl/curl.h>
curl_mime *curl_mime_init(CURL *easy_handle);

curl_mime_init(3) creates a handle to a new empty mime structure. This mime structure can be subsequently filled using the mime API, then attached to some easy handle using option CURLOPT_MIMEPOST(3) within a curl_easy_setopt(3) call or added as a multipart in another mime handle's part using curl_mime_subparts(3).

easy_handle is used for part separator randomization and error reporting. Since 7.87.0, it does not need to be the final target handle.

Using a mime handle is the recommended way to post an HTTP form, format and send a multi-part email with SMTP or upload such an email to an IMAP server.


int main(void)
  CURL *easy = curl_easy_init();
  curl_mime *mime;
  curl_mimepart *part;
  /* Build an HTTP form with a single field named "data", */
  mime = curl_mime_init(easy);
  part = curl_mime_addpart(mime);
  curl_mime_data(part, "This is the field data", CURL_ZERO_TERMINATED);
  curl_mime_name(part, "data");
  /* Post and send it. */
  curl_easy_setopt(easy, CURLOPT_MIMEPOST, mime);
  curl_easy_setopt(easy, CURLOPT_URL, "");
  /* Clean-up. */

As long as at least one of HTTP, SMTP or IMAP is enabled. Added in 7.56.0.

A mime struct handle, or NULL upon failure.

CURLOPT_MIMEPOST(3), curl_mime_addpart(3), curl_mime_free(3), curl_mime_subparts(3)

2024-05-22 libcurl