curl_mime_subparts(3) Library Functions Manual curl_mime_subparts(3)
NAME
curl_mime_subparts - set sub-parts of a multipart mime part
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_mime_subparts(curl_mimepart *part, curl_mime *subparts);
DESCRIPTION
curl_mime_subparts(3) sets a multipart mime part's content from a mime
structure.
part is a handle to the multipart part.
subparts is a mime structure handle holding the sub-parts. After
curl_mime_subparts(3) succeeds, the mime structure handle belongs to the
multipart part and must not be freed explicitly. It may however be up-
dated by subsequent calls to mime API functions.
Setting a part's contents multiple times is valid: only the value set by
the last call is retained. It is possible to unassign previous part's
contents by setting subparts to NULL.
PROTOCOLS
This functionality affects http, imap and smtp
EXAMPLE
static char *inline_html = "<title>example</title>";
static char *inline_text = "once upon the time";
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
struct curl_slist *slist;
/* The inline part is an alternative proposing the html and the text
versions of the email. */
curl_mime *alt = curl_mime_init(curl);
curl_mimepart *part;
/* HTML message. */
part = curl_mime_addpart(alt);
curl_mime_data(part, inline_html, CURL_ZERO_TERMINATED);
curl_mime_type(part, "text/html");
/* Text message. */
part = curl_mime_addpart(alt);
curl_mime_data(part, inline_text, CURL_ZERO_TERMINATED);
/* Create the inline part. */
part = curl_mime_addpart(alt);
curl_mime_subparts(part, alt);
curl_mime_type(part, "multipart/alternative");
slist = curl_slist_append(NULL, "Content-Disposition: inline");
curl_mime_headers(part, slist, 1);
}
}
AVAILABILITY
Added in curl 7.56.0
RETURN VALUE
This function returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3). If CURLOPT_ERRORBUFFER(3) was set with
curl_easy_setopt(3) there can be an error message stored in the error
buffer when non-zero is returned.
SEE ALSO
curl_mime_addpart(3), curl_mime_init(3)
libcurl 2026-07-12 curl_mime_subparts(3)
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