**************************************************************************
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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* This software is licensed as described in the file COPYING, which
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curl_mime_subparts - set sub-parts of a multipart mime part

#include <curl/curl.h>

CURLcode curl_mime_subparts(curl_mimepart *part, curl_mime *subparts);

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 succeeds, the mime structure handle belongs to the multipart part and must not be freed explicitly. It may however be updated 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.

 /* The inline part is an alternative proposing the html and the text
 versions of the email. */
 alt = curl_mime_init(curl);

 /* 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(mime);
 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);

As long as at least one of HTTP, SMTP or IMAP is enabled. Added in 7.56.0. CURLE_OK or a CURL error code upon failure. curl_mime_addpart "(3)," curl_mime_init "(3)"