Fetch a Single Message's MIME into a StringBuilder

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Demonstrates the Chilkat Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a StringBuilder. The first argument is the message id, the second (bUid) selects UID vs sequence number, and the third is the StringBuilder, which is cleared first. This example downloads a message by UID and prints the MIME length.

// Demonstrates the Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a
// StringBuilder.  The 1st argument is the message id, the 2nd (bUid) selects UID vs sequence
// number, and the 3rd is the StringBuilder (cleared first).

let imap = chilkat::Imap::new();

imap.set_ssl(true);
imap.set_port(993);

if imap.connect("imap.example.com").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if imap.login("user@example.com", "myPassword").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if imap.select_mailbox("Inbox").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// Search for the message ids to download, returning UIDs.
let want_uids = true;
let msg_set = chilkat::MessageSet::new();
if imap.query_mbx("ALL", want_uids, &msg_set).is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if msg_set.count() > 0 {
    let uid = msg_set.get_id(0);

    // Download the message's MIME into a StringBuilder.  The id is a UID.
    let use_uid = true;
    let sb_mime = chilkat::StringBuilder::new();
    if imap.fetch_single_as_mime_sb(uid, use_uid, &sb_mime).is_err() {
        println!("{}", imap.last_error_text());
        return;
    }

    println!("MIME length: {} chars", sb_mime.length());
}

if imap.disconnect().is_err() {
    println!("{}", imap.last_error_text());
    return;
}