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.

func chilkatTest() {
    var success: Bool = false

    //  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 = CkoImap()!

    imap.ssl = true
    imap.port = 993

    success = imap.connect(hostname: "imap.example.com")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    success = imap.login(login: "user@example.com", password: "myPassword")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    success = imap.selectMailbox(mailbox: "Inbox")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    //  Search for the message ids to download, returning UIDs.
    var wantUids: Bool = true
    let msgSet = CkoMessageSet()!
    success = imap.queryMbx(criteria: "ALL", bUid: wantUids, msgSet: msgSet)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    if msgSet.count.intValue > 0 {
        var uid: UInt32 = msgSet.getId(index: 0)

        //  Download the message's MIME into a StringBuilder.  The id is a UID.
        var useUid: Bool = true
        let sbMime = CkoStringBuilder()!
        success = imap.fetchSingle(asMimeSb: uid, bUid: useUid, sbMime: sbMime)
        if success == false {
            print("\(imap.lastErrorText!)")
            return
        }

        print("MIME length: \(sbMime.length.intValue) chars")
    }

    success = imap.disconnect()
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }


}