Fetch a Text IMAP Attachment into a StringBuilder

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Demonstrates the Chilkat Imap.FetchAttachmentSb method, which decodes one text attachment into a StringBuilder. The first argument is the Email, the second is the zero-based attachment index, the third is the charset used to decode the bytes, and the fourth is the StringBuilder, which is cleared first. This example decodes the first attachment as UTF-8.

func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Imap.FetchAttachmentSb method, which downloads one text attachment and
    //  decodes it into a StringBuilder.  The 1st argument is the Email, the 2nd is the zero-based
    //  attachment index, the 3rd is the charset used to decode, and the 4th is the StringBuilder
    //  (cleared first).
    //  
    //  The message is fetched headers-only, then the attachment is downloaded on demand.

    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
    }

    //  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    //  metadata describing the attachments is present, so the attachment info methods still work.
    var headersOnly: Bool = true
    var useUid: Bool = false
    var seqNum: Int = 1
    let email = CkoEmail()!
    success = imap.fetchEmail(headerOnly: headersOnly, msgId: seqNum, bUid: useUid, email: email)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    var numAttach: Int = imap.getMailNumAttach(email: email).intValue
    if numAttach > 0 {
        //  Download the first (text) attachment and decode it as UTF-8.  Use this only for text.
        let sb = CkoStringBuilder()!
        success = imap.fetchAttachmentSb(email: email, attachmentIndex: 0, charset: "utf-8", sb: sb)
        if success == false {
            print("\(imap.lastErrorText!)")
            return
        }

        var attachText: String? = sb.getAsString()
        print("\(attachText!)")
    }

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


}