(Go) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    imap := chilkat.NewImap()

    // Connect using TLS.
    imap.SetSsl(true)
    imap.SetPort(993)
    success := imap.Connect("imap.example.com")
    if success != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Authenticate
    success = imap.Login("email_account_login","email_account_password")
    if success != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox")
    if success != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Search for messages and return a set of matching messages.
    // (This example will simply search for ALL messages.)
    fetchUids := true
    messageSet := imap.Search("ALL",fetchUids)
    if imap.LastMethodSuccess() != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    fmt.Println("Number of messages = ", messageSet.Count())

    i := 0
    for i < messageSet.Count() {
        email := imap.FetchSingle(*messageSet.GetId(i),fetchUids)
        if imap.LastMethodSuccess() != true {
            fmt.Println(imap.LastErrorText())
            messageSet.DisposeMessageSet()
            imap.DisposeImap()
            return
        }

        fmt.Println(email.From(), "; ", email.Subject())
        email.DisposeEmail()

        i = i + 1
    }

    messageSet.DisposeMessageSet()

    fmt.Println("OK")

    imap.DisposeImap()