(Go) Download IMAP Message Set using FetchBundle

Demonstrates how to read IMAP emails using the FetchBundle method.

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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 with the word "test" in the subject.
    fetchUids := true
    messageSet := imap.Search("Subject test",fetchUids)
    if imap.LastMethodSuccess() != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Download the messages in a single call to FetchBundle.
    // 
    // This only makes sense if the number of emails to be downloaded is not too large.  
    // For example, you wouldn't want to download 10000 emails in a single call to FetchBundle.
    // Why? For two reasons:  (1) It could potentially cause an out-of-memory condition, and 
    // (2) it would take an extremely large amount of time.  The longer the amount of time,
    // the greater the likelihood of some kind of external networking or server problem occuring,
    // and if it happens, then you would need to re-download everything from the beginning again.
    // For large numbers of emails, it's better to loop over the emails in the message set
    // and download/process one at a time as shown here: Download IMAP Messages One at a Time
    // Downloading one message at a time makes it possible to resume the downloads rather than restart the entire operation all over again.

    // If the message set is reasonable in size, you can download all at once using FetchBundle:

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

    bundle := imap.FetchBundle(messageSet)
    if imap.LastMethodSuccess() == false {
        messageSet.DisposeMessageSet()
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Display the Subject and From of each email.
    i := 0
    numEmails := bundle.MessageCount()
    for i < numEmails {
        email := bundle.GetEmail(i)

        fmt.Println(*email.GetHeaderField("Date"))
        fmt.Println(email.Subject())
        fmt.Println(email.From())
        fmt.Println("--")

        email.DisposeEmail()
        i = i + 1
    }

    messageSet.DisposeMessageSet()
    bundle.DisposeEmailBundle()

    imap.DisposeImap()