(Go) Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

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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 to an IMAP server.
    // Use TLS
    imap.SetSsl(true)
    imap.SetPort(993)
    success := imap.Connect("imap.someMailServer.com")
    if success != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Login
    success = imap.Login("***","***")
    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
    }

    // After selecting the mailbox. the total number of emails
    // is immediately available:
    totalNum := imap.NumMessages()
    fmt.Println("Num messages = ", totalNum)

    // To determine the number of unseen messages, a call
    // to Search is required, which returns the set of UIDs
    // of all unseen messages.

    // We can choose to fetch UIDs or sequence numbers.
    fetchUids := true

    messageSet := imap.Search("UNSEEN",fetchUids)
    if imap.LastMethodSuccess() == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    numUnseen := messageSet.Count()
    fmt.Println(numUnseen)

    fmt.Println("UIDs ----")

    // Display the UIDs
    i := 0
    var msgId int
    for i < messageSet.Count() {
        msgId = messageSet.GetId(i)
        fmt.Println(msgId)
        i = i + 1
    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect()

    messageSet.DisposeMessageSet()

    imap.DisposeImap()