(Go) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Note: This example requires Chilkat v11.0.0 or greater.

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    success := false

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

    imap := Imap_Ref.html">chilkat.NewImap()

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

    // Login
    success = imap.Login("****","****")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

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

    // Get the message IDs of all the emails in the mailbox
    // We can choose to fetch UIDs or sequence numbers.
    fetchUids := true
    messageSet := MessageSet_Ref.html">chilkat.NewMessageSet()
    success = imap.QueryMbx("ALL",fetchUids,messageSet)
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        messageSet.DisposeMessageSet()
        return
    }

    numFound := messageSet.Count()
    if numFound == 0 {
        fmt.Println("No messages found.")
        imap.DisposeImap()
        messageSet.DisposeMessageSet()
        return
    }

    // Get the 1st 10 messages in messageSet.
    upperBound := 10
    if numFound < upperBound {
        upperBound = numFound
    }

    i := 0
    bUid := messageSet.HasUids()
    headerOnly := true
    email := Email_Ref.html">chilkat.NewEmail()

    for i < upperBound {

        success = imap.FetchEmail(headerOnly,*messageSet.GetId(i),bUid,email)
        if success == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            messageSet.DisposeMessageSet()
            email.DisposeEmail()
            return
        }

        fmt.Println(i, ": ", email.Subject())

        i = i + 1
    }

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

    imap.DisposeImap()
    messageSet.DisposeMessageSet()
    email.DisposeEmail()