(Go) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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
    }

    // messageSet is a MessageSet
    // We can choose to fetch UIDs or sequence numbers.
    fetchUids := true
    // Get the message IDs of all the emails in the mailbox
    messageSet := imap.Search("ALL",fetchUids)
    if imap.LastMethodSuccess() != true {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // When downloading headers, each email object contains
    // (obviously) the headers, but the body will be missing.
    // Also, attachments will not be included.  However, it is
    // possible to get information about the attachments
    // as well as the complete size of the email.
    // bundle is a EmailBundle
    bundle := imap.FetchHeaders(messageSet)
    if imap.LastMethodSuccess() != true {
        messageSet.DisposeMessageSet()
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Loop over the email objects and display information
    // about each:
    var i int
    for i = 0; i <= bundle.MessageCount() - 1; i++ {
        // email is a Email
        email := bundle.GetEmail(i)

        // Display the From and Subject
        fmt.Println(email.From())
        fmt.Println(email.Subject())

        // Display the recipients:
        var j int
        var name *string = new(string)
        var addr *string = new(string)
        for j = 0; j <= email.NumTo() - 1; j++ {
            name = email.GetToName(j)
            addr = email.GetToAddr(j)
            fmt.Println(*name, ", ", *addr)
        }

        for j = 0; j <= email.NumCC() - 1; j++ {
            name = email.GetCcName(j)
            addr = email.GetCcAddr(j)
            fmt.Println(*name, ", ", *addr)
        }

        // Show the total size of the email, including body and attachments:
        fmt.Println(email.Size())

        // When a full email is downloaded, we would use the
        // email.NumAttachments property in conjunction with the
        // email.GetMailAttach* methods.
        // However, when an email object contains only the header,
        // we need to access the attachment info differently:
        numAttach := imap.GetMailNumAttach(email)
        for j = 0; j <= numAttach - 1; j++ {
            fmt.Println(*imap.GetMailAttachFilename(email,j))
            attachSize := imap.GetMailAttachSize(email,j)
            fmt.Println("    size = ", attachSize, " bytes")
        }

        fmt.Println("--")
        email.DisposeEmail()
    }

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

    messageSet.DisposeMessageSet()
    bundle.DisposeEmailBundle()

    imap.DisposeImap()