Get IMAP Attachment Sizes

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Demonstrates the Chilkat Imap.GetMailAttachSize method, which returns the size in bytes of an attachment. The first argument is the Email and the second is the zero-based attachment index. This example fetches headers only and prints each attachment's name and size.

Background: Like the attachment filename, the size comes from ckx-imap-* metadata and is available from a header-only fetch without downloading the body. A client can therefore show attachment sizes in a message preview, and decide whether to auto-download or prompt before pulling a large file.

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    success := false

    //  Demonstrates the Imap.GetMailAttachSize method, which returns the size in bytes of an
    //  attachment.  The 1st argument is the Email and the 2nd is the zero-based attachment index.

    imap := chilkat.NewImap()

    imap.SetSsl(true)
    imap.SetPort(993)

    success = imap.Connect("imap.example.com")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    success = imap.Login("user@example.com","myPassword")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    success = imap.SelectMailbox("Inbox")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    //  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    //  metadata describing the attachments is present, so the attachment info methods still work.
    headersOnly := true
    useUid := false
    seqNum := 1
    email := chilkat.NewEmail()
    success = imap.FetchEmail(headersOnly,seqNum,useUid,email)
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        email.DisposeEmail()
        return
    }

    numAttach := imap.GetMailNumAttach(email)
    var i int
    for i = 0; i <= numAttach - 1; i++ {
        fname := imap.GetMailAttachFilename(email,i)
        if imap.LastMethodSuccess() == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            email.DisposeEmail()
            return
        }

        sz := imap.GetMailAttachSize(email,i)
        fmt.Println(*fname, ": ", sz, " bytes")
    }

    success = imap.Disconnect()
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        email.DisposeEmail()
        return
    }


    imap.DisposeImap()
    email.DisposeEmail()