Fetch an IMAP Attachment into a BinData

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Demonstrates the Chilkat Imap.FetchAttachmentBd method, which stores one attachment's bytes in a BinData object. The first argument is the Email, the second is the zero-based attachment index, and the third is the BinData, which is cleared before the operation. This example fetches the first attachment and prints its byte count.

Background: A BinData holds raw bytes, so it works for any attachment type — image, PDF, zip, and so on. From there you can save it, hash it, or hand it to another API expecting a byte buffer, all without touching the filesystem. Use the string/StringBuilder variants only when the attachment is known to be text.

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    success := false

    //  Demonstrates the Imap.FetchAttachmentBd method, which downloads one attachment's bytes into
    //  a BinData object.  The 1st argument is the Email, the 2nd is the zero-based attachment
    //  index, and the 3rd is the BinData (which is cleared first).
    //  
    //  The message is fetched headers-only, then the attachment is downloaded on demand.

    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)
    if numAttach > 0 {
        //  Download just the first attachment's bytes from the server into a BinData.
        bd := chilkat.NewBinData()
        success = imap.FetchAttachmentBd(email,0,bd)
        if success == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            email.DisposeEmail()
            bd.DisposeBinData()
            return
        }

        fmt.Println("Attachment size: ", bd.NumBytes(), " bytes")
    }

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


    imap.DisposeImap()
    email.DisposeEmail()
    bd.DisposeBinData()