Fetch a Text IMAP Attachment as a String

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Demonstrates the Chilkat Imap.FetchAttachmentString method, which returns one text attachment decoded to a string. The first argument is the Email, the second is the zero-based attachment index, and the third is the charset used to decode the bytes. This example returns the first attachment as a UTF-8 string.

Background: This is the convenient form when you simply want a small text attachment's content inline as a string. Only use it for attachments known to be text; decoding binary content through a charset can alter or corrupt the bytes. For binary data use FetchAttachmentBd, and for large text a StringBuilder (via FetchAttachmentSb) avoids an extra copy.

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    success := false

    //  Demonstrates the Imap.FetchAttachmentString method, which downloads one text attachment and
    //  returns it decoded to a string.  The 1st argument is the Email, the 2nd is the zero-based
    //  attachment index, and the 3rd is the charset used to decode the bytes.
    //  
    //  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 {
        //  FetchAttachmentString returns a string, so assign it to a string variable.
        attachText := imap.FetchAttachmentString(email,0,"utf-8")
        if imap.LastMethodSuccess() == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            email.DisposeEmail()
            return
        }

        fmt.Println(*attachText)
    }

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


    imap.DisposeImap()
    email.DisposeEmail()