Create a multipart/alternative MIME Entity

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Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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    success := false

    //  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
    //  multipart/alternative entity, clearing any existing content.  It takes no arguments.

    mime := chilkat.NewMime()

    success = mime.NewMultipartAlternative()
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  multipart/alternative holds two representations of the SAME content; the client displays the
    //  last one it can render.  Add a plain-text part, then an HTML part.
    textPart := chilkat.NewMime()
    success = textPart.SetBodyFromPlainText("Hello (plain text version).")
    if success == false {
        fmt.Println(textPart.LastErrorText())
        mime.DisposeMime()
        textPart.DisposeMime()
        return
    }

    success = mime.AppendPart(textPart)
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        textPart.DisposeMime()
        return
    }

    htmlPart := chilkat.NewMime()
    success = htmlPart.SetBodyFromHtml("<html><body><b>Hello</b> (HTML version).</body></html>")
    if success == false {
        fmt.Println(htmlPart.LastErrorText())
        mime.DisposeMime()
        textPart.DisposeMime()
        htmlPart.DisposeMime()
        return
    }

    success = mime.AppendPart(htmlPart)
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        textPart.DisposeMime()
        htmlPart.DisposeMime()
        return
    }

    fmt.Println("Number of alternatives: ", mime.NumParts())

    mime.DisposeMime()
    textPart.DisposeMime()
    htmlPart.DisposeMime()