Convert a MIME Entity to multipart/mixed

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Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

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    success := false

    mime := chilkat.NewMime()
    success = mime.LoadMimeFile("qa_data/message.eml")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
    //  first child, which is what you do to add attachments to an existing single-part message.
    success = mime.ConvertToMultipartMixed()
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  Now attachments can be appended alongside the original content.
    success = mime.AppendPartFromFile("qa_data/report.pdf")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

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

    mime.DisposeMime()