Convert 8-bit MIME Parts to Base64

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Demonstrates the Chilkat Mime.Convert8Bit method, which recursively converts every part whose Content-Transfer-Encoding is 8bit or binary to base64. It takes no arguments and is a void method.

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: The original SMTP standard only guaranteed 7-bit transport, and some legacy servers still reject or mangle raw 8-bit and binary content. Converting those parts to base64 — a 7-bit-safe encoding — makes the whole message safe to relay through such systems without loss. It walks the entire tree, so a multipart message with several offending parts is fixed in one call.

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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
    }

    //  Recursively convert every part whose Content-Transfer-Encoding is 8bit or binary to base64.
    //  This makes the MIME safe to transmit over channels that only support 7-bit text (such as some
    //  legacy SMTP servers).
    mime.Convert8Bit()

    fmt.Println("8bit/binary parts converted to base64.")
    mimeText := mime.GetMime()
    if mime.LastMethodSuccess() == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    fmt.Println(*mimeText)

    mime.DisposeMime()