Attach a File to a Multipart MIME Entity

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Demonstrates the Chilkat Mime.AppendPartFromFile method, which reads a local file, creates an attachment part, and appends it. The only argument is the file path; the content headers are chosen from the filename extension.

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 the one-call way to add an attachment: Chilkat reads the file, infers its Content-Type from the extension, base64-encodes binary content, and appends it as a child part — typically inside a multipart/mixed. It is the building block behind adding attachments to an email, saving you from constructing the part and setting its headers by hand.

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    success := false

    //  Demonstrates the Mime.AppendPartFromFile method, which reads a local file, creates an attachment
    //  part, and appends it.  The only argument is the file path; the content headers are chosen from
    //  the filename extension.

    mime := chilkat.NewMime()
    success = mime.NewMultipartMixed()
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  A message body part.
    bodyPart := chilkat.NewMime()
    success = bodyPart.SetBodyFromPlainText("Please see the attached files.")
    if success == false {
        fmt.Println(bodyPart.LastErrorText())
        mime.DisposeMime()
        bodyPart.DisposeMime()
        return
    }

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

    //  Attach files directly.
    success = mime.AppendPartFromFile("qa_data/report.pdf")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        bodyPart.DisposeMime()
        return
    }

    success = mime.AppendPartFromFile("qa_data/photo.jpg")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        bodyPart.DisposeMime()
        return
    }

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

    mime.DisposeMime()
    bodyPart.DisposeMime()