Create a multipart/related MIME Entity

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Demonstrates the Chilkat Mime.NewMultipartRelated method, which initializes the object as an empty multipart/related entity. It takes no arguments; the primary part and its related resources are then appended.

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: multipart/related ties a primary part to the resources it references — most commonly an HTML body and the inline images it embeds via cid: references. Unlike a plain attachment, a related image is displayed within the message rather than listed separately. The HTML part comes first, followed by each referenced resource with a matching Content-ID.

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    success := false

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

    mime := chilkat.NewMime()

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

    //  multipart/related groups a primary part with the resources it references, such as an HTML body
    //  and the inline images it displays.
    htmlPart := chilkat.NewMime()
    success = htmlPart.SetBodyFromHtml("<html><body><img src=\"cid:logo\"></body></html>")
    if success == false {
        fmt.Println(htmlPart.LastErrorText())
        mime.DisposeMime()
        htmlPart.DisposeMime()
        return
    }

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

    success = mime.AppendPartFromFile("qa_data/logo.png")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        htmlPart.DisposeMime()
        return
    }

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

    mime.DisposeMime()
    htmlPart.DisposeMime()