Lianja

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, 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: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

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llSuccess = .F.

loMime = createobject("CkMime")
llSuccess = loMime.LoadMimeFile("qa_data/message.eml")
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    return
endif

//  Wrap the current entity in a new outer multipart/alternative entity.  The original entity
//  becomes the first child, ready for an alternate representation to be added.
llSuccess = loMime.ConvertToMultipartAlt()
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    return
endif

//  Add an alternative representation of the same content.
loHtmlPart = createobject("CkMime")
llSuccess = loHtmlPart.SetBodyFromHtml("<html><body>HTML alternative.</body></html>")
if (llSuccess = .F.) then
    ? loHtmlPart.LastErrorText
    release loMime
    release loHtmlPart
    return
endif

llSuccess = loMime.AppendPart(loHtmlPart)
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loHtmlPart
    return
endif

? "Number of parts: " + str(loMime.NumParts)


release loMime
release loHtmlPart