Ruby

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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Ruby

require 'chilkat'

success = false

mime = Chilkat::CkMime.new()
success = mime.LoadMimeFile("qa_data/message.eml")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  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.
success = mime.ConvertToMultipartAlt()
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Add an alternative representation of the same content.
htmlPart = Chilkat::CkMime.new()
success = htmlPart.SetBodyFromHtml("<html><body>HTML alternative.</body></html>")
if (success == false)
    print htmlPart.lastErrorText() + "\n";
    exit
end

success = mime.AppendPart(htmlPart)
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

print "Number of parts: " + mime.get_NumParts().to_s() + "\n";