Ruby

Check if a MIME Part is HTML

Demonstrates the Chilkat Mime.IsHtml method, which returns whether the Content-Type is exactly text/html. It takes no arguments and applies to the current part.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Finding the HTML part is the common goal when rendering a message richly — it is the formatted version a mail client prefers. In a multipart/alternative you would locate it with this predicate and fall back to the plain-text part when it is absent.

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require 'chilkat'

success = false

#  Demonstrates the Mime.IsHtml method, which returns whether the Content-Type is text/html.  It takes no arguments and applies to the current
#  part.  This example iterates the parts of a multipart message and reports which ones match.

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

n = mime.get_NumParts()
part = Chilkat::CkMime.new()

for i in 0 .. n - 1
    success = mime.PartAt(i,part)
    if (success == false)
        print mime.lastErrorText() + "\n";
        exit
    end

    if (part.IsHtml())
        print "Part " + i.to_s() + " (" + part.contentType() + ") is HTML." + "\n";
    end

end