Ruby

Add a Related String Resource to an Email

Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

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Ruby

require 'chilkat'

#  Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
#  (such as a style sheet) from an in-memory string and returns the generated Content-ID.
#  The first argument is the resource name, the second is the text content, the third is the charset.

email = Chilkat::CkEmail.new()
email.put_Subject("Email with a related style sheet")

#  Add the text-based related resource first; capture the generated Content-ID.
cid = email.addRelatedString("styles.css","body { color: navy; }","utf-8")
if (email.get_LastMethodSuccess() == false)
    print email.lastErrorText() + "\n";
    exit
end

#  Build the HTML body, referencing the related style sheet by its Content-ID.  A
#  placeholder is used and then replaced with the actual Content-ID.
sbHtml = Chilkat::CkStringBuilder.new()
sbHtml.Append("<html><head><link rel=\"stylesheet\" href=\"cid:PLACEHOLDER_CID\"/></head><body>Styled content.</body></html>")
numReplaced = sbHtml.Replace("PLACEHOLDER_CID",cid)
email.SetHtmlBody(sbHtml.getAsString())

print "Related Content-ID = " + cid + "\n";
print "NumRelatedItems = " + email.get_NumRelatedItems().to_s() + "\n";