Perl

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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Perl

use 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() == 0) {
    print $email->lastErrorText() . "\r\n";
    exit;
}

#  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 . "\r\n";
print "NumRelatedItems = " . $email->get_NumRelatedItems() . "\r\n";