Perl

Count the Related Items in an Email

Demonstrates the read-only Chilkat Email.NumRelatedItems property, which is the number of related MIME items in the email. Related items are resources — such as images or style sheets — embedded with an HTML body in a multipart/related enclosure, and are commonly referenced by the HTML using a cid: URL or a Content-Location. Indexes are zero-based. This example sets an HTML body, adds a related item, and prints the count.

Background: When an HTML email shows an image that travels inside the message (rather than being downloaded from the web), the image is a "related item." The HTML references it with <img src="cid:logo.png">, and a matching part carries a Content-ID of logo.png. The whole bundle lives in a multipart/related enclosure. This is different from an attachment: related items are meant to be displayed as part of the body, not saved as separate files.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the read-only Email.NumRelatedItems property.  Related items are
# resources (such as images or style sheets) embedded alongside an HTML body in a
# multipart/related enclosure, typically referenced from the HTML by a cid: URL.

my $email = Chilkat2::Email->new;

# Set an HTML body that references a related item by content-id.
$email->SetHtmlBody('<html><body><img src="cid:logo.png"/></body></html>');

# Add the related item.  AddRelatedString returns the content-id assigned to it.
# The empty charset argument means no charset conversion is applied.
my $cid = $email->AddRelatedString('logo.png', '(pretend this is image data)', '');
print 'Related content-id = ', $cid, "\n";

print 'NumRelatedItems = ', $email->NumRelatedItems, "\n";