Perl

Get the Content-ID of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentID method, which returns the Content-ID of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object, adds it as a related item with AddRelatedBd (capturing the generated Content-ID and referencing it from the HTML), then reads that Content-ID back.

Background: The Content-ID is the anchor that ties an inline resource to the HTML that displays it: the body references cid: plus the ID, and the matching related part carries that same Content-ID. Because an image is binary, it is loaded into a BinData object (here from a file) and added with AddRelatedBd. Reading the Content-ID back lets a program verify or rewrite those links — for example when relocating embedded images or converting a message for display outside a mail client.

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Perl

use chilkat();

$success = 0;

#  Demonstrates the GetRelatedContentID method, which returns the Content-ID of a related
#  item.  Related items are typically images and style sheets embedded within HTML emails.
#  The index is zero-based.

$email = chilkat::CkEmail->new();
$email->put_Subject("GetRelatedContentID example");

#  Load the image data from a file into a BinData object.
$bdImage = chilkat::CkBinData->new();
$success = $bdImage->LoadFile("qa_data/images/logo.png");
if ($success == 0) {
    print $bdImage->lastErrorText() . "\r\n";
    exit;
}

#  Add the image as a related item from the BinData; capture its generated Content-ID.
$cid = $email->addRelatedBd("logo.png",$bdImage);
if ($email->get_LastMethodSuccess() == 0) {
    print $email->lastErrorText() . "\r\n";
    exit;
}

#  Reference the related item in the HTML body by its Content-ID.
$sbHtml = chilkat::CkStringBuilder->new();
$sbHtml->Append("<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
$numReplaced = $sbHtml->Replace("PLACEHOLDER_CID",$cid);
$email->SetHtmlBody($sbHtml->getAsString());

#  Read the Content-ID of the first related item (index 0).
$cid0 = $email->getRelatedContentID(0);
print "Related item 0 Content-ID: " . $cid0 . "\r\n";

#  Note: The path "qa_data/images/logo.png" is a relative local filesystem path,
#  relative to the current working directory of the running application.