Classic ASP

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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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  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.

set email = Server.CreateObject("Chilkat.Email")

'  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.
cid = email.AddRelatedString("logo.png","(pretend this is image data)","")
Response.Write "<pre>" & Server.HTMLEncode( "Related content-id = " & cid) & "</pre>"

Response.Write "<pre>" & Server.HTMLEncode( "NumRelatedItems = " & email.NumRelatedItems) & "</pre>"

%>
</body>
</html>