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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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;  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.

$oEmail = ObjCreate("Chilkat.Email")

;  Set an HTML body that references a related item by content-id.
$oEmail.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.
Local $sCid = $oEmail.AddRelatedString("logo.png","(pretend this is image data)","")
ConsoleWrite("Related content-id = " & $sCid & @CRLF)

ConsoleWrite("NumRelatedItems = " & $oEmail.NumRelatedItems & @CRLF)