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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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Local $bSuccess = False

;  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.

$oEmail = ObjCreate("Chilkat.Email")
$oEmail.Subject = "GetRelatedContentID example"

;  Load the image data from a file into a BinData object.
$oBdImage = ObjCreate("Chilkat.BinData")
$bSuccess = $oBdImage.LoadFile("qa_data/images/logo.png")
If ($bSuccess = False) Then
    ConsoleWrite($oBdImage.LastErrorText & @CRLF)
    Exit
EndIf

;  Add the image as a related item from the BinData; capture its generated Content-ID.
Local $sCid = $oEmail.AddRelatedBd("logo.png",$oBdImage)
If ($oEmail.LastMethodSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Reference the related item in the HTML body by its Content-ID.
$oSbHtml = ObjCreate("Chilkat.StringBuilder")
$oSbHtml.Append("<html><body><img src=""cid:PLACEHOLDER_CID""/></body></html>")
Local $iNumReplaced = $oSbHtml.Replace("PLACEHOLDER_CID",$sCid)
$oEmail.SetHtmlBody $oSbHtml.GetAsString()

;  Read the Content-ID of the first related item (index 0).
Local $sCid0 = $oEmail.GetRelatedContentID(0)
ConsoleWrite("Related item 0 Content-ID: " & $sCid0 & @CRLF)

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