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Count the Messages in a multipart/digest Email

Demonstrates the read-only Chilkat Email.NumDigests property, which is the number of message/rfc822 parts contained within a multipart/digest enclosure. If no such enclosure exists, the value is 0. Digest indexes are zero-based; use GetDigestEmail to retrieve an individual bundled message as its own Email object. This example loads a digest email and lists each message's subject.

Background: A multipart/digest is a way to package many separate emails inside one carrier message — historically used by mailing lists to send a single daily "digest" containing all of that day's posts. Each bundled item is a complete message/rfc822 email with its own headers and body. This differs from NumAttachedMessages, which counts nested messages attached to an ordinary email rather than the members of a digest enclosure.

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Local $bSuccess = False

;  Demonstrates the read-only Email.NumDigests property, which is the number of
;  message/rfc822 parts contained within a multipart/digest enclosure.  If there is no
;  multipart/digest enclosure, the value is 0.  Digest indexes are zero-based.

$oEmail = ObjCreate("Chilkat.Email")

;  Load a multipart/digest email (a single email that bundles many messages).
$bSuccess = $oEmail.LoadEml("qa_data/eml/digest.eml")
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

Local $iN = $oEmail.NumDigests
ConsoleWrite("NumDigests = " & $iN & @CRLF)

;  Retrieve each bundled message as its own Email object.
$oDigestEmail = ObjCreate("Chilkat.Email")
Local $i
For $i = 0 To $iN - 1
    $bSuccess = $oEmail.GetDigestEmail($i,$oDigestEmail)
    ConsoleWrite("Digest " & $i & " subject: " & $oDigestEmail.Subject & @CRLF)
Next

;  Note: Paths such as "qa_data/..." are relative local filesystem paths,
;  relative to the current working directory of the running application.