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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 nSuccess
LOCAL oEmail
LOCAL n
LOCAL oDigestEmail
LOCAL i

nSuccess := 0

//  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 := CreateObject("Chilkat.Email")

//  Load a multipart/digest email (a single email that bundles many messages).
nSuccess := oEmail:LoadEml("qa_data/eml/digest.eml")
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    RETURN
ENDIF

n := oEmail:NumDigests
? "NumDigests = " + Str(n)

//  Retrieve each bundled message as its own Email object.
oDigestEmail := CreateObject("Chilkat.Email")

FOR i := 0 TO n - 1
    nSuccess := oEmail:GetDigestEmail(i, oDigestEmail)
    ? "Digest " + Str(i) + " subject: " + oDigestEmail:Subject
NEXT

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

oEmail:destroy()
oDigestEmail:destroy()