B4X

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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Dim success As Boolean = 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.

Dim email As ChilkatEmail
email.Initialize

'  Load a multipart/digest email (a single email that bundles many messages).
success = email.LoadEml("qa_data/eml/digest.eml")
If success = False Then
    Log(email.LastErrorText)
    Return
End If


Dim n As Int = email.NumDigests
Log("NumDigests = " & n)

'  Retrieve each bundled message as its own Email object.
Dim digestEmail As ChilkatEmail
digestEmail.Initialize
Dim i As Int
For i = 0 To n - 1
    success = email.GetDigestEmail(i, digestEmail)
    Log("Digest " & i & " subject: " & digestEmail.Subject)
Next

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