Delphi ActiveX

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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var
success: Integer;
email: TChilkatEmail;
n: Integer;
digestEmail: TChilkatEmail;
i: Integer;

begin
success := 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.

email := TChilkatEmail.Create(Self);

//  Load a multipart/digest email (a single email that bundles many messages).
success := email.LoadEml('qa_data/eml/digest.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

n := email.NumDigests;
Memo1.Lines.Add('NumDigests = ' + IntToStr(n));

//  Retrieve each bundled message as its own Email object.
digestEmail := TChilkatEmail.Create(Self);

for i := 0 to n - 1 do
  begin
    success := email.GetDigestEmail(i,digestEmail.ControlInterface);
    Memo1.Lines.Add('Digest ' + IntToStr(i) + ' subject: ' + digestEmail.Subject);
  end;

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