Pascal (Lazarus/Delphi)

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Email;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  email: TEmail;
  n: Integer;
  i: Integer;

begin
  success := False;

  //  Demonstrates the read-only Email.NumReports property, which is the number of report
  //  parts in a multipart/report email (for example, a Delivery Status Notification).
  //  Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

  email := TEmail.Create;

  //  Load a multipart/report email (such as a bounce / DSN message).
  success := email.LoadEml('qa_data/eml/dsn_bounce.eml');
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  n := email.NumReports;
  WriteLn('NumReports = ' + n);

  for i := 0 to n - 1 do
    begin
      WriteLn('---- Report ' + i + ' ----');
      WriteLn(email.GetReport(i));
    end;



  email.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.