Pascal (Lazarus/Delphi)

Delete a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.DeleteUidlSet method, which marks the POP3 messages whose UIDLs are listed in a StringTable for deletion. Chilkat processes the UIDL set and sends a DELE command for each located message. This example deletes two messages by UIDL.

Background: When you already know exactly which messages to remove — by their stable UIDLs — DeleteUidlSet deletes them all in one call without first downloading them. It is the efficient counterpart to fetching-then-deleting: for example, after processing messages elsewhere, hand back just their UIDLs to clear them. The deletions are committed when the POP3 session ends (unless ImmediateDelete is set).

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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.MailMan,
  Chilkat.StringTable;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  uidls: TStringTable;

begin
  success := False;

  //  Demonstrates the MailMan.DeleteUidlSet method, which marks the POP3 messages whose UIDLs
  //  are listed in a StringTable for deletion.  Chilkat sends DELE for each located message.

  mailman := TMailMan.Create;

  //  Configure the POP3 server connection.
  mailman.MailHost := 'pop.example.com';
  mailman.MailPort := 995;
  mailman.PopSsl := True;
  mailman.PopUsername := 'user@example.com';
  mailman.PopPassword := 'myPassword';

  //  Build the set of UIDLs to delete.
  uidls := TStringTable.Create;
  uidls.Append('0000000123abcdef');
  uidls.Append('0000000124abcdef');

  //  Mark the messages for deletion.

  success := mailman.DeleteUidlSet(uidls);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Unless the ImmediateDelete property is set to True, the messages are only marked for
  //  deletion.  End the POP3 session (which sends the QUIT command) to commit the deletions.
  success := mailman.Pop3EndSession();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  WriteLn('Deleted the UIDL set from the POP3 server.');

  //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
  //  connects and authenticates -- using the property settings above -- whenever a server
  //  operation requires it.  Calling the explicit connect/authenticate methods can still be
  //  helpful to determine whether a failure occurs while connecting or while authenticating.


  mailman.Free;
  uidls.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.