Pascal (Lazarus/Delphi)

Fetch the UIDLs of All POP3 Messages

Demonstrates the Chilkat MailMan.FetchUidls method, which retrieves the UIDLs of the messages currently in the POP3 mailbox and stores them in a StringTable, one entry per message, in the server's current mailbox order. This example lists every UIDL.

Background: The UIDL list is the starting point for incremental mail retrieval. A client keeps a record of the UIDLs it has already downloaded; on each check it fetches the current list, computes the difference, and downloads only the new ones (see FetchUidlSet). This is how "leave a copy on the server" works without repeatedly re-downloading the same messages.

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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;
  n: Integer;
  i: Integer;

begin
  success := False;

  //  Demonstrates the MailMan.FetchUidls method, which retrieves the UIDLs of the messages
  //  currently in the POP3 mailbox and stores them in a StringTable, one entry per message, in
  //  the server's current mailbox order.

  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';

  //  Retrieve the UIDLs of all messages in the mailbox.
  uidls := TStringTable.Create;

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

  n := uidls.Count;
  WriteLn('Mailbox contains ' + n + ' messages.');

  for i := 0 to n - 1 do
    begin
      WriteLn('UIDL ' + i + ': ' + uidls.StringAt(i));
    end;

  //  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.