Pascal (Lazarus/Delphi)

Check the Number of Messages in a POP3 Mailbox

Demonstrates the Chilkat MailMan.CheckMail method, which returns the number of messages currently available in the POP3 mailbox, or -1 if an error occurs. If no POP3 session is active, Chilkat connects and authenticates automatically using the configured settings. This example configures the POP3 connection and checks the message count.

Background: POP3 (Post Office Protocol version 3) is the classic protocol for downloading mail from a server to a client. A client connects, authenticates with a username and password, and can then list, retrieve, or delete messages. Modern connections use implicit TLS on port 995 (PopSsl = true). CheckMail is a quick way to ask "how many messages are waiting?" without downloading any of them.

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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;

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

procedure RunDemo;
var
  mailman: TMailMan;
  numMessages: Integer;

begin
  //  Demonstrates the MailMan.CheckMail method, which returns the number of messages currently
  //  available in the POP3 mailbox (or -1 if an error occurs).  If no POP3 session is active,
  //  Chilkat connects and authenticates automatically using the configured settings.

  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';

  //  Check the mailbox.  A return value of -1 indicates an error.
  numMessages := mailman.CheckMail();
  WriteLn('Number of messages in the mailbox: ' + numMessages);

  //  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;

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.