Pascal (Lazarus/Delphi)

POP3 using HTTP Proxy

Demonstrates how to communicate with a POP3 server through an HTTP proxy. 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.EmailBundle,
  Chilkat.Email;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  bundle: TEmailBundle;
  keepOnServer: Boolean;
  headersOnly: Boolean;
  numBodyLines: Integer;
  email: TEmail;
  i: Integer;

begin
  success := False;

  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  The mailman object is used for receiving (POP3) 
  //  and sending (SMTP) email.
  mailman := TMailMan.Create;

  //  To connect through an HTTP proxy, set the HttpProxyHostname
  //  and HttpProxyPort properties to the hostname (or IP address)
  //  and port of the HTTP proxy.  Typical port numbers used by
  //  HTTP proxy servers are 3128 and 8080.
  mailman.HttpProxyHostname := 'www.my-http-proxy.com';
  mailman.HttpProxyPort := 3128;

  //  Important:  Your HTTP proxy server must allow non-HTTP
  //  traffic to pass.  Otherwise this does not work.

  //  Set the POP3 server's hostname
  mailman.MailHost := 'pop.example.com';

  //  Set the POP3 login/password.
  mailman.PopUsername := 'myLogin';
  mailman.PopPassword := 'myPassword';

  //  Copy the all email from the user's POP3 mailbox 
  //  into a bundle object.  The email remains on the server.
  //  
  //  NOTE: All methods that communicate with a POP3 server
  //  will automatically connect and authenticate (i.e. login)
  //  if not already connected.  The connection will remain
  //  open after the method call returns so that subsequent
  //  calls do not need to re-establish the connection.
  //  In this case, the connection is established via the HTTP
  //  proxy.
  bundle := TEmailBundle.Create;
  keepOnServer := True;
  headersOnly := False;
  //  Irrelevent because we are not downloading headers-only
  numBodyLines := 0;
  success := mailman.FetchAll(keepOnServer,headersOnly,numBodyLines,bundle);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  email := TEmail.Create;
  i := 0;
  while i < bundle.MessageCount do
    begin
      bundle.EmailAt(i,email);

      WriteLn('From: ' + email.From);
      WriteLn('Subject: ' + email.Subject);
      i := i + 1;
    end;

  success := mailman.Pop3EndSession();


  mailman.Free;
  bundle.Free;
  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.