Connect a TCP or TLS Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.Connect, which establishes a TCP connection to a host and port. Setting the TLS argument to _TRUE_ performs a TLS handshake after the TCP connection succeeds.

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.Socket;

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

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  bTls: Boolean;
  maxWaitMs: Integer;

begin
  success := False;

  socket := TSocket.Create;

  //  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
  //  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
  bTls := True;
  maxWaitMs := 5000;
  success := socket.Connect('example.com',5000,bTls,maxWaitMs);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  StringCharset controls the character encoding used when sending and receiving text.
  socket.StringCharset := 'utf-8';

  //  The socket is now connected and ready to send and receive data using whatever protocol the
  //  application implements.
  WriteLn('Connected: ' + socket.IsConnected);

  //  Close the connection when finished.  The argument is the maximum time to wait for a clean
  //  shutdown, in milliseconds.
  success := socket.Close(1000);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;


  socket.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.