Pascal (Lazarus/Delphi)

TCP/IP Socket Connect to Remote Host:Port

See more Socket/SSL/TLS Examples

Demonstrates how to create a TCP/IP socket, connect to a remote host:port, and receive a "Hello World!" message. 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.Socket;

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

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  ssl: Boolean;
  maxWaitMillisec: Integer;
  receivedMsg: string;

begin
  success := False;

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

  socket := TSocket.Create;

  //  Connect to port 5555 of localhost.
  //  The string "localhost" is for testing on a single computer.
  //  It would typically be replaced with an IP hostname, such
  //  as "www.chilkatsoft.com".
  ssl := False;
  maxWaitMillisec := 20000;
  success := socket.Connect('localhost',5555,ssl,maxWaitMillisec);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Set maximum timeouts for reading an writing (in millisec)
  socket.MaxReadIdleMs := 10000;
  socket.MaxSendIdleMs := 10000;

  //  Pretend, for the sake of the example, that the
  //  ficticious server is going to send a "Hello World!" 
  //  after accepting the connection.  
  //  Note: Technically, the ReceiveString may not receive the
  //  complete string, although it's highly probable given the short
  //  length of the "Hello World!" message. 
  //  See this Chilkat blog post for more information:
  //  <a href="http://www.cknotes.com/?p=302">http://www.cknotes.com/?p=302</a>
  receivedMsg := socket.ReceiveString();
  if (socket.LastMethodSuccess <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Close the connection with the server
  //  Wait a max of 20 seconds (20000 millsec)
  success := socket.Close(20000);

  WriteLn(receivedMsg);


  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.