unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ScktComp, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Memo1: TMemo;
    port: TEdit;
    ClientSocket1: TClientSocket;
    ServerSocket1: TServerSocket;
    procedure Button2Click(Sender: TObject);
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerSocket1ClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerSocket1ClientWrite(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button2Click(Sender: TObject);
begin
memo1.lines.add('Connecting');
serversocket1.port:=strtoint(port.text);
memo1.lines.add('serversocket port');
clientsocket1.port:=strtoint(port.text);
memo1.lines.add('clientsocket port');
clientsocket1.host:='127.0.0.1';
memo1.lines.add('Clientsocket address');
clientsocket1.active:=true;
memo1.lines.add('Clientsocket active');
serversocket1.active:=true;
memo1.lines.add('Serversocket active');
memo1.lines.add('All connected, standing by');
end;

procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
memo1.lines.add('Clientsocket has connected successfully');
end;

procedure TForm1.ServerSocket1ClientConnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
memo1.lines.add('Serversocket has detected a connection');
end;

procedure TForm1.ServerSocket1ClientWrite(Sender: TObject;
  Socket: TCustomWinSocket);
begin
memo1.lines.add('Client has sent a message');
memo1.lines.add('message is: "'+socket.ReceiveText+'".');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if clientsocket1.active=true then
begin
    memo1.lines.add('sending message');
    clientsocket1.Socket.SendText('Haha');
end
else
    memo1.lines.add('First connect all');
end;

end.