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unit Unit2;
//==========================================================================
   interface
//==========================================================================
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ScktComp;

type
  TForm1 = class(TForm)
    ServerSocket1: TServerSocket;
    ClientSocket1: TClientSocket;
    Button1: TButton;
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
    procedure ServerSocket1ClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure ClientSocket1Disconnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Button1Click(Sender: TObject);
  private
    FStream: TFileStream;
  public
  end;

var
  Form1: TForm1;
//==========================================================================
   implementation {$R *.dfm}
//==========================================================================
procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket); 
var 
  iLen: Integer; 
  Bfr: Pointer; 
begin 
  iLen := Socket.ReceiveLength; 
  GetMem(Bfr, iLen); 
  try 
    Socket.ReceiveBuf(Bfr^, iLen); 
    FStream.Write(Bfr^, iLen);
  finally
    FreeMem(Bfr); 
  end; 
end; 
//--------------------------------------------------------------------------
procedure TForm1.FormCreate(Sender: TObject); 
begin
  FStream := nil; 
end; 
//--------------------------------------------------------------------------
procedure TForm1.FormDestroy(Sender: TObject); 
begin 
  if Assigned(FStream) then 
  begin 
    FStream.Free; 
    FStream := nil; 
  end; 
end;
//--------------------------------------------------------------------------
procedure TForm1.ClientSocket1Disconnect(Sender: TObject; 
  Socket: TCustomWinSocket); 
begin 
  if Assigned(FStream) then 
  begin 
    FStream.Free; 
    FStream := nil; 
  end; 
end;
//--------------------------------------------------------------------------
procedure TForm1.ClientSocket1Connect(Sender: TObject; 
  Socket: TCustomWinSocket);
begin 
  FStream := TFileStream.Create('c:\atest.txt', fmCreate or fmShareDenyWrite);
end;
//--------------------------------------------------------------------------
procedure TForm1.ServerSocket1ClientConnect(Sender: TObject; 
  Socket: TCustomWinSocket);
begin
  Socket.SendStream(TFileStream.Create('c:\btest.txt', fmOpenRead or fmShareDenyWrite));
end;
//--------------------------------------------------------------------------
procedure TForm1.Button1Click(Sender: TObject);
begin 
  ServerSocket1.Active := True;
  ClientSocket1.Active := True;
end;

end.