// а форме ServerSocket1, ClientSocket1 : (Active := False,
// Host := localhost, Port := 2001, xType := xNonBlocking),
// OpenDialog1, Button1, Memo1.

procedure TfmMain.FormCreate(Sender: TObject);
begin
 ServerSocket1.Active:=true;
 ClientSocket1.Active:=true;
end;

{--- Server ---}

procedure TfmMain.Button1Click(Sender: TObject);
var
 sStream : TMemoryStream;
begin
 sStream := TMemoryStream.Create;
 if not OpenDialog1.Execute then
 Exit;
 sStream.LoadFromFile(OpenDialog1.FileName);
 ServerSocket1.Socket.Connections[0].SendStreamThenDrop(sStream);
end;

{--- Client ---}

const
 MAX_BUF_SIZE = $4095;

var
 fStream: TFileStream;

{OnConnect}
procedure TfmMain.ClientSocket1Connect(Sender: TObject;
 Socket: TCustomWinSocket);
begin
 fStream:= TFileStream.Create('Receive.fil', fmCreate);
end;

{OnRead}
procedure TfmMain.ClientSocket1Read(Sender: TObject;
 Socket: TCustomWinSocket);
var
 count :Integer;
 buffer: Array [0..MAX_BUF_SIZE] of Char;
begin
 repeat
 Socket.Lock;
 count:= Socket.ReceiveBuf(buffer,SizeOf(buffer));
 if count > 0 then
 fStream.WriteBuffer(buffer,count);
 Socket.Unlock;
 until (count <= 0);

 Memo1.Lines.Add(IntToStr(fStream.Size));
end;

{OnDisconnect}
procedure TfmMain.ClientSocket1Disconnect(Sender: TObject;
 Socket: TCustomWinSocket);
begin
 fStream.Free;
end;