Mine

procedure tform1.cread(Sender: TObject; Socket: TCustomWinSocket);
var buf:array[0..4096] of char;
    fs:tmemorystream;
    s:String;
    i:integer;
begin
  windows.beep(500,30);
  if not b then
  begin
    s:=socket.ReceiveText;
    if s[1]='c' then
      memo1.lines.add('command: '+s);
    if s[1]='d' then
    begin
      delete(s,1,1);
      nsize:=strtoint(s);
      memo1.lines.add('data size: '+inttostr(nsize));
      b:=true;
      fs:=tmemorystream.Create;
      cnt:=0;
      fs.position:=0;
      end;
  end
  else
  begin
    i:=socket.ReceiveBuf(buf, sizeof(buf));
    inc(cnt, i);
    fs.WriteBuffer(buf, i);
    memo1.lines.add(inttostr(cnt));
    if cnt>=nsize then
    begin
      memo1.lines.add('data read!');
      fs.SaveToFile('c:\desktop\this.jpg');
      b:=false;
    end;
  end;
end;