int Ping(){
  String ret;  // <-- Added this line
  String cmdline = "ping -n 3 192.168.0.1";
  One<SlaveProcess> sp = StartProcess(cmdline);
  while(sp->IsRunning()){
    Sleep(200);
    sp->Read(ret); // <-- Added this line
  }
  return sp->GetExitCode();
}