Add to start up with Qt

QString lightscreen = QDir::toNativeSeparators(qApp->applicationFilePath());

#ifdef Q_WS_WIN
  // Windows startup settings
  QSettings init("Microsoft", "Windows");
  init.beginGroup("CurrentVersion");
  init.beginGroup("Run");

  if (startup)
  {
    init.setValue("Lightscreen", lightscreen);
  }
  else
  {
    init.remove("Lightscreen");
  }

  init.endGroup();
  init.endGroup();
#endif