22     wifi = nullptr;  in MainWindow()
57     QListWidgetItem *wifi = new QListWidgetItem(tr("WiFi"), &listWidget);  in MainWindow()  local
58     wifi->setFont(font);  in MainWindow()
94 QString MainWindow::saveConfig(int volume, int wifi, int bt)  in saveConfig()  argument
111     out << "isWifiOn = " + QString::number(wifi) << endl;  in saveConfig()
165     } else if(! item->text().compare("WiFi")){  in on_itemClicked()
166         wifi = qtWifi::getInstance(this, &subTitle, &toggleBtn, isWifiOn);  in on_itemClicked()
167         stack.addWidget(wifi);  in on_itemClicked()
168         stack.setCurrentIndex(stack.indexOf(wifi));  in on_itemClicked()
200         }else if(wifi){  in on_returnClicked()
201             stack.removeWidget(wifi);  in on_returnClicked()
202             isWifiOn = wifi->isOn();  in on_returnClicked()
203             delete wifi;  in on_returnClicked()
204             wifi = nullptr;  in on_returnClicked()