Dialog::Dialog(QWidget *parent) : QDialog(parent), dialog_ui(new Ui::Dialog) { dialog_ui->setupUi(this); dialog_ui->usbStatus->setText("Status: USB port isn't established."); dialog_ui->connectUSB->setText("Connect to USB port."); dialog_ui->startPressurePlot->setText("Start Plotting"); dialog_ui->startPressurePlot->setDisabled(true); rtpUSB_is_available = false; rtpUSB_cancel_enable = false; connect(&pressure_time, SIGNAL(timeout()), this, SLOT(request_pressure_slot())); }