The difference between QT exec and show

To clarify the difference between the two functions , You also need to understand window mode ：

modal window ： The window will block in place , Only this window can be operated , Other windows can no longer be operated ; Only after closing the window , The return value will be obtained at the code , Block to stop , You can operate other interfaces ;
Half mode window ： The window will be blocked in place , Although you can only operate this window , Other windows can no longer be operated , But the code will continue to run , So it's pseudo blocking ;
Non modal window ： Windows will not block , It can be operated at will ;
3、 ... and 、exec() and show() The difference between
function effect
QDialog* Dlg = new QDialog(this); Dlg->exec(); modal window
QDialog* Dlg = new QDialog(this); Dlg->setModal(true); Dlg->show(); Half mode window
QDialog* Dlg = new QDialog(this); Dlg->show(); Non modal window

void MainWindow::on_tBtn_Alarm_clicked()
{
    
    AlarmConfigDlg *alarmConfigDlg =new AlarmConfigDlg(this);
    alarmConfigDlg->show();
}

void MainWindow::on_tBtn_Alarm_clicked()
{
    
    AlarmConfigDlg alarmConfigDlg(this);
    alarmConfigDlg.exec();
}