// 创建模态对话框阻塞整个应用程序和非模态对话框唯一性约束
    QMenu *pDialog = mBar->addMenu(QString::fromLocal8Bit("对话框"));
    QAction *pTopDialog = pDialog->addAction(QString::fromLocal8Bit("模态对话框"));
    connect(pTopDialog, &QAction::triggered,
        [this] () mutable {
            QDialog * pdlg1 = nullptr;
            pdlg1 = new QDialog(this);
            pdlg1->setWindowTitle(QString::fromLocal8Bit("模态对话框"));
            pdlg1->setModal(true);
            pdlg1->setAttribute(Qt::WidgetAttribute::WA_DeleteOnClose);
            pdlg1->show();
            qDebug() << QString::fromLocal8Bit("打开模态对话框").toStdString().c_str() << "dialog addr: " << (void *)pdlg1 << (void *)&pdlg1;
        });
    pDialog->addSeparator();
    static QPointer<QDialog> pp = nullptr; // 确保对话框的唯一性的QT智能保护指针
    QAction *pNTopDialog = pDialog->addAction(QString::fromLocal8Bit("非模态对话框"));
    connect(pNTopDialog, &QAction::triggered,
        [this] () mutable {
            QDialog * pdlg2 = nullptr;
            if ( pp.isNull() )
            {
                pdlg2 = new QDialog(this);
                pp = pdlg2; // 保存当前对话框的QObject对象的地址
                pdlg2->setWindowTitle(QString::fromLocal8Bit("非模态对话框"));
                pdlg2->setModal(false);
                pdlg2->setAttribute(Qt::WidgetAttribute::WA_DeleteOnClose);
                pdlg2->show();
                qDebug() << QString::fromLocal8Bit("打开非模态对话框").toStdString().c_str() << "dialog addr: " << (void *)pdlg2 << (void *)&pdlg2;
            }
            else
            {
                pdlg2 = pp.data(); // 获得当前对话框的QObject对象的地址
                qDebug() << QString::fromLocal8Bit("当前对话框已经打开").toStdString().c_str() << "dialog addr: " << (void *)pdlg2 << (void *)&pdlg2;
            }
    });

QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+481+302 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+481+302 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+481+302 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+481+302 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
打开模态对话框 dialog addr:  0x4b78b0 0x22c298

QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+782+289 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+782+289 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+782+289 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+782+289 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
打开非模态对话框 dialog addr:  0x415ea8 0x22c27c
当前对话框已经打开 dialog addr:  0x415ea8 0x22c27c
当前对话框已经打开 dialog addr:  0x415ea8 0x22c27c
QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+782+289 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+782+289 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
QWindowsWindow::setGeometryDp: Unable to set geometry 100x30+782+289 on QWidgetWindow/‘QDialogClassWindow‘. Resulting geometry:  116x30+782+289 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).
打开非模态对话框 dialog addr:  0x4847f0 0x22c27c
当前对话框已经打开 dialog addr:  0x4847f0 0x22c27c
当前对话框已经打开 dialog addr:  0x4847f0 0x22c27c