我的Qt5应用程序如何以编程方式知道正在运行哪些窗口和对话框？

#include <QApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QList<QWidget*> windows = app.topLevelWindows();
    foreach(QWidget* window, windows) {
        qDebug() << "Window Title:" << window->windowTitle();
        qDebug() << "Window Class:" << window->metaObject()->className();
    }

    return app.exec();
}

#include <QApplication>
#include <QDebug>
#include <QDialog>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QList<QWidget*> widgets = app.allWidgets();
    foreach(QWidget* widget, widgets) {
        if (qobject_cast<QDialog*>(widget)) {
            qDebug() << "Dialog Title:" << widget->windowTitle();
            qDebug() << "Dialog Class:" << widget->metaObject()->className();
        }
    }

    return app.exec();
}