如何在Qt窗口关闭时释放内存？

class MyWindow : public QWidget {
    Q_OBJECT

public:
    MyWindow() {
        // 构造函数中初始化窗口和资源
    }

private slots:
    void releaseMemory() {
        // 释放窗口中使用的资源
        myImage.reset();
        myPixmap.reset();
        myByteArray.reset();

        // 删除自定义的QObject对象
        delete myObject;

        // 最后删除窗口对象
        this->deleteLater();
    }

private:
    QImage myImage;
    QPixmap myPixmap;
    QByteArray myByteArray;
    QObject* myObject;
};

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

    MyWindow* window = new MyWindow();
    // 连接窗口关闭信号到槽函数
    QObject::connect(window, &QWidget::destroyed, window, &MyWindow::releaseMemory);

    window->show();

    return app.exec();
}