如何从cpp文件中发出信号并在QML文件中接收？

#include <QObject>

class MyObject : public QObject
{
    Q_OBJECT
public:
    explicit MyObject(QObject *parent = nullptr);

signals:
    void mySignal();
};

#include "myobject.h"

MyObject::MyObject(QObject *parent) : QObject(parent)
{
    // 在合适的时机调用信号
    emit mySignal();
}

import QtQuick 2.0

Item {
    id: root

    // 导入MyObject类
    import com.example 1.0

    // 创建MyObject实例
    MyObject {
        id: myObject
    }

    // 接收信号并执行相应操作
    Connections {
        target: myObject
        onMySignal: {
            // 在此处处理信号
        }
    }
}

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "myobject.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    // 注册MyObject类
    qmlRegisterType<MyObject>("com.example", 1, 0, "MyObject");

    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}