c++ - 当从 C++ 发出的信号将数据发送到 QML

Question

我该怎么做:当信号完成回复时(来自 c++)发送变量 replydata(来自 c++)到 TextArea(qml)

我如何连接它？也许 Q_PROPERTY 是个好方法？我使用 Qt 5.3

    QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:///main.qml")));

SendGetSMS *Connection = new SendGetSMS();


engine.rootContext()->setContextProperty("abc1", Connection);

QObject::connect(Connection,&SendGetSMS::finishedReply,engine,...);

Answer 1

来自 the documentation

在 C++ 中:

class Message : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString author READ author WRITE setAuthor NOTIFY authorChanged)
public:
    void setAuthor(const QString &a) {
        if (a != m_author) {
            m_author = a;
            emit authorChanged();
        }
    }
    QString author() const {
        return m_author;
    }
private:
    QString m_author;
};

Message msg;
engine.rootContext()->setContextProperty("msg", &msg);

在 qml 中:

Text {
    width: 100; height: 100
    text: msg.author    // invokes Message::author() to get this value

    Component.onCompleted: {
        msg.author = "Jonah"  // invokes Message::setAuthor()
    }
}