QML property binding is not getting refeshed with values set in C++

Mamatha

Hi All,
We are facing the issue in the QML integration with C++. The value set using set method in C++ is not being retrieved in QML. It always shows the wrong value. Please suggest how to retrieve the value in QML using property binding.

ODБOï

@Mamatha hi
Qt QML -CPP integration-overview

KroMignon

@Mamatha Hi @Mamatha, you have to give more information about the way you are updating the value on C++ side and how you access the value on QML side.

The standart/normal way to do is to define a property on C++ side, like this:

class MyObject: public QObject
{
    Q_OBJECT

    PROPERTY(QString myMessage GET getMyMessage NOTIFY myMessageChanged)

public
    MyObject(QObject *parent = 0): QObject(parent), m_myMessage(QString()) {}

    QString getMyMessage() const { return m_myMessage }
    void updateMessage(const QString &message)
    {
        if(message != m_myMessage)
        {
            m_myMessage = message;
            emit myMessageChanged(message);
        }
    }

public slots:

signals:
     void myMessageChanged(const QString &message);

private:
     QString m_myMessage;
};

Then on QML side, supposing you have exposed a variable called cppObject:

Label {
...
    text: cppObject.myMessage 
}

That's it!