Qt QML accessing QML registered object in C++

Question

I have a class which derived QObject.

class SerialPortWidgetBackend : public QObject
{
Q_OBJECT

public:
SerialPortWidgetBackend();
QSerialPort *sp;
Q_INVOKABLE QStringList refreshPorts(void);
Q_INVOKABLE bool openPort(QString portName,QString baudRate);
Q_INVOKABLE bool closePort();
};

In QML file define object like this.

SerialPortWidgetBackend{
    id: backend
}

The QML file actually implements for search availible comports , cofigure it and open it. This works fine but i want access sp object. The qml registeration is below

qmlRegisterType<SerialPortWidgetBackend>("com.company.serialportwidgetbackend",1,0,"SerialPortWidgetBackend");

The registered object private. How can access it?

No it dont need. But i want open a comport. The SerialPortWidgetBackend class will used for another works. — Enes ÖZER
– Enes ÖZER, Commented Dec 11, 2020 at 13:51

Dharman · Accepted Answer · 2020-12-11 13:34:33Z

2

I think it's a bad practice to declare public attributes within your class. You can instead define properties with getters/setters which can be accessible from your qml file with the Q_PROPERTY Macro.

Please follow this link for more information: https://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html

edited Dec 11, 2020 at 13:34

Dharman♦

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answered Dec 11, 2020 at 13:29

Youssouf SISSOKO

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5 Comments

Amfasis Over a year ago

I'd suggest to add an example of the question with suggested Q_PROPERTY

Enes ÖZER Over a year ago

how will this answer help solve my problem?

Youssouf SISSOKO Over a year ago

Can you please read the documentation (i shared with you a link with all the explanation you need), i don't have it in mind..

Enes ÖZER Over a year ago

Thank you for your answer even if this doesn't work for me

scopchanov Over a year ago

It does not make sense to make a serial port property of a class.

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