Create a method for a custom type for QML created by QT c++

[carles.sole.grau]

Hi everybody,
I'm trying to add a new custom type to the QML.
Everything works fine except I don't know how to add its own functions to the new type created:

My .h file is:

#ifndef SERIALCOMMUNICATION_H
#define SERIALCOMMUNICATION_H

#include <QObject>
#include <QSerialPort>
#include <QByteArray>
#include <QtQuick>

class SerialCommunicationtoQML: public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
    Q_PROPERTY(int numAvailablePorts READ numAvailablePorts WRITE setnumAvailablePorts NOTIFY numAvailablePortsChanged)    

public:

    SerialCommunicationtoQML(QQuickItem *parent = 0);

    QString name() const;
    void setName(const QString &name);

    int numAvailablePorts() const;
    void setnumAvailablePorts(const int &numAvailablePorts);

    void getPortInfo();

signals:

    void nameChanged();
    void numAvailablePortsChanged();

private:

    QString m_name;
    int m_numAvailablePorts;

};

#endif // SERIALCOMMUNICATION_H

Then my .cpp file is:

#include "serialcommunication.h"


SerialCommunicationtoQML::SerialCommunicationtoQML(QQuickItem *parent)    : QObject(parent)
{
    //Aquí podem inicialitzar les variables amb el seu valor per defecte
    m_numAvailablePorts = 0;
}

QString SerialCommunicationtoQML::name() const
{
    return m_name;
}

void SerialCommunicationtoQML::setName(const QString &name)
{
    if (name != m_name) {
        m_name = name;
        emit nameChanged();
    }
}

int SerialCommunicationtoQML::numAvailablePorts() const
{
    return m_numAvailablePorts;
}

void SerialCommunicationtoQML::setnumAvailablePorts(const int &numAvailablePorts)
{
    if (numAvailablePorts != m_numAvailablePorts) {
        m_numAvailablePorts = numAvailablePorts;
        emit numAvailablePortsChanged();
    }
}

void SerialCommunicationtoQML::getPortInfo()
{
    
}

And finally my .qml file (for testing ) is:

import QtQuick 2.4
import QtQuick.Window 2.2
import SerialCommunication.toQML 1.0


Window {
    visible: true    
    height: 700
    width: 700

    Rectangle {
        color: "lightblue"
        anchors.centerIn: parent
        width: parent.width/2
        height: parent.width/2

        Text {
            anchors.centerIn: parent
            text:"El nom és " + serial.name + "\nNúm de ports disponibles: " + serial.numAvailablePorts
        }

        SerialCommunication {
            id: serial
            name: "INITIAL NAME"
            
        }

    }
    MouseArea{
        anchors.fill: parent
        onClicked: {
            console.log("CLICKED ")
            serial.getPortInfo()
        }

    }
}

So when I press the mouse area, I expect to go to the getPortInfo function but:

qrc:/main.qml:33: TypeError: Property 'getPortInfo' of object SerialCommunicationtoQML(0x16c5da0) is not a function

Thank you!

[A Former User]

Hi! The functions that shall be callable from QtQuick must be declared as either slot or invokable, e.g.:

public: 
Q_INVOKABLE void getPortInfo();

[carles.sole.grau]

Thank you very much @Wieland ,
Now it's working!