How to pass a 2 dimensional float array from QML to C++?

[TheIndependentAquarius]

I have a two dimensional float array in QML. How do I get its values in C++.

I have created a class in c++ and have done the part of qmlRegisterType. The class is now accessible in QML.

Please demonstrate with a small example.

This is what I have tried:

#ifndef TEST_H
#define TEST_H
 
#include <QObject>
#include <QQuickItem>
#include <iostream>
 
class Test: public QObject
{
private:
    Q_OBJECT
 
    Q_PROPERTY(QVariantList name READ name WRITE setName)
    QVariantList m_name;
 
public:
    QVariantList name() const
    {
        return m_name;
    }
 
public slots:
    void setName (QVariantList arg)
    {
        m_name = arg;
 
        QVector<QVariant> p =  m_name.toVector ();
        std::cout << p.first ().toInt ();
    }
};
 
#endif // TEST_H

#ifndef TEST_H
#define TEST_H

#include <QObject>
#include <QQuickItem>
#include <iostream>

class Test: public QObject
{
private:
    Q_OBJECT

    Q_PROPERTY(QVariantList name READ name WRITE setName)
    QVariantList m_name;

public:
    QVariantList name() const
    {
        return m_name;
    }

public slots:
    void setName (QVariantList arg)
    {
        m_name = arg;

        QVector<QVariant> p =  m_name.toVector ();
        std::cout << p.first ().toInt ();
    }
};

#endif // TEST_H

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The c++ part is giving me a segmentation fault.

QML:

import QtQuick 2.2
import QtQuick.Window 2.1
 
import AGVUI 1.0
 
Window {
    visible: true
    width: 360
    height: 360
 
    function createTwoDimensionalArray (twoDimArray, rows, cols)
    {
        /// Creates all lines.
        for (var i = 0; i < rows; i++)
        {
            /// Creates an empty line.
            twoDimArray.push ([]);
 
            /// Ads colunms to the empty line.
            twoDimArray [i].push (new Array (cols));
 
            for (var j = 0; j < cols; j++)
            {
                /// Default initialization to zero
                twoDimArray [i][j] = 0
            }
        }
 
        return twoDimArray
    }
 
    Test
    {
        Component.onCompleted:
        {
            var arr = []
            createTwoDimensionalArray (arr, 2, 2)
 
            setName(arr)
        }
    }
 
    MouseArea {
        anchors.fill: parent
        onClicked: {
            Qt.quit();
        }
    }
 
    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
}

import QtQuick 2.2
import QtQuick.Window 2.1

import AGVUI 1.0

Window {
    visible: true
    width: 360
    height: 360

    function createTwoDimensionalArray (twoDimArray, rows, cols)
    {
        /// Creates all lines.
        for (var i = 0; i < rows; i++)
        {
            /// Creates an empty line.
            twoDimArray.push ([]);

            /// Ads colunms to the empty line.
            twoDimArray [i].push (new Array (cols));

            for (var j = 0; j < cols; j++)
            {
                /// Default initialization to zero
                twoDimArray [i][j] = 0
            }
        }

        return twoDimArray
    }

    Test
    {
        Component.onCompleted:
        {
            var arr = []
            createTwoDimensionalArray (arr, 2, 2)

            setName(arr)
        }
    }

    MouseArea {
        anchors.fill: parent
        onClicked: {
            Qt.quit();
        }
    }

    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
}

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