How I can connect circularGauge qml with signal in cpp

[A Former User]

my code in QML:

import QtQuick 2.6
import QtQuick.Controls 2.1
import QtQuick.Extras 1.4
import QtQuick.Controls.Styles 1.4

Rectangle{

    width:300
    height: 300
    //property alias CircularGauge:circularGauge
    function setvalue(value){ circularGauge.value = value; }



  CircularGauge{

      id: circularGauge
      anchors.centerIn: parent
             minimumValue : -30
             maximumValue : 30
             style: CircularGaugeStyle
             {
                 minimumValueAngle : -90
                 maximumValueAngle  : 90

                 needle:Item
                 {
     //                Rectangle
     //                {
     //                    width: outerRadius * 0.02
     //                    height: outerRadius * 0.7
     //                    color: "Light Blue"
     //                }
                 }
                 foreground: Item
                 {
     //                Rectangle {
     //                    width: outerRadius * 0.2
     //                    height: width
     //                    radius: width / 2
     //                    color: "#e5e5e5"
     //                    anchors.centerIn: parent
     //                }
                 }

                 tickmarkLabel:Text
                 {
                     color:"Black"
                     text : styleData.value
                 }
             }
         }





  }

//MY CODE IN mainWindow cpp:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtQml>


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ui->qml->setSource(QUrl("qrc:///uil.qml"));
    ui->qml->show();
   
    auto rootObject = ui->qml->rootObject();
    connect(this,SIGNAL(setGauge(QVariant)),rootObject,SLOT(setvalue(QVariant)));


}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_dial_sliderMoved(int position)
{
    emit setGauge(15.5);
}

15.5 is an example of a number..Can you help me?

[A Former User]

@vale88 I solved