QWidget *currentWidget = nullptr;
    QListWidgetItem *currentItem = nullptr;
    QFont fontWidget;
    int numItem;

    numItem = listWidgetMain->currentRow();

    if ((numItem >= 0) && (numItem < listWidgetMain->count()))
    {
        currentItem = new QListWidgetItem();
        currentWidget = new QWidget();
        // The item is correctly selected
        currentItem = listWidgetMain->item(numItem);
        // The problem is here: the widget is not returned
        currentWidget = listWidgetMain->itemWidget(currentItem);
        fontWidget = currentWidget->font();
    }

The "currentItem" is ok, whereas the "currentWidget" is empty after the call to "itemWidget", and I don't understand why...
Could someone explain me:

• Why it does not work
• How to get the Widget address

The complete code is:

• mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QListWidget>
#include <QVBoxLayout>
#include <QPushButton>
#include <QWidget>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

public slots:
    void Test();

private:
    QWidget *centralWidget;
    QListWidget *listWidgetMain;
    QVBoxLayout *vertLayoutMain;
    QPushButton *BT_test;
};
#endif // MAINWINDOW_H

• mainwindow.cpp:

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    int numLine;

    // QListWidget object
    listWidgetMain = new QListWidget();
    for (numLine = 0; numLine < 5; numLine++)
    {
        listWidgetMain->addItem("text_" + QString::number(numLine + 1));
    }

    // Test button
    BT_test = new QPushButton("Test");
    QObject::connect(BT_test, SIGNAL(clicked()), this, SLOT(Test()));

    // Layout with the list built
    vertLayoutMain = new QVBoxLayout();
    vertLayoutMain->addWidget(listWidgetMain);
    vertLayoutMain->addWidget(BT_test);

    // Main widget
    centralWidget = new QWidget();
    setCentralWidget(centralWidget);
    centralWidget->setLayout(vertLayoutMain);
}

MainWindow::~MainWindow()
{
}

void MainWindow::Test()
{
    QWidget *currentWidget = nullptr;
    QListWidgetItem *currentItem = nullptr;
    QFont fontWidget;
    int numItem;

    numItem = listWidgetMain->currentRow();

    if ((numItem >= 0) && (numItem < listWidgetMain->count()))
    {
        currentItem = new QListWidgetItem();
        currentWidget = new QWidget();
        // The item is correctly selected
        currentItem = listWidgetMain->item(numItem);
        // The problem is here: the widget is not returned
        currentWidget = listWidgetMain->itemWidget(currentItem);
        fontWidget = currentWidget->font();
    }
}

Thank you in advance for your help!
Laurent