How to extract data from QFormLayout?

[szisziszilvi]

Hi,

I would like to use QFormLayout for a typical form-like widget and my problem is that I don't know to extract any data from my form. Now I just made a small example for learning purposes, there I have this:
class MainWindow : public QMainWindow

{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    Ui::MainWindow *ui;
 
    QFormLayout * formlo;
    QGroupBox *formGroupBox;
};

{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

    QFormLayout * formlo;
    QGroupBox *formGroupBox;
};

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and this:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    this->formlo = new QFormLayout;
    this->formlo->addRow(new QLabel("Elso sor:"),new QLineEdit);
    formGroupBox = new QGroupBox(tr("Form layout"));
    formGroupBox->setLayout(formlo);
 
    ui->formLayout->addWidget(formGroupBox);
}

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

    this->formlo = new QFormLayout;
    this->formlo->addRow(new QLabel("Elso sor:"),new QLineEdit);
    formGroupBox = new QGroupBox(tr("Form layout"));
    formGroupBox->setLayout(formlo);

    ui->formLayout->addWidget(formGroupBox);
}

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which works perfect, but no form is without purpose, so now I can't find the way how to extract the user-given input data from the QLineEdit. I thought maybe itemAt() could be my friend, but I'm not that sure about that, I'm a bit confused actually. Is there maybe a good built-in example? The "Basic Layouts" one gives hints only for displaying.