QTableWidget - problems with setItem

[tickhead]

Hi, I'm new to programming in Qt and I'm having problems using the TableWidget. I first initialize the QTableWidget pointer in my MainWindow constructor to have a number of rows and columns, but once I try to initialize selected items in a loop, it doesn't work. I tried disabling the sorting option but it didn't help either. I tried setting a single item outside the loop and it worked fine. Here's the code:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->showMaximized();
    tab = new QTableWidget(10,10, this);
    this->setCentralWidget(tab);
    tab->setSortingEnabled(false);
}
 
void MainWindow::on_actionShow_dialog_window_triggered()
{
    foreach( QTableWidgetItem *i, tab->selectedItems() )
    {
        if(i)
        {
            i->setText("AAAA");
        }
        else
        {
            tab->setItem(i->row(), i->column(),  new QTableWidgetItem( "BBB" ));
        }
 
    }
    tab->setItem(3, 3, new QTableWidgetItem( "CCC" ) );
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->showMaximized();
    tab = new QTableWidget(10,10, this);
    this->setCentralWidget(tab);
    tab->setSortingEnabled(false);
}

void MainWindow::on_actionShow_dialog_window_triggered()
{
    foreach( QTableWidgetItem *i, tab->selectedItems() )
    {
        if(i)
        {
            i->setText("AAAA");
        }
        else
        {
            tab->setItem(i->row(), i->column(),  new QTableWidgetItem( "BBB" ));
        }

    }
    tab->setItem(3, 3, new QTableWidgetItem( "CCC" ) );
}

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Is it just one of those things that can't be done in a loop? How should I load some data out of a file and put it inside the table properly?

[tickhead]

I think I found the solution. Turns out that when I select some empty cells and write the number of them via the debugger (tab->selectedItems().count() ), it returns a 0, so no wonder the foreach loop does nothing. I guess the thread can be marked solved now.