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class MainWindow : public QMainWindow {

    Q_OBJECT

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

private slots:
    void on_itemDoubleClicked(QTreeWidgetItem * item, int column);

private:
    Ui::MainWindow *ui;
    QList<Contact*> contact_list;
    void fuellen();
};

void MainWindow::fuellen() {
            /* ..... */
            Contact temp_contact(parent);

            temp_contact.loadData(tr("contacts/")+fileInfo.fileName());
            contact_list.append(&temp_contact);
            /*......*/ 
}

void MainWindow::on_itemDoubleClicked(QTreeWidgetItem * item, int column) {
    QString temp = item->text(0);
    int index = temp.toInt();
    Contact* test = contact_list[index];
    QMessageBox::information(this, tr("Test"), test->getFirstname());
}