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class qt_test : public QMainWindow
{
    Q_OBJECT

public:
    qt_test(QWidget *parent = 0);
    ~qt_test();

private:
    Ui::qt_testClass ui;
[b]private slots:
	void on_btnExit_clicked()  {close();}
	void on_actionExit_toggled(bool checked) {close();}[/b]
};

qt_test::qt_test(QWidget *parent)
    : QMainWindow(parent)
{
	ui.setupUi(this);
	connect(ui.actionExit,SIGNAL(toggled(bool)),this,SLOT(on_actionExit_toggled(bool)));
}

connect(ui.actionExit,SIGNAL(triggered()),this,SLOT(close()));

on_actionExit_triggered() {...}

connect(ui.actionExit,SIGNAL(triggred()),this,SLOT(close()));

class qt_test : public QMainWindow, private Ui::qt_testClass
{
....
};

connect(ui.actionExit,SIGNAL(triggred()),this,SLOT(close()));

on_actionExit_triggered() {...}