run function before closing QMainWindow

[raphaelf]

Hi everybody..
QT: 4.1.3

I would like to run a function before i close my window (QMainWindow) like this and it is not working.
Can somebody see why?

MainWindow::MainWindow()   
{        
	ui.setupUi(this);     
.
.
.
connect(this, SIGNAL(close()), this, SLOT(deletePicture()));

MainWindow::MainWindow()   
{        
	ui.setupUi(this);     
.
.
.
connect(this, SIGNAL(close()), this, SLOT(deletePicture()));

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