Qt4 - How to close a window?

Hey!

I have a problem that I can't figure out..any help would be great

I'm a beginner at Qt and I'm trying to figure this out but I'm getting an error

My GUI should function such that on a specific button press a new window pops up and the old one shuts...
I got the new window to pop up and stuff and everything works fine..but i can't figure out how to close the old one... any pointers??

Code:

---

#include <QtGui>
#include "guistart.h"
//#include "addcluster.h"
 
// if we include <QtGui> there is no need to include every class used: <QString>, <QFileDialog>,...
 
guiStart::guiStart(QMainWindow *parent)
{
    setupUi(this); // this sets up GUI
 
    // signals/slots mechanism in action
    connect( nextButton, SIGNAL( clicked() ), this, SLOT( addClusterWindow() ) ); 
}
 
 
void guiStart::addClusterWindow()
{
    addCluster *window = new addCluster();
    window->show();
    this.close();
}

---

All my windows are QMainWindow .

The above code gives me this error

Code:

---

guistart.cpp: In member function ‘void guiStart::addClusterWindow()’:
guistart.cpp:20:7: error: request for member ‘close’ in ‘this’, which is of non-class type ‘guiStart* const’

---

I know there's a problem with the this.close()

Any help would be great guys!! Thanks!

this is a pointer, so you need to use this->close();