[PyQt] QFileDialog , filterSelected() problem

[sa6113]

I'm using code like the following,
 
     s = "Raw data file (*.raw)";
     fd = QFileDialog (self)
     fileName = fd.getOpenFileName("","Text files (*.txt);;All files (*)" ,
self, "Open file")
 
     self.connect(fd, SIGNAL(filterSelected(const QString &)),
fd,self.filter )
     
     def filter(self,f) 
        QMessageBox.information(self, "Selected Filter", f )
      
 
I want to show a MessageBox to the user that inform s/he about which filter
that selected, 
but it doesn't work, it seems that SIGNAL won't be emitted , What is the
problem?

also I can't use :
self.connect(fd, SIGNAL(filterSelected(const QString &)), self,
SLOT(setFilter(s)))

the error is :
No such slot QFileDialog::setFilter(s)

Would you please help me ?
Looking forward,

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