PyQt: Can't show PY variable in QT filedialog as initially parameter

[ulysses]

Hi,

I use PyQt 3.8 non-commercial version in win32. I get a big question.
I Can't show PY variable in QT filedialog as initially parameter.

Code sample is following:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fileName="test.avi"

def saveSomething(aString):
    dl = QFileDialog.getSaveFileName(aString, "*.*", self, "FileDialog")
or 
    dl = QFileDialog.getSaveFileName(QString(aString), "*.*",
                                        self, "FileDialog")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
these code can't show corrent string.

If I use string constant.
   dl = QFileDialog.getSaveFileName("test.avi", "*.*", self, "FileDialog")

Dialog show it correctly.

Thanks.

Ulysses