Function GetData() in wxImage

[Anand]

Hi

 I am writing an image viewer in wxPython using the wxImage class.
I want to manipulate the image data for effects. I tried to use the
GetData() method of the wxImage class which returns a const char *(wxWindows
documentation). 

 How do I manipulate this object. Is it a python object or a C unsigned char *
stream ? Can i apply std 'C' calls on it or do I need to use methods of
python ?

Concerned code...

 def myfunc:

   ...
   self.img = wxImage(fileName)
   chunk = self.img.GetData()  # What is this chunk ?
   pass


Thanks

Anand