python - Saving class data containing pyqt objects -

i'm building pyqt app , i'm quite beginner python. let's store obj item in defined class:

class item (self):     def __init__(self, item_nbr, crop_pixmap, originepoint, designation):         self.item_nbr = item_nbr            # integer         self.crop_pixmap = crop_pixmap      # qpixmap         self.origin_point = originpoint     # qpoint         self.designation = designation      # str 

then work through gui perform other operation , create list of items. how can save list can open later ? pickle not work qpixmap , i'd save single.

you can use qsettings save application data. automatically convert data types qpixmap, qpoint, qcolor, etc. default, settings saved in platform-independant way, can save custom location if want.

here how read/write item class:

def settings(self):     # use custom location     return qtcore.qsettings('app.conf', qtcore.qsettings.iniformat)  def readsettings(self):     self.items = []     settings = self.settings()     index in range(settings.beginreadarray('items')):         settings.setarrayindex(index)         self.items.append(item(             settings.value('number', -1, int),             settings.value('pixmap', none, qtgui.qpixmap),             settings.value('point', none, qtcore.qpoint),             settings.value('designation', '', str),             ))  def writesettings(self):     settings = self.settings()     settings.beginwritearray('items')     index, item in enumerate(self.items):         settings.setarrayindex(index)         settings.setvalue('number', item.item_nbr)         settings.setvalue('pixmap', item.crop_pixmap)         settings.setvalue('point', item.origin_point)         settings.setvalue('designation', item.designation)     settings.endarray() 

the pyqt version of qsettings.value() allows specify both default value , expected type of value.