On Thursday 26 April 2007 3:16 pm, Pradnyesh Sawant wrote:
> Hello,
> I have a pyqt4 code in which i'm trying the signal/slot mechanism. The
> (stripped) code is as follows:
>
> class D(QtCore.QThread):
> def __init__(self):
> QtCore.QThread.__init__(self)
> tpl = ("Primary", "priSec")
> print "tpl:", tpl
> self.emit(QtCore.SIGNAL("setLabel"), tpl)
> class Gui(QtGui.QDialog):
> def __init__(self, parent = None):
> QtGui.QDialog.__init__(self, parent)
> def setLabel(self, tpl):
> print "####tpl:", tpl
> print "**********tpl:", str(tpl)
> return
> if __name__ == "__main__":
> app = QtGui.QApplication(sys.argv)
> dialog = Gui()
> d = D()
> QtCore.QObject.connect(d, QtCore.SIGNAL("setLabel"),
> dialog.setLabel, QtCore.Qt.QueuedConnection)
> sys.exit(dialog.exec_())
>
> The output i'm getting is as follows:
>
> tpl: ('Primary', 'priSec')
> ####tpl: (<refcnt 0 at 0xb7caac8c>,)
> **********tpl: ((((((((<NULL>,),),),),),),),)
>
> Can anyone kindly tell me what's happening here? Why is the tuple
> ("Primary", "priSec") getting converted to this <NULL> thingy? And
> what is this thingy anyways (It looks to be a deeply nested tuple, but
> am not sure).
Works for me in that the setLabel() isn't executed at all - but then you are
emitting the signal before connecting it. Also my crystal ball isn't telling
me what versions you are using or what platform you are on.
Phil
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