PyQt4 signals and slots

Question

I am writing my first Python app with PyQt4. I have a MainWindow and a Dialog class, which is a part of MainWindow class:

self.loginDialog = LoginDialog();
         


        

Answer 1

I checked your code and it looks like the problem is in the way how you're connecting your signal

1. you emit the signal in Ui_Dialog class

   self.emit(QtCore.SIGNAL("aa()"))

2. you connect to the signal in Ui_MainWindow's setupUi method by calling

   QtCore.QObject.connect(self.loginDialog.ui, QtCore.SIGNAL("aa()"), self.login)

notice first parameter is changed to self.loginDialog.ui; your original connect call was using self.loginDialog which is of the LoginDialog type, whereas signal is emitted by the Ui_Dialog class which is ui property of the LoginDialog. After this change login method of the Ui_MainWindow got called

hope this helps, regards