QComboBox is connected to a function using following syntax:
myComboBox.activated.connect(self.myFunction )
But I need to be able to send the arguments from ComboBox to myFunction(). But if I use:
myComboBox.activated.connect(self.myFunction(myArg1, myArg2 )
I am getting
TypeError: connect() slot argument should be a callable or a signal, not 'NoneType'
What syntax needs to be used to connect a QComboBox to a function that is able to receive arguments sent from Comobobox?
EDITED LATER:
Here is the code resulting an TypeError:
connect() slot argument should be a callable or a signal, not 'NoneType'
from PyQt4 import QtCore, QtGui import sys class MyClass(object): def __init__(self, arg): super(MyClass, self).__init__() self.arg = arg class myWindow(QtGui.QWidget): def __init__(self, parent=None): super(myWindow, self).__init__(parent) self.comboBox = QtGui.QComboBox(self) self.comboBox.addItems([str(x) for x in range(3)]) self.myObject=MyClass(id(self) ) self.comboBox.activated.connect(self.myFunction(self.myObject, 'someArg')) def myFunction(self, arg1=None, arg2=None): print 'nt myFunction(): ', type(arg1),type(arg2) if __name__ == "__main__": app = QtGui.QApplication(sys.argv) app.setApplicationName('myApp') dialog = myWindow() dialog.show() sys.exit(app.exec_())
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Answer
After I posted a question Stachoverflow suggested a link which explained a lot. Here is the answer:
from PyQt4 import QtCore, QtGui class MyClass(object): def __init__(self, arg): super(MyClass, self).__init__() self.arg = arg class myWindow(QtGui.QWidget): def __init__(self, parent=None): super(myWindow, self).__init__(parent) self.comboBox = QtGui.QComboBox(self) self.comboBox.addItems([str(x) for x in range(3)]) self.myObject=MyClass(id(self) ) slotLambda = lambda: self.indexChanged_lambda(self.myObject) self.comboBox.currentIndexChanged.connect(slotLambda) @QtCore.pyqtSlot(str) def indexChanged_lambda(self, string): print 'lambda:', type(string), string if __name__ == "__main__": app = QtGui.QApplication(sys.argv) app.setApplicationName('myApp') dialog = myWindow() dialog.show() sys.exit(app.exec_())