Python + pyQT - send parameters to the connected Signal function

问题

This example works: (Here my function has no input parameters)

    QtCore.QObject.connect(ComboJobType1_1, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(QString)")) ,self.InputChanged())

But, It is necessary for me to send a parameter so I try this: (After updating my function to expect one parameter):

QtCore.QObject.connect(ComboJobType1_1, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(QString)")) ,self.InputChanged("ComboJobType1_1"))

Please note that the first example is working, the only problem (I guess) is sending a parameter to my function (I must know the name of the comboBox when I'm in the function).

Please advice... Thank you! Wish you a great day, Dolphin

回答1:

ref https://eli.thegreenplace.net/2011/04/25/passing-extra-arguments-to-pyqt-slot

    button1.clicked.connect(lambda: self.on_button(1))
    button2.clicked.connect(lambda: self.on_button(2))

def on_button(self, n):
    print('Button {0} clicked'.format(n))

worked for me, tht gives it a simple lambda (turn it to funciton ref instead of execute ?

回答2:

You need to provide the emitting object ("from_object") and the slot handler ("self.my_handler"):

QtCore.QObject.connect(from_object, QtCore.SIGNAL("nameOfSignal(QString)"), self.my_handler)

回答3:

Another way you can import partial function to pass arguments to slot function.

from functools import partial

QtCore.QObject.connect(ComboJobType1_1, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(QString)")) ,partial(self.InputChanged, "ComboJobType1_1"))

来源：https://stackoverflow.com/questions/11223599/python-pyqt-send-parameters-to-the-connected-signal-function

标签

python

function

parameters

combobox

pyqt