Python + pyQT - send parameters to the connected Signal function

Question

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

After searching some similar questions, I tried the following: QtCore.QObject.connect(ComboJobType1_1, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(QString)")) ,lambda objName = "ComboJobType1_1": self.InputChanged(objName)) My function , for this try is: def InputChanged(self,objName): print objName And what I see in the print results is the selected value in my ComboBox and not the string I sent to my function... Please advice...... Thank you — Dolphinet
– Dolphinet, Commented Jun 27, 2012 at 10:05

Jack Wu · Accepted Answer · 2018-12-26 06:56:17Z

3

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 ?

answered Dec 26, 2018 at 6:56

Jack Wu

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kshahar · Accepted Answer · 2012-06-27 11:31:43Z

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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)

answered Jun 27, 2012 at 11:31

kshahar

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Dolphinet Over a year ago

Good morning, I managed to make it worked. Thanks anyway. I tried again the example with the lamda and now it's ok :)

Lester_wu · Accepted Answer · 2018-12-26 16:19:24Z

0

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"))

answered Dec 26, 2018 at 16:19

Lester_wu

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