Question

I have two buttons, which the user can click and will open a FileDiagloag to select a file. I need the user to select two files but I want one function to handle both button calls. So in my init I have:

QtCore.QObject.connect(self.ui.Button_SelectJoinFiles_1, QtCore.SIGNAL('clicked()'), self.SelectLogFileToJoin(1))
QtCore.QObject.connect(self.ui.Button_SelectJoinFiles_2, QtCore.SIGNAL('clicked()'), self.SelectLogFileToJoin(2))

And the function is basically something like:

def SelectLogFileToJoin(self, ButtonNum):
        if(ButtonNum==1):
        ......
        if(ButtonNum==2)
        .....

But this doesn’t work because when I start the program it start by giving me a file select dialog.

Could someone please tell me how to handle passing an argument to a callback function?

Answer 1

The issue here is you are passing the value returned by the function, not the function itself. To do what you want, you will want to use functools.partial() to create a new function with pre-filled arguments:

from functools import partial

...

QtCore.QObject.connect(..., partial(self.SelectLogFileToJoin, 1))