get a value from secondary window and use it in main window

[Praanesh]

I have two windows. when I click a pushbutton in GUIWindow, it opens the settings window. The attribute 'new' is populated in the Settings_window. Now, I want the value stored in the attribute 'new' in class Settings_window to be used in the class GUIWindow. How do I do that? below is the code I wrote but when I run this I get an error saying Settings_window has no attribute 'new'. Can someone please help me resolve this issue.

device_id_lm_x = 4
device_id_lm_y = 5
device_id_lm_z = 6
class Settings_window(qtw.QWidget):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.sw = Ui_settings()
        self.sw.setupUi(self)

        self.sw.radio_lm_x_button.clicked.connect(self.choose_device_id)
        self.sw.radio_lm_y_button.clicked.connect(self.choose_device_id)
        self.sw.radio_lm_z_button.clicked.connect(self.choose_device_id)

        self.sw.set_button.clicked.connect(lambda: self.set_border(self.device_id))

    def choose_device_id(self):
        if self.sw.radio_lm_x_button.isChecked():
            self.device_id = device_id_lm_x
            print(self.device_id)
        elif self.sw.radio_lm_y_button.isChecked():
            self.device_id = device_id_lm_y
            print(self.device_id)
        elif self.sw.radio_lm_z_button.isChecked():
            self.device_id = device_id_lm_z
            print(self.device_id)

    def set_border(self, device_id):
        self.new = 1234
    
class GUIWindow(qtw.QWidget):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.ui = Ui_Form()
        self.ss = Settings_window()
        self.ui.setupUi(self)

        self.ui.new_button.clicked.connect(lambda: self.new_val(self.ss.new))
    
    def new_val(self, value):
        print(value)

[SGaist]

Hi and welcome to devnet,

Until set_border has been called, Settings_window has not attribute named new.

[Praanesh]

@SGaist Hi, I want the value in the attribute name 'new' that is populated in set_border method. That is where my attribute gets its value and I want to use that value in the main window.

[SGaist]

That I understood. However, the way you implemented it can't work.

When you click on "new_button", you are directly requesting the value of new from your Settings_window object which does not exists since it's only created in set_border.

[Praanesh]

@SGaist How else can I get the value from the attribute 'new' in the GUIWindow. can you please show me an example

[jsulm]

@Praanesh said in get a value from secondary window and use it in main window:

How else can I get the value from the attribute 'new' in the GUIWindow

Set self.new in constructor. It's really that simple...