訪問Tkinter單選按鈕的問題CTRL var

Question

我無法獲取所選單選按鈕的值。目前，當我在我的變數上使用.get()函數時，單選按鈕使用它返回「」什麼都沒有。如果我使用不帶.get()函數的消息框，則它返回PY_VAR x，其中x是tkinter變量的特定實例。

單選按鈕正確使用該變量，正如您一次只能選擇一個單選按鈕的事實所示，但我無法正確讀取該值。我想讀取當前選擇並將其放入不同的變量中。

下面是刪節代碼（您只能看到程序的單選按鈕部分）。

from tkinter import * 
from tkinter import messagebox, ttk 

class init_system: 
    def __init__(self): 
     self.init_vars = {"w_audiocodec": "Windows Media Audio 9.2 Lossless"} 

class render_window: 
    def __init__(self, height, width, window_title): 
     self.root_window = Tk() 
     w = width 
     h = height 
     ws = self.root_window.winfo_screenwidth() # width of the screen 
     hs = self.root_window.winfo_screenheight() # height of the screen 
     x = (ws/2) - (w/2) 
     y = (hs/2) - (h/2) 
     self.root_window.title(window_title) 
     self.root_window.minsize(width, height) 
     self.root_window.geometry('%dx%d+%d+%d' % (w, h, x, y)) 
     self.master_dictionary = {"radio_ctrl": StringVar()} 

    def new_button(self, button_text, button_command="", grid_row=0, grid_column=0, grid_sticky="NESW", grid_columnspan=1, grid_rowspan=1): 
     self.button = ttk.Button(self.root_window, text=button_text, command=button_command) 
     self.button.grid(row=grid_row, column=grid_column, sticky=grid_sticky, columnspan=grid_columnspan, rowspan=grid_rowspan) 
     self.responsive_grid(grid_row, grid_column) 

    def new_label(self, label_text, text_alignment="center", grid_row=0, grid_column=0, grid_sticky="NESW", grid_columnspan=1, grid_rowspan=1): 
     self.label = ttk.Label(self.root_window, text=label_text, anchor=text_alignment) 
     self.label.grid(row=grid_row, column=grid_column, sticky=grid_sticky, columnspan=grid_columnspan, rowspan=grid_rowspan) 
     self.responsive_grid(grid_row, grid_column) 

    def responsive_grid(self, row_responsive=0, column_responsive=0, row_weight_num=1, column_weight_num=1): 
     self.root_window.grid_columnconfigure(column_responsive, weight=column_weight_num) 
     self.root_window.grid_rowconfigure(row_responsive, weight=row_weight_num) 

    def new_radio_button(self, widget_text="Radio Button", radio_value="Radio Btn", radio_command="", grid_row=0, grid_column=0, grid_sticky="NESW", grid_columnspan=1, grid_rowspan=1): 
     self.radio_button = ttk.Radiobutton(self.root_window, text=widget_text, variable=self.master_dictionary["radio_ctrl"], value=radio_value, command=radio_command) 
     self.radio_button.grid(row=grid_row, column=grid_column, sticky=grid_sticky, columnspan=grid_columnspan, rowspan=grid_rowspan) 
     self.responsive_grid(grid_row, grid_column) 

class change_var_window(render_window): 

    change_var_window_values = {"example_data_below": "Check it out!", 
    "var_to_change": "show_ui", 
    "toggle": False, 
    "radio": False, 
    "free_form":False, 
    "line_one": "Current value of:", 
    "line_two": "some varible name here passwed with a dicrionary", 
    "Custom_Data_Bool": False, 
    "Custom_Disable": "Enable me", 
    "Custom_Enable": "Disable me", 
    "radio_list": [("Radio Button 1", "btn_1"), ("Radio Button 2", "btn_2"), ("Radio Button 3", "btn_3")], 
    "is_number": True} 

    def save_radio_var(self): 
     vars_system.init_vars[self.change_var_window_values["var_to_change"]] = self.master_dictionary["radio_ctrl"].get() 
     messagebox.showinfo("debug", self.master_dictionary["radio_ctrl"].get()) 

    def create_change_var_window(self): 
     self.new_label(self.change_var_window_values["line_one"], grid_columnspan=2) 
     self.new_label(self.change_var_window_values["line_two"], grid_row=1, grid_columnspan=2) 
     if self.change_var_window_values["radio"]: 
      grid_placement = 2 
      self.master_dictionary["radio_ctrl"] = StringVar() 
      #self.master_dictionary["radio_ctrl"].set(vars_system.init_vars[self.change_var_window_values["var_to_change"]]) 
      for radio_name, value in self.change_var_window_values["radio_list"]: 
       self.new_radio_button(widget_text=radio_name, radio_value=value, grid_row=grid_placement) 
       grid_placement +=1 
      grid_placement -=1 
      self.new_button("Cancle", self.root_window.destroy, grid_row=grid_placement, grid_column=1) 
      grid_placement -=1 
      self.new_button("Save", self.save_radio_var, grid_row=grid_placement, grid_column=1) 
      # Radio Requires: 
      # "radio_list" "var_to_change" 
     self.root_window.mainloop() 

def radio_example(): 
    radio = change_var_window(300, 350, "Radio Select") 
    radio.change_var_window_values.update({"free_form": False, "toggle": False, "radio": True, "var_to_change": "w_audiocodec", "line_one": "Current value of w_audiocodec:", "line_two": vars_system.init_vars["w_audiocodec"]}) 
    radio.change_var_window_values.update({"radio_list": [("Windows Media Audio 9.2", "Windows Media Audio 9.2"), ("Windows Media Audio 9.2 Lossless", "Windows Media Audio 9.2 Lossless"), ("Windows Media Audio 10 Professional", "Windows Media Audio 10 Professional")]}) 
    #main_window.root_window.withdraw() 
    radio.create_change_var_window() 

vars_system = init_system() 

main_window = render_window(200, 250, "Main Window") 
main_window.new_button("Radio Var", radio_example) 

main_window.root_window.mainloop() 

感謝您抽出時間來看看這個問題:-)

Answer 1

的問題是關係到你正在創建一個以上的根窗口的事實。您需要更改代碼，以便在程序生命週期中爲您創建Tk的一個實例。一個根中的小部件和變量不能與另一個根窗口中的小部件和變量共享。

如果您需要多個窗口，除根窗口外的所有窗口都需要爲Toplevel的實例。