我正在制作一个软件，其中有一个线程，按下按钮启动。但我不能停止它，即使它在条件while循环下

Question

我正在尝试做一个键盘映射软件，它有一个按钮，它激活了按键映射，这基本上启动了一个线程调用一个函数，其中有一个有条件的while循环检查按键。但问题是，即使我使用按钮将全局变量设置为false，线程也不会终止，直到我按下键盘上的一个键。

这有点让人沮丧..当您认为按键映射已停用，但随后您尝试关闭软件或尝试激活另一个按键映射时，它会显示错误，并且只要您按下某个键键入某些内容，光标就会在屏幕上单击并弹出现在您的按键映射已停用.

这是我的代码...有什么建议吗？

键映射函数

def keymapping():
    
    tree.bind('<Return>',func=lambda event=None:())
    
    global active
    global keymapping_running
    global x_cor
    global y_cor
    global start_range
    global end_range
    global selected
    global selected_iid
    global keymap_name
    
    keymapping_running = True
    
    while active:
        
        key = str(keyboard.read_key()).capitalize()
        
        x = int(str(mouse.get_position()).split('(')[1].split(',')[0])
        y = int(str(mouse.get_position()).split(')')[0].split(', ')[1])
                
        for i in saves[start_range+1:end_range+1]:
            i = str(i).split(" = ")
            if i[0] == key:
                x_cor = int(i[1].split(',')[0])
                y_cor = int(i[1].split(',')[1])
        
        if x_cor and y_cor: 
            
            mouse.move(x_cor-x,y_cor-y,absolute=False,duration=0.01)
            mouse.click('left')
    
            x_cor = 0
            y_cor = 0
            
        else:
            if keyboard.is_pressed('F9'):
                button_switch()
            
            elif keyboard.is_pressed('return'):
                
                if keyboard.is_pressed('return'):
                    pass
                
                if tree.selection() == ():
                    pass
                else:
                    app.wm_attributes("-topmost", 1)
                    tmsg.showerror("Already running",f"\'{keymap_name}\' is already running.")
                    app.wm_attributes("-topmost", 0)
            
            else:
                pass
                        
    tree.bind('<Return>',func=lambda event=None:button_switch())

    keymapping_running = False
    x_cor = 0
    y_cor = 0
    selected = ''
    selected_iid = ''
    app.wm_attributes("-topmost", 1)
    tmsg.showinfo("Keymapping Deactivated",f"\'{keymap_name}\' has been deactivated")
    app.wm_attributes("-topmost", 0)
    keymap_name = ''

开/关按钮功能

def button_switch():
    
    global active
    global keymap_name
    global selected
    global selected_iid
    
    if active:
        tree.item(selected,image=close_img)
        
        active_btn.config(image=on_img)
        active_btn_lbl.config(text='  Activate Keymapping  ')
        active = False
        
    else:
        
        if (not keymapping_running):
            
            if keymap:
                
                selected = tree.focus()
                
                if selected != '':
                    
                    selected_iid = tree.selection()
                    
                    if len(selected_iid) == 1:
                        
                        try:   
                            keymap_name = tree.item(selected,'values')[0]
                            for j in saves:
                                if str(j).split(' :- ')[0] == str(already_keymap_names[int(str(selected_iid).split(",")[0].split("'")[1])]).split(" :- ")[0]:
                                    global start_range
                                    start_range = saves.index(j) 
                                    global end_range
                                    end_range = start_range + int(str(saves[start_range]).split(" :- ")[1].split('(')[1].split(')')[0])     
            
                            active = True 
                            active_btn.config(image=stop_img)
                            tree.item(selected,image=done_img)
                            active_btn_lbl.config(text='Deactivate Keymapping')
                                                   
                            th = threading.Thread(target=keymapping)
                            th.start()
                            
                            tree.selection_remove(tree.focus())
                            
                            app.wm_attributes("-topmost", 1)
                            tmsg.showinfo("Keymapping Activated",f"\'{keymap_name}\' has been activated")
                            app.wm_attributes("-topmost", 0)
                        
                        except Exception as e:
                            print(e)
                            app.wm_attributes("-topmost", 1)
                            tmsg.showerror("Tampering",f"There has been tampering with the \'Saved_Keymappings.dll\' and we are unable to fetch \'{keymap_name}\'")
                            app.wm_attributes("-topmost", 0)
                    
                    elif len(selected_iid) == 0:
                        app.wm_attributes("-topmost", 1)
                        tmsg.showerror('Nothing selected','Please select a keymapping to activate.')
                        app.wm_attributes("-topmost", 0)
                    
                    else:
                        app.wm_attributes("-topmost", 1)
                        tmsg.showerror("Multiple Selected","You can't run multiple Keymappings together.")
                        app.wm_attributes("-topmost", 0)
                
                else:
                    app.wm_attributes("-topmost", 1)
                    tmsg.showerror('Nothing selected','Please select a keymapping to activate.')
                    app.wm_attributes("-topmost", 0)
            
            else:
                app.wm_attributes("-topmost", 1)
                tmsg.showerror("Nothing to Activate","You have no saved keymappings to activate.\n\nPlaese create a new keymapping before Activating")
                app.wm_attributes("-topmost", 0)
                
        else:
            app.wm_attributes("-topmost", 1)
            tmsg.showerror("Already running",f"\'{keymap_name}\' is already running.")
            app.wm_attributes("-topmost", 0)

Answer 1

您没有说明您正在使用哪个GUI (是tkinter吗？)，但是在大多数GUI中，按钮处理都是在GUI的事件循环中完成的，当事件发生时，它会调用代码上的回调，并且您的回调应该立即返回，以便事件循环可以继续处理更多事件。因此，如果回调包含阻止其立即返回的while循环，则GUI的事件处理代码将被阻止运行，因此不能/不能执行您期望它执行的事件处理任务。

解决方案是确保回调总是立即返回--尤其是，不要在回调中执行任何长度不定的while循环；而是将类中某些成员变量的状态设置为“记住”您正处于正在进行的事件中，这样以后的回调就可以检查这些成员变量，以便知道是否要做正确的事情。