我對 Python 相當陌生，這是我使用 tkinter 的第一個項目。我的整個項目運行良好，只有一個例外。我已將 tkinter 代碼構建到一個類中，一切正常，但我不知道如何從類外部調用這些方法。當我在 main 中的以下行創建對象時，出現 NameError: name 'robotGUI' is not Definedclass botGUI: def __init__(self): #Init Code def updateStatus(self): #Code HererobotGUI = botGUI()如果我將變量“robotGUI”初始化為 None，代碼就會運行，但是當我稍后嘗試訪問其方法之一時，我會收到 AttributeError: 'NoneType' object has no attribute 'doSomething'。似乎沒有創建 robotsGUI 對象，但我不明白為什么。我到處搜索并找到了一些接近的答案，但沒有任何與這個問題完全相關的答案。我有一些其他類在這個程序中運行得很好，所以我確信它與 tkinter 和它的內部主循環有關，只是無法確定它。這是我大大減少和簡化的代碼，顯示了問題：#!/usr/bin/env python3#Importsimport socket, select, errno, sys, queue, time, threading, cv2from tkinter import *from tkinter import fontfrom PIL import Image, ImageTk#GUIclass botGUI: def __init__(self): #Create the Window Object and Setup the Window self.window = Tk() self.window.geometry("800x480+0+0") self.window.overrideredirect(True) self.window.fullScreenState = False #Code to Generate Gaphics Here ..... #Call Repeating Status Update Script and Start the Main Loop self.updateStatus() self.window.mainloop() def updateStatus(self): #Code to Handle Updating Screen Objects Here .... print("Update Status Running") #Set this function to be called again self.window.after(1000, lambda: self.updateStatus()) def doSomething(self, myStr): #Code to change something on the screen ... print(f"Command: {str(myStr)}") def doSomethingElse(self, myStr): #Code to change something on the screen ... print(f"Command: {str(myStr)}")
2 回答
飲歌長嘯
TA貢獻1951條經驗 獲得超3個贊
self.window.mainloop()刪除的呼叫botGUI.__init__()，然后您可以：
創建以下實例
botGUI：robotGUI = botGUI()創建線程并啟動它
稱呼
roboGUI.window.mainloop()
下面是修改后的代碼：
#!/usr/bin/env python3
#Imports
import socket, select, errno, sys, queue, time, threading, cv2
from tkinter import *
from tkinter import font
from PIL import Image, ImageTk
#GUI
class botGUI:
def __init__(self):
#Create the Window Object and Setup the Window
self.window = Tk()
self.window.geometry("800x480+0+0")
self.window.overrideredirect(True)
self.window.fullScreenState = False
#Code to Generate Gaphics Here .....
#Call Repeating Status Update Script and Start the Main Loop
self.updateStatus()
#self.window.mainloop()
def updateStatus(self):
#Code to Handle Updating Screen Objects Here ....
print("Update Status Running")
#Set this function to be called again
self.window.after(1000, lambda: self.updateStatus())
def doSomething(self, myStr):
#Code to change something on the screen ...
print(f"Command: {str(myStr)}")
def doSomethingElse(self, myStr):
#Code to change something on the screen ...
print(f"Command: {str(myStr)}")
#Main Task - Since tKinter is running in the main loop, all of the main loop code is moved to here
def main_loop():
#global robotGUI
robotDataReceived = True #This is only for this posting
#Main Loop
while True:
#If Incoming Data from Robot, Get and Process It!
if robotDataReceived:
robotCmdHandler()
#Anti Blocking Delay (Much shorter, set higher for this post)
time.sleep(2)
#Robot Command Handler
def robotCmdHandler():
#global robotGUI
#Code to get a command string and process it goes here .....
cmd = "dosomething" #Temporary for this post
#Handle command
if (cmd == "dosomething"):
print("Processing Command")
robotGUI.doSomething("Do This")
if __name__ == '__main__':
#Create GUI Object
robotGUI = botGUI()
#Create and Start Threads
t1 = threading.Thread(target=main_loop, name='t1')
t1.start()
# start the GUI main loop
robotGUI.window.mainloop()
#Wait until threads are finished
t1.join()
心有法竹
TA貢獻1866條經驗 獲得超5個贊
您必須在所有函數之外定義 robotsGUI，如下所示：
robotGUI = None
def main_loop():
global robotGUI
robotDataReceived = True #This is only for this posting
#Main Loop
while True:
#If Incoming Data from Robot, Get and Process It!
if robotDataReceived:
robotCmdHandler()
#Anti Blocking Delay (Much shorter, set higher for this post)
time.sleep(2)
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