我設計了一個有兩個按鈕的應用程序，即CAL和SAV。因此，我有兩個功能，但問題是有時生產線操作員會錯誤地按下SAV按鈕。這樣就會出現屬性錯誤并導致程序卡住。如何克服這個問題？請指導我。這是我的代碼：class ADS1x15: """Base functionality for ADS1x15 analog to digital converters."""class ADS1115(ADS1x15): """Class for the ADS1115 16 bit ADC."""class AnalogIn: """AnalogIn Mock Implementation for ADC Reads."""import RPi.GPIO as GPIOimport tkinter as tkGPIO.setmode(GPIO.BCM)GPIO.setup(12,GPIO.IN) #Save ButtonGPIO.setup(5,GPIO.IN) #Cal Buttonroot=tk.Tk()root.geometry("1000x600")file = open("/home/pi/data_log.txt", "r") f = file.read().split(',') rangeh = int(f[3]) offset = int(f[4]) fullScale = int(f[5])chan=AnalogIn(ads,P0,P1)def cal(channel): global Dsel,cal_c,rangeh,offset,fullScale,chan cal_c = cal_c + 1 if cal_c == 1: root.L1 = tk.Label(root,text="Put Zero Weight and Press CAL btn",fg="brown",font="bold") root.L1.pack() root.L1.place(x=1,y=1) elif cal_c == 2: root.L1.destroy() offset = chan.value file = open("/home/pi/data_log.txt", "w") if os.stat("/home/pi/data_log.txt").st_size == 0: file.write("rangeh,offset,Full_Scale,\n") file.write(str(rangeh)+","+str(offset)+","+str(fullScale)) file.flush() root.L2 = tk.Label(root,text="Put Full Weight and Press SAV btn",fg="brown",font="bold") root.L2.pack() root.L2.place(x=1,y=1) def sav(channel): global rangeh,offset,fullScale file = open("/home/pi/data_log.txt", "w") if os.stat("/home/pi/data_log.txt").st_size == 0: file.write("rangeh,offset,Full_Scale,\n") file.write(str(rangeh)+","+str(offset)+","+str(fullScale)) file.flush() root.L2.destroy()此錯誤是由于root.L2.destroy()這一行而產生的。我可以阻止或禁用此sav函數，以便在不調用cal函數的情況下它不會執行嗎？
1 回答
紫衣仙女
TA貢獻1839條經驗 獲得超15個贊
強力解決方案是檢查 root 是否具有 L2 屬性
from tkinter import messagebox
def sav(channel):
if hasattr(root, 'L2'):
global rangeh, offset, fullScale
file = open("/home/pi/data_log.txt", "w")
if os.stat("/home/pi/data_log.txt").st_size == 0:
file.write("rangeh,offset,Full_Scale,\n")
file.write(str(rangeh) + "," + str(offset) + "," + str(fullScale))
file.flush()
root.L2.destroy()
else:
messagebox.showinfo('Unable to save', 'No data was generated yet')
更優雅的方法是在啟動時禁用保存按鈕，僅在執行 cal 函數后才啟用它。
我對 Raspberry Pi 的實現不太熟悉，因此這只是如何實現按鈕禁用的粗略草圖：從外觀上看，按鈕是通過 GPIO.add_event_detect 函數“連接”的。
所以我會從主腳本中刪除 sav-callback 并在 cal 腳本之后動態添加它，如下所示：
# [...] beginning of your script [...]
def cal(channel):
# [...] original body of cal function [...]
activate_save_button()
def activate_save_button():
GPIO.add_event_detect(12, GPIO.RISING, callback=sav, bouncetime=1000)
def deactivate_save_button():
GPIO.remove_event_detect(12)
def sav(channel):
# [...] original body of sav function [...]
# remove save button functionality after saving
deactivate_save_button()
def update():
""" function for continuous show value in every 500ms in tkinter window"""
GPIO.add_event_detect(5, GPIO.RISING, callback=cal, bouncetime=1000)
# line with callback=sav is deleted here
root.after(500, update)
root.mainloop()
添加回答
舉報
0/150
提交
取消