Question

我想将序列值读入我的Tkinter GUI。无论是进入文本窗口还是最终进入文本标签小部件，每小时更新一次。我遇到的问题是队列类。我得到的错误是： AttributeError：'Applcation'对象没有属性'queue'

这是我的代码：

#!/usr/bin/env python

from tkinter import *
from tkinter import messagebox
from time import sleep
import picamera
import os
import serial
import sys
import RPi.GPIO as GPIO
import _thread
import threading
import random
import queue

# Setup GPIO pin(s) 

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18, GPIO.OUT)
GPIO.output(18, False)


#==============================================================
# Declaration of Constants
# none used

#==============================================================

class SerialThread(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue.Queue()

    def read_sensor_values(self):
        ser = serial.Serial('/dev/ttyUSB0', 9600)
        while True:
            if ser.inWaiting:
                text = ser.readline(s.inWaiting)
                self.queue.put(text)
                self.pressures_txt.insert(0.0,values)






class Application(Frame):
    """ GUI Application for taking photos. """

    def __init__(self, master):
        super(Application, self).__init__(master)  
        self.grid()
        self.create_widgets()
        self.setup_camera()

    def create_widgets(self):

    Checkbutton( self, text = "Read Pressure Values", variable = self.mode2, command = self.process_serial, bg = 'white').grid(row = 4, column = 0, sticky = W+E+N+S)

    # create text field to display pressure values from arduino
        self.pressures_txt = Text(self, height = 3, wrap = WORD)
        self.pressures_txt.grid(row=9, column = 0, columnspan =3)

    def process_serial(self):
        #self.text.delete(1.0, END)
        while self.queue.qsize():
            try:
                self.text.insert(END, self.queue.get())
                self.pressures_txt.insert(0.0, self.queue.get())
            except queue.Empty:
                pass
        self.after('1000', self.process_serial)
     #................. end of method: read_sensor_values ................


#=================================================================
# main
#=================================================================

root = Tk()                             # Create the GUI root object
root.title("Control V1.0")
app = Application(root)                 # Create the root application window
root.mainloop()

我发布的代码是整个程序的缩写版本。我删除了一些与之无关的部分。我在python3中运行。我怀疑我的缩进可能有误，但我不确定。

我正在使用以下链接中的代码进行序列阅读课程：

https://www.daniweb.com/programming/software-development/threads/496499/using-a-checkbutton-to-import-serial-data-into-python-tkinter

Answer 1

问题是self.queue中的read_sensor_values属于SerialThread个对象。当您在self.queue对象的process_serial方法中说Application时，它会引用queue对象的不存在的Application属性。也许您应该将SerialThread对象作为Application对象的属性。然后process_serial可以引用self.serial.queue或其他任何名称。

Python Tkinter：读取序列值

1 个答案: