python - 如何在 python tkinter GUIi 中显示一些测量结果 - 每秒新值

Question

我正在尝试使用传感器测量一些值并使用 python tkinter GUI 显示它。我设法创建了一个 GUI 和要测量的程序。现在我想在 GUI 中显示数据，因为我每秒都在获取新值，所以我想用新值更新屏幕。我见过比我能用textvariable的。但是如何初始化呢？程序启动时，由于一开始没有任何输出，所以显示错误。如何管理它。请有任何建议。最后如何每秒更新？

from tkinter import *
import tkinter.font
import numpy as np
import pigpio

win = Tk()
myFont = tkinter.font.Font(family = 'Verdana', size = 20, weight = 'bold')

win.geometry('800x480')
win.configure(background='#CD5C5C')

#------------------------------------------------------main program ----------------------------------#
def readSensors():
    #function body
    # output is a list with name measuredValues
    #measuredValues contains total 4 values as I have 4 sensors
    win.after(1000, readSensors)     #calling the function every second

#label names variable
output_1= StringVar()
output_2 = StringVar()
output_3 = StringVar()
output_4 = StringVar()

value0 = str(measuredValues[0])
value1= str(measuredValues[1])
value2 = str(measuredValues[2])
value3 = str(measuredValues[3])

output_1.set (value0)
output_2.set (value1)
output_3.set (value2)
output_4.set(value3)

#Labels
# i used textvariable to to measured values. but doesn't work so far
#display values
output_1_label = Label(win, textvariable = output_1,height =2, width = 12)
output_1_label.place(x=200, y=100)

output_2_label = Label(win, textvariable = output_2, height =2, width = 12)
output_2_label.place(x=200, y=200)

output_3_label = Label(win, textvariable = output_3,height =2, width = 12)
output_3_label.place(x=200, y=300)

output_4_label = Label(win, textvariable = output_4, height =2, width = 12)
output_4_label.place(x=200, y=400)

#how to update the window with new data?
win.after(1000, readSensor)
win.mainloop()

标签： pythonpython-3.xtkinter

Answer 1

您需要textvariables使用上次读取的传感器值更新变量集：

像这样 - 传感器读数被随机选择的值替换以模拟新的数据读数：

import tkinter as tk
import random


def readSensors():
    output_1.set(random.choice([0, 1, 2, 3, 4, 5]))
    output_2.set(random.choice([0, 1, 2, 3, 4, 5]))
    output_3.set(random.choice([0, 1, 2, 3, 4, 5]))
    output_4.set(random.choice([0, 1, 2, 3, 4, 5]))
    win.after(1000, readSensors)


win = tk.Tk()

win.geometry('800x480')
win.configure(background='#CD5C5C')

output_1 = tk.StringVar()
output_2 = tk.StringVar()
output_3 = tk.StringVar()
output_4 = tk.StringVar()

measuredValues = [0, 1, 2, 3, 4, 5]
value0 = str(measuredValues[0])
value1 = str(measuredValues[1])
value2 = str(measuredValues[2])
value3 = str(measuredValues[3])

output_1.set(value0)
output_2.set(value1)
output_3.set(value2)
output_4.set(value3)

output_1_label = tk.Label(win, textvariable=output_1, height=2, width=12)
output_1_label.place(x=200, y=100)

output_2_label = tk.Label(win, textvariable=output_2, height=2, width=12)
output_2_label.place(x=200, y=200)

output_3_label = tk.Label(win, textvariable=output_3, height=2, width=12)
output_3_label.place(x=200, y=300)

output_4_label = tk.Label(win, textvariable=output_4, height=2, width=12)
output_4_label.place(x=200, y=400)

win.after(1000, readSensors)
win.mainloop()