本文介绍了tkinter root.mainloop with While True 循环的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用 tkinter 根据我正在阅读的电压显示一些标签.但是，它在一次读取后停止执行.我发现这是由于 root.mainloop().但我无法修复它.我已经包含了我的代码.root.mainloop() 位于 while True 的末尾.
I am using tkinter to display some labels based on voltages I am reading. However, it stops executing after one read. I have found that it is due to root.mainloop(). But I am not able to fix it. I have included my code. The root.mainloop() is located right at the end of the while True.
from Tkinter import *
import spidev
import time
import os
import RPi.GPIO as GPIO
import numpy
GPIO.cleanup()
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(11, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)
GPIO.setup(15, GPIO.OUT)
GPIO.setup(12, GPIO.OUT)
adcvolt = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
batvolt = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
root = Tk() #Makes the window
w,h = root.winfo_screenwidth(), root.winfo_screenheight()
root.overrideredirect(1)
root.geometry("%dx%d+0+0"%(w,h))
labelFont = ("times",15 ,"bold", "italic")
labelText1 = StringVar()
labelText2 = StringVar()
labelText3 = StringVar()
labelText4 = StringVar()
labelText5 = StringVar()
labelText6 = StringVar()
labelText1.set("Battery Management System")
label1 = Label(root, textvariable=labelText1, height=3, anchor="center")
label1.config(font=labelFont)
label1.pack()
labelText2.set("Wait")
label2 = Label(root, textvariable=labelText2, height=3, anchor="center")
label2.config(font=labelFont)
label2.pack()
labelText3.set("Wait")
label3 = Label(root, textvariable=labelText3, height=3, anchor="center")
label3.config(font=labelFont)
label3.pack()
labelText4.set("Wait")
label4 = Label(root, textvariable=labelText4, height=3, anchor="center")
label4.config(font=labelFont)
label4.pack()
labelText5.set("Wait")
label5 = Label(root, textvariable=labelText5, height=3, anchor="center")
label5.config(font=labelFont)
label5.pack()
labelText6.set("Wait")
label6 = Label(root, textvariable=labelText6, height=3, anchor="center")
label6.config(font=labelFont)
label6.pack()
#root.wm_title("Window Title") #Makes the title that will appear in the top left
#root.config(background = "#FFFFFF") #sets background color to white
# Open SPI bus
spi = spidev.SpiDev()
spi.open(0,0)
# Function to read SPI data from MCP3008 chip
# Channel must be an integer 0-7
def ReadChannel(channel):
adc = spi.xfer2([1,(8+channel)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data
#Function to select multiplexer channel on 74HCT4067 chip
#Channel must be an integer 0-15
def MuxSelect(muxchannel):
if muxchannel == 0:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 1:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 2:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 3:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 4:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 5:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 6:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 7:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 8:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 9:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 10:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 11:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 12:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 13:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 14:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 15:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,1)
# Function to convert data to voltage level,
# rounded to specified number of decimal places.
def ConvertVolts(data,places):
volts = (data * 3.3) / 1023
volts = round(volts,places)
return volts
# Define sensor channels
voltage_channel = 0
# Define delay between readings
delay = 2
while True:
count = 0
while count<15:
MuxSelect(count)
# Read the voltage sensor data
voltage_level = ReadChannel(voltage_channel)
voltage_volts = ConvertVolts(voltage_level,2)
adcvolt[count] = voltage_volts
batvolt[count] = adcvolt[count] * 2.842
#print adcvolt[count]
#print batvolt[count]
#print count
count = count + 1
#time.sleep(delay)
labelText2.set('Cell1= '+str(batvolt[0])+'V Cell2= ' +str(batvolt[1])+'V Cell3= '+str(batvolt[2]))
#root.update()
labelText3.set('Cell4= '+str(batvolt[3])+'V Cell5= ' +str(batvolt[4])+'V Cell6= '+str(batvolt[5]))
# root.update()
labelText4.set('Cell7= '+str(batvolt[6])+'V Cell8= ' +str(batvolt[7])+'V Cell9= '+str(batvolt[8]))
# root.update()
labelText5.set('Cell10= '+str(batvolt[9])+'V Cell11= ' +str(batvolt[10])+'V Cell12= '+str(batvolt[11]))
# root.update()
labelText6.set('Cell13= '+str(batvolt[12])+'V Cell14= ' +str(batvolt[13])+'V Cell15= '+str(batvolt[14]))
root.update()
print "shit"
medianvolt = numpy.median(batvolt)
maxvolt = max(batvolt)
minvolt = min(batvolt)
diff1 = maxvolt-medianvolt
diff2 = medianvolt-minvolt
if diff1>0.02 or diff2>0.02:
GPIO.output (12,1)
time.sleep(120)
GPIO.output (12,0)
# Wait before repeating loop
time.sleep(delay)
root.update()
root.mainloop() #start monitoring and updating the GUI. Nothing below here runs.
推荐答案
Tkinter 需要 mainloop 工作(调用后面的所有函数).
使用 root.after(time_ms, function_name_without_() ) (before mainloop)
运行一些函数 - 该函数必须运行相同的 after(...) 才能在循环中工作.
Tkinter needs mainloop to work (to call all functions behind).
Use root.after(time_ms, function_name_without_() ) (before mainloop)
to run some function - and that function have to run the same after(...) to work in loop.
在 Tkinter 中你不使用 while True 因为 while True 是使 (main)loop
但是 Tkinter 有自己的 mainloop.
In Tkinter you don't use while True because while True is to make (main)loop
but Tkinter has own mainloop.
不要使用 sleep() - 使用 after()
And don't use sleep() - use after()
将 while True 中的所有代码(mainloop 除外)放入某个函数中，并使用 after() 调用它.
使用第二个 after() 代替 sleep().
Put all code from while True (except mainloop) in some function and call it using after().
Use second after() in place of sleep().
import Tkinter as tk
master = tk.Tk()
def my_mainloop():
print "Hello World!"
master.after(1000, my_mainloop)
master.after(1000, my_mainloop)
master.mainloop()
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