我试图使GUI的测试台更加用户友好，但是他们要求使用停止按钮，该按钮将终止当前程序而不会终止实际的GUI窗口。
我了解线程化可能是实现此目的的方法，因为当按下“开始”按钮时，它将接管整个GUI窗口，并且无法单击任何内容，但是我不确定如何在代码中实际实现它。
我希望能够按下停止按钮并使GPIO返回其关闭状态，然后能够再次按下启动按钮并使程序重新从头开始。
import tkinter as tk
import RPi.GPIO as GPIO
import time as time
from time import sleep
#sets GPIO pin numbers#
GPIO4 = 4
GPIO17 = 17
GPIO27 = 27
GPIO22 = 22
GPIO23 = 23
GPIO24 = 24
#sets the initial state of the start button#
Start_state = True
#sets GPIOs to GPIO pin numbers#
GPIO.setmode(GPIO.BCM)
#sets warnings to not show#
GPIO.setwarnings(False)
#sets up GPIOs as outputs#
GPIO.setup(GPIO4, GPIO.OUT)
GPIO.setup(GPIO17, GPIO.OUT)
GPIO.setup(GPIO27, GPIO.OUT)
GPIO.setup(GPIO22, GPIO.OUT)
GPIO.setup(GPIO23, GPIO.OUT)
GPIO.setup(GPIO24, GPIO.OUT)
#sets initial states of the pins#
GPIO.output(GPIO4, False)
GPIO.output(GPIO17, False)
GPIO.output(GPIO27, False)
GPIO.output(GPIO22, False)
GPIO.output(GPIO23, False)
GPIO.output(GPIO24, False)
#start of main.loop()#
try:
####sets GUI window####
master = tk.Tk()
####name of GUI####
master.title("SOLENOID CONTROL")
####sets size of window (widthxheight)####
master.geometry ("650x150")
####sets initial states of GPIOs to 'off'####
GPIO4_state = False
GPIO17_state = False
GPIO27_state = False
GPIO22_state = False
GPIO23_state = False
GPIO24_state = False
####defines checkbutton states and relates them to individual GPIOs####
def GPIO4button():
global GPIO4_state
GPIO4_state = not GPIO4_state
def GPIO17button():
global GPIO17_state
GPIO17_state = not GPIO17_state
def GPIO27button():
global GPIO27_state
GPIO27_state = not GPIO27_state
def GPIO22button():
global GPIO22_state
GPIO22_state = not GPIO22_state
def GPIO23button():
global GPIO23_state
GPIO23_state = not GPIO23_state
def GPIO24button():
global GPIO24_state
GPIO24_state = not GPIO24_state
####defines dwell, spray times, and number of repititions (runs) from entry boxes####
def dwell():
dwell = e1.get()
def spray():
spray = e2.get()
def runs():
runs = e3.get()
####defines the start buttons actions####
def Start():
########gets input from entry boxes to be used in while loop#########
dwell = int(e1.get())
print('dwell: ' + str(dwell))
if e1.get() == 0:
time.sleep(e1.get())
else:
pass
spray = int(e2.get())
print('spray: ' + str(spray))
if e2.get() == 0:
time.sleep(e2.get())
else:
pass
runs = int(e3.get())
print('runs: ' + str(runs))
if e3.get() == 0:
runs = e3.get()
else:
pass
########defines the start buttons state and sets i = 0 for the 'runs' counter########
global Start_state
i = 0
########when the button is pushed do:########
if Start_state == True:
############starts loop for 'runs' counter############
while i < runs:
################prints states of GPIOs and sets state based on checkbutton input, sets dwell and spray time based on entry box input, runs sequentially################
print('gpio4: ' + str(GPIO4_state))
if GPIO4_state == True:
GPIO.output(GPIO4, True)
time.sleep(spray)
GPIO.output(GPIO4, False)
Start_state == False
time.sleep(dwell)
print('gpio17: ' + str(GPIO17_state))
if GPIO17_state == True:
GPIO.output(GPIO17, True)
time.sleep(spray)
GPIO.output(GPIO17, False)
Start_state == False
time.sleep(dwell)
print('gpio27: ' + str(GPIO27_state))
if GPIO27_state == True:
GPIO.output(GPIO27, True)
time.sleep(spray)
GPIO.output(GPIO27, False)
Start_state == False
time.sleep(dwell)
print('gpio22: ' + str(GPIO22_state))
if GPIO22_state == True:
GPIO.output(GPIO22, True)
time.sleep(spray)
GPIO.output(GPIO22, False)
Start_state == False
time.sleep(dwell)
print('gpio23: ' + str(GPIO23_state))
if GPIO23_state == True:
GPIO.output(GPIO23, True)
time.sleep(spray)
GPIO.output(GPIO23, False)
Start_state == False
time.sleep(dwell)
print('gpio24: ' + str(GPIO24_state))
if GPIO24_state == True:
GPIO.output(GPIO24, True)
time.sleep(spray)
GPIO.output(GPIO24, False)
Start_state == False
time.sleep(dwell)
else:
pass
################prints end of run + run number for east debug################
print('end: ' + str(i))
################adds 1 to the 'runs' to reach entry box value################
i += 1
############end of while loop############
else:
pass
####creates checkbutton and links it to button command####
####positions checkbutton in GUI window####
checkbutton1 = tk.Checkbutton(master, text="1", command=GPIO4button)
checkbutton1.grid(row=1, column=1)
checkbutton2 = tk.Checkbutton(master, text="2", command=GPIO17button)
checkbutton2.grid(row=1, column=2)
checkbutton3 = tk.Checkbutton(master, text="3", command=GPIO27button)
checkbutton3.grid(row=1, column=3)
checkbutton4 = tk.Checkbutton(master, text="4", command=GPIO22button)
checkbutton4.grid(row=1, column=4)
checkbutton5 = tk.Checkbutton(master, text="5", command=GPIO23button)
checkbutton5.grid(row=1, column=5)
checkbutton6 = tk.Checkbutton(master, text="6", command=GPIO24button)
checkbutton6.grid(row=1, column=6)
####labels checkbutton rows####
tk.Label(master, text="SOLENOIDS").grid(row=1, column=0)
####creates entry boxes and links them to entry variable####
####positions entry boxes in GUI window####
tk.Label(master, text="DWELL TIME").grid(row=6,column=7)
e1 = tk.Entry(master)
e1.grid(row=6, column=8)
tk.Label(master, text="SPRAY TIME").grid(row=7,column=7)
e2 = tk.Entry(master)
e2.grid(row=7, column=8)
tk.Label(master, text="RUNS").grid(row=8,column=7)
e3 = tk.Entry(master)
e3.grid(row=8, column=8)
####creates start, stop, and exit buttons and links them to respective commands####
####starts while loop####
Startbutton = tk.Button(master, text="START", bg="green", command=Start)
Startbutton.grid(row=10, column=7)
####stops current 'run'####
Stopbutton = tk.Button(master, text="STOP", bg="red", command=Start)
Stopbutton.grid(row=10, column=8)
####exits GUI window####
Exitbutton = tk.Button(master, text="EXIT", bg="red", command=master.destroy)
Exitbutton.grid(row=10, column=9)
####still no real idea####
master.mainloop()
#sets all GPIO back to original 'off' state#
finally:
GPIO.cleanup()
我希望能够按下停止按钮并使GPIO返回其关闭状态，然后能够再次按下启动按钮并使程序重新从头开始。
答案 0 :(得分：0)
如果启动长时间运行的功能，则必须在线程中运行它，但它可能无法访问GUI。
如果可以将功能拆分为较小的部分，则可以使用master.after(time, next_part)运行下一部分，然后mainloop()有时间更新GUI-即。它有时间运行分配给按钮STOP的功能-并且不会冻结。可以使用master.after()代替sleep()。
或者您可以在函数的许多位置使用master.update()，以便更新GUI-mainloop()将有时间运行分配给STOP按钮的函数。它不需要线程。
要结束程序，您可以在许多地方使用布尔变量（即if is_running:）。按钮STOP应该设置is_running = False，并且应该停止在if is_running:上运行功能。