如何用tkinter制作计时器？

Question

我正在试着做一个计时器，关闭我运行linux的电脑。选择使用spinbox的时间。因此，我们的想法是在spinbox中选择时间量，然后添加到命令sudo shutdown -P+15min（例如）。

到目前为止，它只是关闭，我不能一个简单的方法来做到这一点。你知道吗

timer program

from tkinter import *
import os
import time

def shutdown():
    hrs = spin1.get()
    command1 = ('sudo shutdown -P')
    #sum1 = command1 + hrs
    os.system('sudo shutdown -P') + ('hrs')
    print(os.system)

def cancel():
    command = ('sudo shutdown -c')
    os.system('sudo shutdown -c')
    print(command)



'''def hrs():
    spn1 = spin1.get()
    dsp1 = spn1
    lbltime ['text'] = dsp1'''

entry_width = 2
win = Tk()

spin1 = IntVar()
spn = IntVar()

win.title('SHUTDOWN')
win.geometry('300x250+300+150')
lbl = Label(win, text='SET YOUR SHUTDOWN')
lbl.place(x=80, y=30)


spin1 = Spinbox(win, from_=00, to=23, font=('arial',26,'bold'), width= entry_width, textvariable=spin1)
spin1.insert(0, '00')
spin1.place(x=130, y=60)

setup = Button(win, text='SET TIMER', font=('arial',16,'bold'), command=lambda :shutdown())
setup.place(x=90, y=130)

cnc = Button(win, text='CANCEL', font=('verdana',10, 'bold'),command= lambda :cancel())
cnc.place(x=120, y=180)

win.mainloop()

Answer 1

为了将hrs（用户选择的分钟数）添加到命令中，您可以使用+或使用format()将它添加到现有的字符串命令中，如我在解决方案中所示。同样，当使用sudo运行命令时，您需要输入密码，要自动执行此操作，您可以使用-S参数使sudo从STDIN读取密码，这里是"mypassword"。你知道吗

def shutdown():
    hrs = spin1.get()
    sd_command = 'echo mypassword | sudo -S shutdown -P +' + hrs # both will work
    sd_command = 'echo mypassword | sudo -S shutdown -P +{}'.format(hrs)
    os.system(command)
    print(command)

def cancel():
    cancel_command = 'echo mypassword | sudo -S shutdown -c'
    os.system(cancel_command)
    print(cancel_command)

---

如果您想添加关于关机计划的消息，您需要添加另一个标签，这里shutdown_schedule，它将显示var_schedule的内容，这是tkinter字符串变量，当用户计划或取消关机时，它将被修改。你知道吗

def shutdown():
    hrs = spin1.get()

    sd_time = time.strftime("%H:%M", time.localtime(time.time() + 60*int(hrs)))
    var_schedule.set('Shutdown scheduled for {}'.format(sd_time))

    sd_command = 'echo mypassword | sudo -S shutdown -P +' + hrs # both will work
    sd_command = 'echo mypassword | sudo -S shutdown -P +{}'.format(hrs)
    os.system(command)
    print(command)

def cancel():
    var_schedule.set('Shutdown not scheduled yet')

    cancel_command = 'echo mypassword | sudo -S shutdown -c'
       os.system(cancel_command)
    print(cancel_command)

var_schedule = StringVar()
var_schedule.set('Shutdown not scheduled yet')

shutdown_schedule = Label(win, textvariable=var_schedule)
shutdown_schedule.place(x=130, y=30)