Question

我为switch创建了一个简单的python程序。这个简单的程序工作正常。代码如下：

 import RPi.GPIO as GPIO
 from time import sleep
 GPIO.setwarnings(False)
 GPIO.setmode(GPIO.BOARD)
 GPIO.setup(40, GPIO.IN)

 count = 0
 flag = 0
 while True:
     input = GPIO.input(40)
     if ((not flag) and input):
         flag = input
         count += 1
         print "--------------------"
         print "Button is pressed"
         print "Flag = ", flag
         print "Count = ", count
         sleep(0.05)

     elif ((not input) and flag):
         flag = input
         count += 1
         print "--------------------"
         print "Button is debounce"
         print "Flag = ", flag
         print "Count = ", count
         sleep(0.05)

 GPIO.cleanup()

但是当我尝试创建一个wxPython程序来显示输出时第一次点击按钮的程序工作，但是当我释放按钮时，wxPython程序的输出保持不变，除了更新的时间，当我释放按钮时停止，当我按下按钮时继续。 wxPython程序如下：

import RPi.GPIO as GPIO
import datetime
import os

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(40, GPIO.IN)

count = 0
flag = 0
button = "None"
input = GPIO.input(40)

global update_time
update_time = datetime.datetime.strftime(datetime.datetime.now(), '%d-%m-%y     %H:%M:%S')

try:
    import wx
except ImportError:
    raise ImportError, "The wxPython module is required to run this program."

class OnOffApp_wx(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, size = (500, 200), title = 'ON / OFF Status')
        self.SetBackgroundColour(wx.WHITE)
        self.SetWindowStyle(wx.STAY_ON_TOP)
        self.parent = parent
        self.initialize()

    def initialize(self):
        sizer = wx.GridBagSizer()
        font = wx.Font(20, wx.DECORATIVE, wx.ITALIC, wx.NORMAL)
        self.SetFont(font)

        self.label1 = wx.StaticText(self, -1, label=u'Button Status : {}'.format(button))
        self.label1.SetBackgroundColour(wx.WHITE)
        self.label1.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label1, (1,0), (1,2), wx.EXPAND)

        self.label2 = wx.StaticText(self, -1, label=u'Flag Status : {}'.format(flag))
        self.label2.SetBackgroundColour(wx.WHITE)
        self.label2.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label2, (2,0), (1,3), wx.EXPAND)

        self.label3 = wx.StaticText(self, -1, label=u'Count Status : {}'.format(count))
        self.label3.SetBackgroundColour(wx.WHITE)
        self.label3.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label3, (3,0), (1,4), wx.EXPAND)

        self.label4 = wx.StaticText(self, -1, label=u'Time Updated : {}'.format(update_time))
        self.label4.SetBackgroundColour(wx.WHITE)
        self.label4.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label4, (4,0), (1,5), wx.EXPAND)

        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.on_timer, self.timer)
        self.timer.Start(50)

        self.SetSizer(sizer)
        self.Show(True)

    def on_timer(self,event):
        global update_time
        update_time = datetime.datetime.strftime(datetime.datetime.now(), '%d-%m-%y    %H:%M:%S')

        count = 0
        flag = 0                                  
        input = GPIO.input(40)
        if ((not flag) and input):
            flag = input
            count += 1
            button = 'Pressed'
            #self.label1.SetLabel("Button Status : Pressed")
            self.label1.SetLabel("Button Status : {}".format(button))
            self.label2.SetLabel("Flag Status : {}".format(flag))
            self.label3.SetLabel("Count Status : {}".format(count))
            self.label4.SetLabel("Time Updated : {}".format(update_time))

        elif ((not input) and flag):
            flag = input
            count += 1
            button = 'Debounce'
            #self.label1.SetLabel("Button Status : Debounce")
            self.label1.SetLabel("Button Status : {}".format(button))
            self.label2.SetLabel("Flag Status : {}".format(flag))
            self.label3.SetLabel("Count Status : {}".format(count))
            self.label4.SetLabel("Time Updated : {}".format(update_time))

if __name__ == "__main__":
    Rs = wx.App()
    OnOffApp_wx(None, -1, 'ON / OFF Status')
    Rs.MainLoop()

GPIO.cleanup()

帮助我使wxPython程序正常工作，因为按下按钮时输入和标志的状态变为1，计数增加1。当我释放按钮时，输入和标志的状态变为0，计数增加1。

Answer 1

在on_timer中，您每隔50毫秒将count和flag重新设置为零。
要么将它们作为变量传递到函数中，要么为了您的目的，在global函数中将它们简单地声明为on_timer会更容易。
所以：

count = 0
flag = 0

变为：

global count, flag

如何为交换机创建一个wxpython程序，根据交换机状态一直更新？

1 个答案: