更新wx MessageBox文本

Question

我正在读取湿度/温度传感器，并希望连续显示读数（例如，每500ms）当前，我只能在用户单击时更新输出。

# -*- coding: utf-8 -*-
from Phidget22.Devices.TemperatureSensor import *
from Phidget22.Devices.HumiditySensor import *
from Phidget22.Net import *
import wx

temp = 0
humd = 0

ct = TemperatureSensor()
ch = HumiditySensor()


def read_sensor():
    global temp, humd
    try:
        ct.openWaitForAttachment(500)
        ch.openWaitForAttachment(500)

    except PhidgetException as e:
        print("Phidget Exception %i: %s" % (e.code, e.details))
        print("Press Enter to Exit...\n")
        readin = sys.stdin.read(1)
        exit(1)

    temp = ct.getTemperature()
    ct.close()
    humd = ch.getHumidity()
    ch.close()


app = wx.App()

# simple dialog
read_sensor()
win1 = wx.MessageBox('Temperature:   %0.2fC \n============\nHumidity:   %0.2f%%' % (temp, humd),         'Environment',wx.OK | wx.CANCEL)

while win1 != wx.CANCEL:
    read_sensor()
    win1 = wx.MessageBox('Temperature:   %0.2fC \n============\nHumidity:   %0.2f%%' % (temp, humd), 'Environment',wx.OK | wx.CANCEL)
if win1 == wx.CANCEL:
    exit(-2)

我在文档中看到了对UpdateUI事件的引用，但是我不知道如何在我的代码中实现这一点。当前代码很浪费，因为它一次又一次地启动窗口，而不是简单地更新文本（这也会导致资源浪费）。

Answer 1

像这样的简单事物，带有wx.Timer应该使您入门。

import wx
import random # testing only
class MyFrame(wx.Frame):
    def __init__(self, parent, id=wx.ID_ANY, title=""):
        super(MyFrame, self).__init__(parent, id, title, size=(300,150))
        self.temp = 10
        self.humd = 75
        # Create a simple panel using positioned text widgets
        self.panel = wx.Panel(self)
        temp_lbl = wx.StaticText(self, label='Temperature:', pos=(20,10))
        humd_lbl = wx.StaticText(self, label='Humidity   :', pos=(20,50))
        self.disptemp = wx.StaticText(self, label="0", pos=(120,10))
        self.disphumd = wx.StaticText(self, label="0", pos=(120,50))
        self.exit = wx.Button(self, label="Stop", pos=(120,80))

        # Close routine if the Close X (top right corner) is clicked
        self.panel.Bind(wx.EVT_CLOSE, self.OnExit)
        self.exit.Bind(wx.EVT_BUTTON, self.OnExit)

        # Define a timer to run the OnTimer function every 500 micro seconds
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
        self.timer.Start(500)
        self.Show()

    def OnTimer(self, event):
        self.read_sensor()

    def read_sensor(self):
        #
        # call your sensor routine here updating self.time and self.humd
        # for testing purposes I simply increment hack them
        # You probably don't have to open and close each time
        # open on start| close on Exit and access with
        #    self.temp = ct.getTemperature()
        #    self.humd = ch.getHumidity()
        #
        self.temp = random.uniform(-20.0,50.0)
        self.humd = random.uniform(10.0,100.0)

        self.disptemp.SetLabel("%03.02f" % (self.temp))
        self.disphumd.SetLabel("%03.02f" % (self.humd))

    def OnExit(self, event):
        self.timer.Stop()
        self.Destroy()

if __name__ == "__main__":
    app = wx.App()
    frame = MyFrame(None,title="Current Temperature/Humidity")
    app.MainLoop()