wxpython thread

最近寫python需要程式一直在迴圈裡面跑

如果用while true的話會當機,沒有辦法按下停止鍵

看了下面兩個非常好的reference來練習一下怎麼寫wxpython thread

Reference :

http://www.blog.pythonlibrary.org/2010/05/22/wxpython-and-threads/

http://wiki.wxpython.org/LongRunningTasks

在wxpython下有三個最安全的方式來寫thread

wx.PostEvent

wx.CallAfter

wx.CallLater

wx.PostEvent是最低階的方式,那那那那就先用它來寫寫看吧!!!!!

這個練習是使用者按下start鍵,表示開始執行另一個thread,然後右邊會反覆出現紅色與綠色的按鍵還有說明,最下面顯示這個迴圈已經被跑了幾次,每次跑的時候先從txt中讀出上次已經跑的次數,然後再繼續累加(所以要先在同一個資料夾下面準備一個test_cnt.txt的檔案),順便練習讀寫file還有把file放在textctrl中顯示,按下stop則停止這個thread

用wxglade建立好視窗之後要加入 from threading import Thread

這邊寫thread最主要的關鍵就是EVT_RESULT_ID

在wx.frame中再用ResultEvent來跟thread溝通

在wx.Frame中如果使用者按下start,則會連到thread class來執行run function

在run function中,先把txt中的值讀出來,int()把string轉成int來累加,利用wx.PostEvent(self._notify_window,ResultEvent("Green")) 來告訴wx.Frame class在GUI上要做甚麼變化,如果使用者按下STOP則會傳到abort中,然後傳到run中停止執行緒

test.py

import wx # begin wxGlade: dependencies import gettext # end wxGlade # begin wxGlade: extracode # end wxGlade ############### Definitions ############### from threading import Thread import time import os ########################################### ############### Threads ####################### # Define notification event for thread completion EVT_RESULT_ID = wx.NewId() def EVT_RESULT(win, func):     """Define Result Event."""     win.Connect(-1, -1, EVT_RESULT_ID, func) class ResultEvent(wx.PyEvent):     """Simple event to carry arbitrary result data."""     def __init__(self, data):         wx.PyEvent.__init__(self)         self.SetEventType(EVT_RESULT_ID)         self.data = data class WorkerThread(Thread):     def __init__(self,notify_window):         Thread.__init__(self)         self._notify_window = notify_window         self._want_abort = 0         self.start()     def run(self):                  print("Read test_cnt.txt ")         fread = file('test_cnt.txt','r')         while True:                        text = fread.readline()             if len(text) == 0:                 break;             print text             cnt = int(text)         fread.close()         while True:             time.sleep(1)             if self._want_abort:                 wx.PostEvent(self._notify_window,ResultEvent(None))                 return             wx.PostEvent(self._notify_window,ResultEvent("Green"))             time.sleep(1)             wx.PostEvent(self._notify_window,ResultEvent("Red"))             time.sleep(1)             fwrite = file('test_cnt.txt','w')             cnt += 1                                 fwrite.write("%s"%cnt)             fwrite.close()             time.sleep(1)             wx.PostEvent(self._notify_window,ResultEvent("cnt"))                  def abort(self):         self._want_abort = 1          ################################################ class MyFrame(wx.Frame):     def __init__(self, *args, **kwds):         # begin wxGlade: MyFrame.__init__         kwds["style"] = wx.DEFAULT_FRAME_STYLE         wx.Frame.__init__(self, *args, **kwds)         self.window_1 = wx.SplitterWindow(self, wx.ID_ANY, style=wx.SP_3D | wx.SP_BORDER)         self.window_1_pane_1 = wx.Panel(self.window_1, wx.ID_ANY)         self.start = wx.Button(self.window_1_pane_1, wx.ID_ANY, _("Start"))         self.stop = wx.Button(self.window_1_pane_1, wx.ID_ANY, _("Stop"))         self.window_1_pane_2 = wx.Panel(self.window_1, wx.ID_ANY)         self.light = wx.Button(self.window_1_pane_2, wx.ID_ANY, _(""))         self.status = wx.StaticText(self.window_1_pane_2, wx.ID_ANY, _("Status\n"))         self.cnt = wx.TextCtrl(self.window_1_pane_2, wx.ID_ANY, "")         self.__set_properties()         self.__do_layout()         # end wxGlade         ################# init function ##################         rd_log = open(os.path.join('', 'test_cnt.txt'), 'r')         self.cnt.SetValue(rd_log.read())         rd_log.close()         ################# function binding ###############         self.Bind(wx.EVT_BUTTON,self.EVTSTART,self.start)         self.Bind(wx.EVT_BUTTON,self.EVTSTOP,self.stop)         EVT_RESULT(self,self.updateDisplay)         self.worker = None         ###################################################         ################# function binding ###############     def EVTSTART(self,event):         print("Start testing")         self.worker = WorkerThread(self)              def EVTSTOP(self,event):         print("End testing")         self.worker.abort()     def updateDisplay(self,event):         if event.data is "Green":             self.light.SetBackgroundColour(wx.Colour(0, 255, 127))             self.status.SetLabel('Green')         if event.data is "Red":             self.light.SetBackgroundColour(wx.Colour(255, 0, 61))             self.status.SetLabel('Red')         if event.data is "cnt":             rd_log = open(os.path.join('', 'test_cnt.txt'), 'r')             self.cnt.SetValue(rd_log.read())             rd_log.close()         ###################################################     def __set_properties(self):         # begin wxGlade: MyFrame.__set_properties         self.SetTitle(_("Test"))         self.start.SetMinSize((100, 80))         self.stop.SetMinSize((100, 80))         self.window_1_pane_1.SetMinSize((192, 257))         self.light.SetMinSize((100, 40))         self.window_1_pane_2.SetMinSize((188, 257))         # end wxGlade     def __do_layout(self):         # begin wxGlade: MyFrame.__do_layout         sizer_2 = wx.BoxSizer(wx.VERTICAL)         sizer_5 = wx.BoxSizer(wx.VERTICAL)         sizer_3 = wx.BoxSizer(wx.HORIZONTAL)         sizer_4 = wx.BoxSizer(wx.VERTICAL)         sizer_4.Add(self.start, 0, wx.LEFT | wx.TOP | wx.BOTTOM, 20)         sizer_4.Add(self.stop, 0, wx.LEFT | wx.TOP, 20)         sizer_3.Add(sizer_4, 1, wx.EXPAND, 0)         self.window_1_pane_1.SetSizer(sizer_3)         sizer_5.Add(self.light, 0, wx.LEFT | wx.TOP, 40)         sizer_5.Add(self.status, 0, wx.LEFT | wx.RIGHT | wx.TOP | wx.ALIGN_CENTER_HORIZONTAL, 40)         sizer_5.Add(self.cnt, 0, wx.TOP | wx.ALIGN_CENTER_HORIZONTAL, 30)         self.window_1_pane_2.SetSizer(sizer_5)         self.window_1.SplitVertically(self.window_1_pane_1, self.window_1_pane_2)         sizer_2.Add(self.window_1, 1, wx.EXPAND, 0)         self.SetSizer(sizer_2)         sizer_2.Fit(self)         self.Layout()         # end wxGlade # end of class MyFrame if __name__ == "__main__":     gettext.install("app") # replace with the appropriate catalog name     app = wx.PySimpleApp(0)     wx.InitAllImageHandlers()     Test = MyFrame(None, wx.ID_ANY, "")     app.SetTopWindow(Test)     Test.Show()     app.MainLoop()

如果用callafter則如下

import wx # begin wxGlade: dependencies import gettext # end wxGlade # begin wxGlade: extracode # end wxGlade ############### Definitions ############### from threading import Thread from wx.lib.pubsub import Publisher import time import os ########################################### ############### Threads ####################### class WorkerThread(Thread):     def __init__(self,notify_window):               Thread.__init__(self)         self._notify_window = notify_window         self._want_abort = 0         self.start()     def run(self):                  print("Read test_cnt.txt ")         fread = file('test_cnt.txt','r')         while True:                        text = fread.readline()             if len(text) == 0:                 break;             print text             cnt = int(text)         fread.close()         while True:             time.sleep(1)             if self._want_abort:                 wx.CallAfter(Publisher().sendMessage, "update", None)                 return             wx.CallAfter(Publisher().sendMessage, "update", "Green")             time.sleep(1)             wx.CallAfter(Publisher().sendMessage, "update", "Red")             time.sleep(1)             fwrite = file('test_cnt.txt','w')             cnt += 1                                 fwrite.write("%s"%cnt)             fwrite.close()             time.sleep(1)             wx.CallAfter(Publisher().sendMessage, "update", "cnt")          def abort(self):         self._want_abort = 1 ################################################ class MyFrame(wx.Frame):     def __init__(self, *args, **kwds):         # begin wxGlade: MyFrame.__init__         kwds["style"] = wx.DEFAULT_FRAME_STYLE         wx.Frame.__init__(self, *args, **kwds)         self.window_1 = wx.SplitterWindow(self, wx.ID_ANY, style=wx.SP_3D | wx.SP_BORDER)         self.window_1_pane_1 = wx.Panel(self.window_1, wx.ID_ANY)         self.start = wx.Button(self.window_1_pane_1, wx.ID_ANY, _("Start"))         self.stop = wx.Button(self.window_1_pane_1, wx.ID_ANY, _("Stop"))         self.window_1_pane_2 = wx.Panel(self.window_1, wx.ID_ANY)         self.light = wx.Button(self.window_1_pane_2, wx.ID_ANY, _(""))         self.status = wx.StaticText(self.window_1_pane_2, wx.ID_ANY, _("Status\n"))         self.cnt = wx.TextCtrl(self.window_1_pane_2, wx.ID_ANY, "")         self.__set_properties()         self.__do_layout()         # end wxGlade         ################# init function ##################         rd_log = open(os.path.join('', 'test_cnt.txt'), 'r')         self.cnt.SetValue(rd_log.read())         rd_log.close()         ################# function binding ###############         self.Bind(wx.EVT_BUTTON,self.EVTSTART,self.start)         self.Bind(wx.EVT_BUTTON,self.EVTSTOP,self.stop)         Publisher().subscribe(self.updateDisplay, "update")         self.worker = None         ###################################################         ################# function binding ###############     def EVTSTART(self,event):         print("Start testing")         self.worker = WorkerThread(self)              def EVTSTOP(self,event):         print("End testing")         self.worker.abort()     def updateDisplay(self,event):         if event.data is "Green":             self.light.SetBackgroundColour(wx.Colour(0, 255, 127))             self.status.SetLabel('Green')         if event.data is "Red":             self.light.SetBackgroundColour(wx.Colour(255, 0, 61))             self.status.SetLabel('Red')         if event.data is "cnt":             rd_log = open(os.path.join('', 'test_cnt.txt'), 'r')             self.cnt.SetValue(rd_log.read())             rd_log.close()         ###################################################     def __set_properties(self):         # begin wxGlade: MyFrame.__set_properties         self.SetTitle(_("Test"))         self.start.SetMinSize((100, 80))         self.stop.SetMinSize((100, 80))         self.window_1_pane_1.SetMinSize((192, 257))         self.light.SetMinSize((100, 40))         self.window_1_pane_2.SetMinSize((188, 257))         # end wxGlade     def __do_layout(self):         # begin wxGlade: MyFrame.__do_layout         sizer_2 = wx.BoxSizer(wx.VERTICAL)         sizer_5 = wx.BoxSizer(wx.VERTICAL)         sizer_3 = wx.BoxSizer(wx.HORIZONTAL)         sizer_4 = wx.BoxSizer(wx.VERTICAL)         sizer_4.Add(self.start, 0, wx.LEFT | wx.TOP | wx.BOTTOM, 20)         sizer_4.Add(self.stop, 0, wx.LEFT | wx.TOP, 20)         sizer_3.Add(sizer_4, 1, wx.EXPAND, 0)         self.window_1_pane_1.SetSizer(sizer_3)         sizer_5.Add(self.light, 0, wx.LEFT | wx.TOP, 40)         sizer_5.Add(self.status, 0, wx.LEFT | wx.RIGHT | wx.TOP | wx.ALIGN_CENTER_HORIZONTAL, 40)         sizer_5.Add(self.cnt, 0, wx.TOP | wx.ALIGN_CENTER_HORIZONTAL, 30)         self.window_1_pane_2.SetSizer(sizer_5)         self.window_1.SplitVertically(self.window_1_pane_1, self.window_1_pane_2)         sizer_2.Add(self.window_1, 1, wx.EXPAND, 0)         self.SetSizer(sizer_2)         sizer_2.Fit(self)         self.Layout()         # end wxGlade # end of class MyFrame if __name__ == "__main__":     gettext.install("app") # replace with the appropriate catalog name     app = wx.PySimpleApp(0)     wx.InitAllImageHandlers()     Test = MyFrame(None, wx.ID_ANY, "")     app.SetTopWindow(Test)     Test.Show()     app.MainLoop()