Python 在子线程原因中的TextCtrl上放置值不会导致'；t始终工作，并导致随机分段故障

我正在尝试使用wxpython创建gui应用程序，但是

TextCtrl

元素出现了一些问题。我试图实现的效果是，用户将在文本字段（

command

）中输入一个命令，该命令可能会弹出一条出现在“（

out

）字段中的消息。一段时间后（本例中为0.7秒），消息将返回默认消息（

“输出”

）。我有两个问题：

消息并不总是出现

程序有时会因为分段错误而崩溃，我没有收到任何错误消息来处理它 我想这两者有某种联系，但我不知道为什么。在下面的示例中，我只键入“test”并等待原始消息出现。这两个问题都发生在这种情况下

我在这里发布了两个文件，作为最小的工作示例。文件号1，创建GUI

import wx
import os.path

import os

from threading import Thread
from time import sleep
from MsgEvent import *

class MainWindow(wx.Frame):
    def __init__(self):
        super(MainWindow, self).__init__(None, size=(400,200),)
#style=wx.MAXIMIZE)
        self.CreateInteriorWindowComponents()
        self.CreateKeyBinding()
        self.command.SetFocus()
        self.Layout()

    def Test(self):
        self.command.SetValue('open')
        self.ParseCommand(None)


    def PostMessage(self,msg):
        '''For its some reason, this function is called twice, 
        the second time without any input. I could'nt understand why. 
        For that, the test :if msg == None'''
        if msg == None: return 
        worker = MessageThread(self,msg,0.7,'OutPut')
        worker.start()

    def CreateKeyBinding(self):
        self.command.Bind(wx.EVT_CHAR,self.KeyPressed)

    def KeyPressed(self,event):
        char = event.GetUniChar()
        if char == 13 and not event.ControlDown(): #Enter
            if wx.Window.FindFocus() == self.command:
                self.ParseCommand(event)
        else:
            event.Skip()

    def ParseCommand(self,event):
        com = self.command.GetValue().lower() #The input in the command field

        self.PostMessage(com)

    def CreateInteriorWindowComponents(self):
        ''' Create "interior" window components. In this case it is just a
            simple multiline text control. '''
        self.panel = wx.Panel(self)

        font = wx.SystemSettings_GetFont(wx.SYS_SYSTEM_FONT)
        font.SetPointSize(12)

        self.vbox = wx.BoxSizer(wx.VERTICAL)

        #Out put field
        self.outBox = wx.BoxSizer(wx.HORIZONTAL)
        self.out = wx.TextCtrl(self.panel, style=wx.TE_READONLY|wx.BORDER_NONE)
        self.out.SetValue('OutPut')
        self.out.SetFont(font)
        self.outBox.Add(self.out,proportion=1,flag=wx.EXPAND,border=0)
        self.vbox.Add(self.outBox,proportion=0,flag=wx.LEFT|wx.RIGHT|wx.EXPAND,border=0)
        #Setting the backgroudn colour to window colour
        self.out.SetBackgroundColour(self.GetBackgroundColour())


        #Commands field
        self.commandBox = wx.BoxSizer(wx.HORIZONTAL)
        self.command = wx.TextCtrl(self.panel, style=wx.TE_PROCESS_ENTER)
        self.command.SetFont(font)
        self.commandBox.Add(self.command, proportion=1, flag=wx.EXPAND)
        self.vbox.Add(self.commandBox, proportion=0, flag=wx.LEFT|wx.RIGHT|wx.EXPAND, border=0)

        self.panel.SetSizer(self.vbox)
        return




    #Close the window
    def OnExit(self, event):
        self.Close()  # Close the main window.





app = wx.App()
frame = MainWindow()
frame.Center()
frame.Show()
app.MainLoop()

文件编号2，名为

MsgThread.py

处理事件

import wx
import threading 
import time

myEVT_MSG = wx.NewEventType()
EVT_MSG = wx.PyEventBinder(myEVT_MSG,1)

class MsgEvent(wx.PyCommandEvent):
    """ event to signal that a message is ready  """
    def __init__(self,etype,eid,msg='',wait=0,msg0=''):
        """ create the event object """
        wx.PyCommandEvent.__init__(self,etype,eid)
        self._msg = unicode(msg)
        self._wait_time = wait
        self._reset_message = unicode(msg0)

    def GetValue(self):
        """ return the value from the event """
        return self._msg



class MessageThread(threading.Thread):
    def __init__(self,parent,msg='',wait=0,msg0=''):
        """ 
        parent - The gui object that shuold recive the value
        value - value to handle
        """
        threading.Thread.__init__(self)
        if type(msg) == int:
            msg = unicode(msg)
        self._msg = msg
        self._wait_time = wait
        self._reset_message = msg0
        self._parent = parent
        print self._msg
    def run(self):
        """ overide thread.run Don't call this directly, its called internally when you call Thread.start()"""
        self._parent.out.SetValue(unicode(self._msg))
        time.sleep(self._wait_time)
        self._parent.out.SetValue(self._reset_message)
        self._parent.MessageFlag = False
        event = MsgEvent(myEVT_MSG,-1,self._msg)
        wx.PostEvent(self._parent,event)

---

什么是错误的

除了3个函数（WX.CallAfter、WX.CallLater、WX.PostEvent）之外，WX Python不是线程安全的

因此，基本上你要做的是确保你从不直接从子线程中调用任何小部件。您可以使用events或CallAfter

您可能还需要检查以下内容：

洛克拉