wxPython:线程问题 [英] wxPython: Problems with thread

问题描述

我的程序不断扩展.

在MainPanel类的MainProgram方法中，我正在使用其他程序中的某些函数.使用此方法时，GUI会挂起，直到完成为止，我想通过为此方法使用新线程来解决此问题.

In my MainProgram method in the MainPanel class I'm using some functions from an other program. While using this the GUI hangs until that is finished and I want to solve this by using a new thread for this method.

执行此操作时，执行OnRun时出现错误.它说:

While doing this I get an error when executing OnRun. It says:

Unhandled exception in thread started by <bound method MainPanel.OnIndex of <__main__.MainPanel; proxy of <Swig Object of type 'wxPanel *' at 0x526e238> >>

它认为这与将Som值设置为self.textOutput的OnIndex有关.现在，我该如何解决我的这个小问题?

It think this has something to do with the OnIndex setting som values to self.textOutput. Now, how can I solve this little problem of mine?

非常感谢您的帮助！ =)

Help is much appreciated! =)

import wx, thread 

ID_EXIT = 110

class MainPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)

        self.buttonRun = wx.Button(self, label="Run")
        self.buttonRun.Bind(wx.EVT_BUTTON, self.OnRun )
        self.buttonExit = wx.Button(self, label="Exit")
        self.buttonExit.Bind(wx.EVT_BUTTON, self.OnExit)

        self.labelChooseRoot = wx.StaticText(self, label ="Root catalog: ") 
        self.labelScratchWrk = wx.StaticText(self, label ="Scratch workspace: ")
        self.labelMergeFile = wx.StaticText(self, label ="Merge file: ")

        self.textChooseRoot = wx.TextCtrl(self, size=(210, -1))
        self.textChooseRoot.Bind(wx.EVT_LEFT_UP, self.OnChooseRoot)
        self.textScratchWrk = wx.TextCtrl(self, size=(210, -1))
        self.textMergeFile = wx.TextCtrl(self, size=(210, -1))
        self.textOutput = wx.TextCtrl(self, style=wx.TE_MULTILINE | wx.TE_READONLY)

        self.sizerF = wx.FlexGridSizer(3, 2, 5, 5)
        self.sizerF.Add(self.labelChooseRoot)  #row 1, col 1
        self.sizerF.Add(self.textChooseRoot)   #row 1, col 2
        self.sizerF.Add(self.labelScratchWrk)  #row 2, col 1
        self.sizerF.Add(self.textScratchWrk)   #row 2, col 2
        self.sizerF.Add(self.labelMergeFile)   #row 3, col 1
        self.sizerF.Add(self.textMergeFile)    #row 3, col 2

        self.sizerB = wx.BoxSizer(wx.VERTICAL)
        self.sizerB.Add(self.buttonRun, 1, wx.ALIGN_RIGHT|wx.ALL, 5)
        self.sizerB.Add(self.buttonExit, 0, wx.ALIGN_RIGHT|wx.ALL, 5)

        self.sizer1 = wx.BoxSizer()
        self.sizer1.Add(self.sizerF, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL, 10)
        self.sizer1.Add(self.sizerB, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.sizer2 = wx.BoxSizer()
        self.sizer2.Add(self.textOutput, 1, wx.EXPAND | wx.ALL, 5)

        self.sizerFinal = wx.BoxSizer(wx.VERTICAL)
        self.sizerFinal.Add(self.sizer1, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)
        self.sizerFinal.Add(self.sizer2, 1, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.SetSizerAndFit(self.sizerFinal)


    def OnChooseRoot(self, event):
        dlg = wx.DirDialog(self, "Choose a directory:", style=wx.DD_DEFAULT_STYLE)
        if dlg.ShowModal() == wx.ID_OK:
            root_path = dlg.GetPath()
            self.textChooseRoot.SetValue(root_path)
        dlg.Destroy()

    def OnRun(self, event):
        #Check first if input values are
        thread.start_new_thread(self.OnIndex, ())

    def OnIndex(self):
        #Do something and post to self.textOutput what you do.

    def OnExit(self, event):
        self.GetParent().Close()


class MainWindow(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="IndexGenerator", size=(430, 330), 
                          style=((wx.DEFAULT_FRAME_STYLE | wx.NO_FULL_REPAINT_ON_RESIZE | 
                                  wx.STAY_ON_TOP) ^ wx.RESIZE_BORDER))
        self.CreateStatusBar() 

        self.fileMenu = wx.Menu()
        self.fileMenu.Append(ID_EXIT, "E&xit", "Exit the program")
        self.menuBar = wx.MenuBar()
        self.menuBar.Append(self.fileMenu, "&File")
        self.SetMenuBar(self.menuBar)
        wx.EVT_MENU(self, ID_EXIT, self.OnExit)                    

        self.Panel = MainPanel(self)

        self.CentreOnScreen()
        self.Show()

    def OnExit(self,  event):
        self.Close()

if __name__ == "__main__":
    app = wx.App(False)
    frame = MainWindow()
    app.MainLoop()

这是OnRun和OnIndex方法的摘录.是否有一个()或一个(?)?

Here is an extract of the OnRun and OnIndex methods. Is there a () to much or maybe an , ?

    def OnRun(self, Event=None):
        #---Check input values, continue if not wrong
        if self.CheckValid() == 0:
            #Get root directory
            root_path = self.textChooseRoot.GetValue()
            #Get scratch workspace
            scratch_workspace =self.textScratchWrk.GetValue()
            #Get merge file
            merge_fil = self.textMergeFile.GetValue()

            thread.start_new_thread(self.OnIndex, (root_path,scratch_workspace,merge_fil))

    def showmsg(self, msg):
        self.textOutput.AppendText(msg + "\n")


    def OnIndex(self,root_path,scratch_workspace,merge_fil):
            #---PUBSUB - publishes a message to the "show.statusbar"
##            msg = "Please wait...Program is running..."
##            Publisher().sendMessage(("show.statusbar"), msg)
            #---START INDEX GENERATOR CODE
            gp.overwriteoutput = 1
            gp.OutputMFlag = "DISABLED"
            gp.OutputZFlag = "DISABLED"
            fc_List = {}


            #Get log file. For now a constant. Needs to be changed.
            logfil = open("C:\\Python26\\Code\\log.txt", mode = "w")

            fold_nr = 0
            for root_fold, dirs, files in os.walk(root_path):
                root_fold_low = root_fold.lower()
                if not root_fold_low.find(".gdb") > -1:
                    fold_nr += 1
                    tot_t = time.clock()

                    wx.CallAfter(self.textOutput.AppendText, ("Mappe : " + str(fold_nr) + " : " + root_fold + "\n"))

推荐答案

与wx对象的所有交互都应在主线程中.

All interaction with wx object should be in the main thread.

一个简单的解决方法是使用wx.CallAfter(self.textOutput.SetValue, "output")之类的东西代替self.textOutput.SetValue("output").

An easy fix would be to use something like wx.CallAfter(self.textOutput.SetValue, "output") instead of self.textOutput.SetValue("output").

wx.CallAfter一旦到达它，便立即将要执行的内容发送到主even循环，并且由于main循环位于主线程中，所以一切正常.

wx.CallAfter sends to the main even loop what to execute as soon as it gets around to it and since the main loop is in the main thread everything works out fine.

更新:有效的合并代码段:

UPDATE: Working merged code snippets:

import wx, thread, os, time

ID_EXIT = 110

class Dummy:
    pass

gp = Dummy()

class MainPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)

        self.buttonRun = wx.Button(self, label="Run")
        self.buttonRun.Bind(wx.EVT_BUTTON, self.OnRun )
        self.buttonExit = wx.Button(self, label="Exit")
        self.buttonExit.Bind(wx.EVT_BUTTON, self.OnExit)

        self.labelChooseRoot = wx.StaticText(self, label ="Root catalog: ") 
        self.labelScratchWrk = wx.StaticText(self, label ="Scratch workspace: ")
        self.labelMergeFile = wx.StaticText(self, label ="Merge file: ")

        self.textChooseRoot = wx.TextCtrl(self, size=(210, -1))
        self.textChooseRoot.Bind(wx.EVT_LEFT_UP, self.OnChooseRoot)
        self.textScratchWrk = wx.TextCtrl(self, size=(210, -1))
        self.textMergeFile = wx.TextCtrl(self, size=(210, -1))
        self.textOutput = wx.TextCtrl(self, style=wx.TE_MULTILINE | wx.TE_READONLY)

        self.sizerF = wx.FlexGridSizer(3, 2, 5, 5)
        self.sizerF.Add(self.labelChooseRoot)  #row 1, col 1
        self.sizerF.Add(self.textChooseRoot)   #row 1, col 2
        self.sizerF.Add(self.labelScratchWrk)  #row 2, col 1
        self.sizerF.Add(self.textScratchWrk)   #row 2, col 2
        self.sizerF.Add(self.labelMergeFile)   #row 3, col 1
        self.sizerF.Add(self.textMergeFile)    #row 3, col 2

        self.sizerB = wx.BoxSizer(wx.VERTICAL)
        self.sizerB.Add(self.buttonRun, 1, wx.ALIGN_RIGHT|wx.ALL, 5)
        self.sizerB.Add(self.buttonExit, 0, wx.ALIGN_RIGHT|wx.ALL, 5)

        self.sizer1 = wx.BoxSizer()
        self.sizer1.Add(self.sizerF, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL, 10)
        self.sizer1.Add(self.sizerB, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.sizer2 = wx.BoxSizer()
        self.sizer2.Add(self.textOutput, 1, wx.EXPAND | wx.ALL, 5)

        self.sizerFinal = wx.BoxSizer(wx.VERTICAL)
        self.sizerFinal.Add(self.sizer1, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)
        self.sizerFinal.Add(self.sizer2, 1, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.SetSizerAndFit(self.sizerFinal)


    def OnChooseRoot(self, event):
        dlg = wx.DirDialog(self, "Choose a directory:", style=wx.DD_DEFAULT_STYLE)
        if dlg.ShowModal() == wx.ID_OK:
            root_path = dlg.GetPath()
            self.textChooseRoot.SetValue(root_path)
        dlg.Destroy()

    def CheckValid(self):
        return 0

    def OnRun(self, Event=None):
        #---Check input values, continue if not wrong
        if self.CheckValid() == 0:
            #Get root directory
            root_path = self.textChooseRoot.GetValue()
            #Get scratch workspace
            scratch_workspace =self.textScratchWrk.GetValue()
            #Get merge file
            merge_fil = self.textMergeFile.GetValue()

            thread.start_new_thread(self.OnIndex, (root_path,scratch_workspace,merge_fil))

    def showmsg(self, msg):
        self.textOutput.AppendText(msg + "\n")

    def OnIndex(self,root_path,scratch_workspace,merge_fil):
            #---PUBSUB - publishes a message to the "show.statusbar"
##            msg = "Please wait...Program is running..."
##            Publisher().sendMessage(("show.statusbar"), msg)
            #---START INDEX GENERATOR CODE
            gp.overwriteoutput = 1
            gp.OutputMFlag = "DISABLED"
            gp.OutputZFlag = "DISABLED"
            fc_List = {}


            #Get log file. For now a constant. Needs to be changed.
            #logfil = open("C:\\Python26\\Code\\log.txt", mode = "w")

            fold_nr = 0
            for root_fold, dirs, files in os.walk(root_path):
                root_fold_low = root_fold.lower()
                if not root_fold_low.find(".gdb") > -1:
                    fold_nr += 1
                    tot_t = time.clock()

                    wx.CallAfter(self.textOutput.AppendText, ("Mappe : " + str(fold_nr) + " : " + root_fold + "\n"))

    def OnExit(self, event):
        self.GetParent().Close()


class MainWindow(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="IndexGenerator", size=(430, 330), 
                          style=((wx.DEFAULT_FRAME_STYLE | wx.NO_FULL_REPAINT_ON_RESIZE | 
                                  wx.STAY_ON_TOP) ^ wx.RESIZE_BORDER))
        self.CreateStatusBar() 

        self.fileMenu = wx.Menu()
        self.fileMenu.Append(ID_EXIT, "E&xit", "Exit the program")
        self.menuBar = wx.MenuBar()
        self.menuBar.Append(self.fileMenu, "&File")
        self.SetMenuBar(self.menuBar)
        wx.EVT_MENU(self, ID_EXIT, self.OnExit)                    

        self.Panel = MainPanel(self)

        self.CentreOnScreen()
        self.Show()

    def OnExit(self,  event):
        self.Close()

if __name__ == "__main__":
    app = wx.App(False)
    frame = MainWindow()
    app.MainLoop()

这篇关于wxPython:线程问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！