Threading not working

问题

I am trying to get this little file copy application working which shows a progress bar, but I am not understanding why this won't work, as it locks up the gui whilst updating the gauge.

import shutil
import os
import threading
import wx

class MyFrame(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title)

        self.source = os.path.expanduser("~/Desktop/FolderToCopy")
        self.destination = os.path.expanduser("~/Desktop/BackupFolder/Temp")

        panel = wx.Panel(self, -1)
        vbox = wx.BoxSizer(wx.VERTICAL)
        hbox1 = wx.BoxSizer(wx.HORIZONTAL)
        hbox2 = wx.BoxSizer(wx.HORIZONTAL)
        hbox3 = wx.BoxSizer(wx.HORIZONTAL)
        hbox4 = wx.BoxSizer(wx.HORIZONTAL)

        self.getSourceSize = self.get_size(self.source)

        self.gauge = wx.Gauge(panel, -1, self.getSourceSize, size=(150, 25))
        self.btn1 = wx.Button(panel, wx.ID_OK)
        self.abortButton = wx.Button(panel, label="Abort")

        self.Bind(wx.EVT_BUTTON, self.OnButtonSelect, self.btn1)
        self.abortButton.Bind(wx.EVT_BUTTON, self.OnAbortButton, self.abortButton)

        hbox1.Add(self.gauge, 1, wx.ALIGN_CENTRE)
        hbox2.Add(self.btn1, 1, wx.RIGHT, 10)
        hbox4.Add(self.abortButton, 1, wx.RIGHT, 20)
        vbox.Add((0, 50), 0)
        vbox.Add(hbox1, 0, wx.ALIGN_CENTRE)
        vbox.Add((0, 30), 0)
        vbox.Add(hbox2, 1, wx.ALIGN_CENTRE)
        vbox.Add(hbox4, 1, wx.ALIGN_CENTRE)
        panel.SetSizer(vbox)
        self.Centre()

    def OnAbortButton(self, e):
        self.shouldAbort = True

    def get_size(self, start_path):
        total_size = 0
        for dirpath, dirnames, filenames in os.walk(start_path):
            for f in filenames:
                fp = os.path.join(dirpath, f)
                total_size += os.path.getsize(fp)
        total_size = total_size / 50
        return total_size

    def OnButtonSelect(self, event):
        thread1 = threading.Thread(target=shutil.copytree, args=(self.source, self.destination))
        thread1.start()
        self.thread1 = threading.Thread(target=self.OnGo(self))
        self.thread1.start()

    def OnCopy(self):
        shutil.copytree(self.source, self.destination)

    def OnGo(self, event):
        self.shouldAbort = False
        getDestinationSize = 0
        get_size = self.get_size
        while getDestinationSize < self.getSourceSize:
            getDestinationSize = get_size(self.destination)
            self.gauge.SetValue(getDestinationSize)
            if self.shouldAbort:
                break

app = wx.App(0)
frame = MyFrame(None, -1, 'gauge.py')
frame.Show(True)
app.MainLoop()

回答1:

    self.thread1 = threading.Thread(target=self.OnGo(self))
    self.thread1.start()

You're executing self.onGo on this line, before the thread even starts. Arguments to the target should be passed in via args. Since OnGo never actually uses its event parameter, you can just pass in None.

    self.thread1 = threading.Thread(target=self.OnGo, args=(None,))
    self.thread1.start()

来源：https://stackoverflow.com/questions/22353923/threading-not-working