线程不起作用 [英] Threading not working

问题描述

我试图让这个显示进度条的小文件复制应用程序正常工作，但我不明白为什么这不起作用，因为它在更新仪表的同时锁定了 gui.

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()

推荐答案

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

您正在这一行上执行 self.onGo，甚至在线程开始之前.目标的参数应该通过 args 传入.由于 OnGo 从不实际使用它的 event 参数，您可以只传入 None.

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()

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