Question

我想要一个开始执行文件的按钮，以及另一个停止执行的按钮。以下代码不起作用，文件继续执行。（在这种情况下，文件只是一个循环，不断打印出“hello world”。）我如何实现我的目标？

import wx, sys
from threading import Thread
import time


class mywxframe(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self,None)
        pnl = wx.Panel(self)
        szr = wx.BoxSizer(wx.VERTICAL)
        pnl.SetSizer(szr)
        szr2 = self.sizer2(pnl)
        szr.Add(szr2, 1, wx.ALL|wx.EXPAND, 10)
        log = wx.TextCtrl(pnl, -1, style= wx.TE_MULTILINE, size = (300, -1))
        szr.Add(log, 0, wx.ALL, 10)
        btn3 = wx.Button(pnl, -1, "Stop")
        btn3.Bind(wx.EVT_BUTTON, self.OnStop)
        szr.Add(btn3, 0, wx.ALL, 10)
        self.CreateStatusBar()

        redir = RedirectText(log)
        sys.stdout=redir

        szr.Fit(self)
        self.Show()

    def sizer2(self, panel):
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.tc2 = wx.TextCtrl(panel, -1, 'Set Range', size = (100, -1))
        btn2 = wx.Button(panel, -1, "OK",)
        self.Bind(wx.EVT_BUTTON, self.OnStart, btn2)
        sizer.Add(self.tc2, 0, wx.ALL, 10)
        sizer.Add(btn2, 0, wx.ALL, 10)
        return sizer


    def OnStart(self, event):
        our_thread = Thread(target = self.WorkerThread)
        our_thread.start()

    def OnStop(self, event):
        self.dead = True


    def WorkerThread(self):
        self.dead = False
        while (not self.dead):
            execfile("P:\Computing and networking\Python\Learning programs\hello_world.py")
            if self.dead:
                break
        print "aborting"


class RedirectText(object):
    def __init__(self, aWxTextCtrl):
        self.out=aWxTextCtrl

    def write(self, string):
        wx.CallAfter(self.out.WriteText, string)


app = wx.App()
frm = mywxframe()
app.MainLoop()

Answer 1

您的GUI变得反应迟钝。这意味着您的长时间运行过程会阻止GUI的主循环。要使其工作，您需要子类Thread。这是一个适合我的版本：

import wx, sys
from threading import Thread
import time

class TestThread(Thread):

    def __init__(self):
        Thread.__init__(self)
        self.dead = False
        self.start()

    def run(self):
        while not self.dead:
            print "hi"
        print "aborted"

class mywxframe(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self,None)
        pnl = wx.Panel(self)
        szr = wx.BoxSizer(wx.VERTICAL)
        pnl.SetSizer(szr)
        szr2 = self.sizer2(pnl)
        szr.Add(szr2, 1, wx.ALL|wx.EXPAND, 10)
        log = wx.TextCtrl(pnl, -1, style= wx.TE_MULTILINE, size = (300, -1))
        szr.Add(log, 0, wx.ALL, 10)
        btn3 = wx.Button(pnl, -1, "Stop")
        btn3.Bind(wx.EVT_BUTTON, self.OnStop)
        szr.Add(btn3, 0, wx.ALL, 10)
        self.CreateStatusBar()

        redir = RedirectText(log)
        #sys.stdout=redir

        szr.Fit(self)
        self.Show()

    def sizer2(self, panel):
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        self.tc2 = wx.TextCtrl(panel, -1, 'Set Range', size = (100, -1))
        btn2 = wx.Button(panel, -1, "OK",)
        self.Bind(wx.EVT_BUTTON, self.OnStart, btn2)
        sizer.Add(self.tc2, 0, wx.ALL, 10)
        sizer.Add(btn2, 0, wx.ALL, 10)
        return sizer


    def OnStart(self, event):
        self.our_thread = TestThread()

    def OnStop(self, event):
        self.our_thread.dead = True


class RedirectText(object):
    def __init__(self, aWxTextCtrl):
        self.out=aWxTextCtrl

    def write(self, string):
        wx.CallAfter(self.out.WriteText, string)

app = wx.App()
frm = mywxframe()
app.MainLoop()

您可能需要查看以下资源，以获取有关wxPython和线程的其他信息：

按下按钮可停止文件执行

1 个答案: