python - 执行 python 脚本并在 WXPython GUI 中显示进度

Question

我们如何在 WXPython GUI 中运行 python 脚本并显示日志。我已经尝试过，但它没有运行它，而是打开一个 cmd 并在那里运行。以前我只是从命令行运行 Python 脚本，它完成了他的工作，但新的要求不是打开命令提示符，而是应该打开 GUI 并执行主要的 python 脚本。我也是 python 新手(使用 python 进行操作以使其独立于平台的原因)。

`
import wx, os, logging, sys, subprocess

logger = logging.getLogger(__name__)

class WxTextCtrlHandler(logging.Handler):

   def __init__(self, ctrl):
       logging.Handler.__init__(self)
       self.ctrl = ctrl

   def emit(self, record):
       s = self.format(record) + '\n'
       wx.CallAfter(self.ctrl.WriteText, s)`


class WindowClass(wx.Frame):

   def __init__(self):
       TITLE = "wxPython Logging To A Control"
       wx.Frame.__init__(self, None, wx.ID_ANY, TITLE)
       panel = wx.Panel(self, wx.ID_ANY)
       log = wx.TextCtrl(panel, wx.ID_ANY, size=(300,200), style = wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL)
       py = os.path.join(os.getcwd(), 'test1.py')
       log = subprocess.call([sys.executable, py])
       sizer = wx.BoxSizer(wx.VERTICAL)
       sizer.Add(log, 1, wx.ALL|wx.EXPAND, 5)
       panel.SetSizer(sizer)
       handler = WxTextCtrlHandler(log)
       logger.addHandler(handler)
       #self.Centre
       FORMAT = "%(asctime)s %(levelname)s %(message)s"
       handler.setFormatter(logging.Formatter(FORMAT))
       logger.log(1,"More? click again!")
       label = wx.StaticText(panel, label = "Hello World", pos = (100,50))
       self.Show()

app = wx.App(False)
WindowClass()
app.MainLoop()`

Answer 1

我从未使用过日志记录，但我想您想要如下所示的内容:
您需要使用 subprocess.Popen 而不是 subprocess.call，然后poll 结果。
如果 Gui 要保持“事件”状态，您还需要调用 Yield，因为您将处于循环中，因此 wx MainLoop 将被有效卡住。

主程序

import wx
import subprocess
from signal import SIGKILL
import os

class MyFrame(wx.Frame):

    def __init__(self, parent, id=-1, title='External program test',
                 pos=wx.DefaultPosition, size=(600, 600)):
        wx.Frame.__init__(self, parent, id, title, pos, size)
        self.text1 = wx.TextCtrl(self, -1, '', wx.DefaultPosition, wx.Size(500,500),
                            wx.NO_BORDER | wx.TE_MULTILINE)
        stop_button = wx.Button(self, wx.ID_ANY, "&Stop", pos=(400,520))
        self.Bind(wx.EVT_BUTTON, self.OnStop)
        self.Bind(wx.EVT_CLOSE, self.OnClose)
        self.Show()
        #Call python with -u for unbuffer I/O
        p = subprocess.Popen(["python", "-u", "testp.py"], stdout=subprocess.PIPE, bufsize=-1)
        self.pid = p.pid
        #Poll process for output
        while p.poll() is None:
            x = p.stdout.readline().decode() #decode bytes but don't strip linefeeds
            self.text1.write(x)
            wx.GetApp().Yield() # Yield to MainLoop for interactive Gui
        self.text1.write("\nProcess has ended")

    def OnStop(self, event):
        try:
            os.kill(int(self.pid), SIGKILL)
            self.text1.write("\nProcess killed")
        except:
            self.text1.write("\nProcess has ended")

    def OnClose(self, event):
        self.Destroy()

if __name__ == '__main__':
    app = wx.App()
    frame = MyFrame(None)
    app.MainLoop()

调用的程序

import time
counter = 0
while counter < 40:
    print ("Counter:",counter)
    counter += 1
    time.sleep(0.5)

结果