python - Non-blocking realtime redirection stdout from process to wx.TextCtrl control -

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i've got countdown.exe file (source code of file below). when files executed write in console every second text. start execution of file when gui python app executed:

self.countdown_process = subprocess.popen("countdown.exe", shell=true, stdout=subprocess.pipe)

i redirect stdout in subprocess.pipe , start thread out_thread read stdout of process , add textctrl:

out_thread = outtextthread(self.countdown_process.stdout, self.addtext) out_thread.start()

this full code of python app:

import os import sys import wx  import subprocess, threading  class myframe(wx.frame):     def __init__(self):         super(myframe, self).__init__(none)         self._init_ctrls()      def _init_ctrls(self):         self.outtext = wx.textctrl(id=wx.newid(), value='', name='outtext',                                    parent=self, pos=wx.point(0, 0),                                    size=wx.size(0, 0), style=wx.te_multiline|wx.te_rich2)          self.outtext.appendtext("starting process...\n")         self.outtext.appendtext("waiting 10 seconds...\n")         self.countdown_process = subprocess.popen("countdown.exe", shell = true, stdout=subprocess.pipe)         out_thread = outtextthread(self.countdown_process.stdout, self.addtext)         out_thread.start()      def addtext(self, text):         self.outtext.appendtext(text)  class outtextthread(threading.thread):     def __init__(self, std_out, cb):         super(outtextthread, self).__init__()         self.std_out = std_out         self.cb = cb      def run(self):         text = none         while text != '':             text = self.std_out.readline()             self.cb(text)  if __name__ == '__main__':     app = wx.app(false)     frame = myframe()     frame.show(true)     app.mainloop()

the c++ code of countdown.exe simple:

#include <stdio.h> #include <time.h>  void wait ( int seconds ) {   clock_t endwait;   endwait = clock () + seconds * clocks_per_sec ;   while (clock() < endwait) {} }  int main () {   int n;   printf ("starting countdown...\n");   (n=10; n>0; n--)   {     printf ("%d\n",n);     wait (1);   }   printf ("fire!!!\n");   return 0; }

but have problem. start python app , must wait 10 second , 10 seconds stdout of countdown.exe written in textctrl can see on picture below: enter image description here want realtime writing stdout of countdown.exe in textctrl (self.outtext). how can this? tried using wx.callafter in addtext method:

def addtext(self, text):     wx.callafter(self.outtext.appendtext, text)

but it's useless.

you cannot call wxpython methods directly thread. line

self.cb(text)

won't work. if put threadsafe method, such wx.callafter, should work. see following links:

i wrote tutorial on redirecting stuff stdout text control here:


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