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##Andrea Gavana
#!/usr/bin/env python
# This sample demonstrates a simple use of wx.Process/wx.Execute to
# monitor an external program stdout
import wx
class ProcessFrame(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, title='Process/Execute example')
panel = wx.Panel(self)
self.label = wx.TextCtrl(panel, style=wx.TE_MULTILINE)
self.btn = wx.Button(panel, label="Start")
self.process = None
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(self.label, proportion=1, flag=wx.EXPAND)
sizer.Add(self.btn, proportion=0, flag=wx.EXPAND)
panel.SetSizerAndFit(sizer)
self.Bind(wx.EVT_BUTTON, self.OnButton)
self.Bind(wx.EVT_IDLE, self.OnIdle)
self.Bind(wx.EVT_END_PROCESS, self.OnProcessEnded)
def OnButton(self, event):
self.btn.Enable(False)
self.label.SetValue('')
self.LongRunning()
def LongRunning(self):
"""
This runs in the GUI thread but uses wx.Process and
wx.Execute to start and monitor a separate process.
"""
cmd = 'python -u external_program.py'
self.process = wx.Process(self)
self.process.Redirect()
wx.Execute(cmd, wx.EXEC_ASYNC, self.process)
def OnIdle(self, event):
""" This event handler catches the process stdout. """
if self.process is not None:
stream = self.process.GetInputStream()
if stream.CanRead():
text = stream.read()
self.label.AppendText(text)
def OnProcessEnded(self, event):
stream = self.process.GetInputStream()
if stream.CanRead():
text = stream.read()
self.label.AppendText(text)
self.btn.Enable(True)
self.label.AppendText('Finished')
if __name__ == "__main__":
app = wx.App(0)
frame = ProcessFrame(None)
frame.Show()
app.MainLoop()
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