wxPython/demo/Process.py

   1
   2 import  wx
   3
   4 #----------------------------------------------------------------------
   5
   6 class TestPanel(wx.Panel):
   7     def __init__(self, parent, ID, log):
   8         wx.Panel.__init__(self, parent, ID)
   9         self.log = log
  10
  11         self.process = None
  12         self.Bind(wx.EVT_IDLE, self.OnIdle)
  13
  14         # We can either derive from wx.Process and override OnTerminate
  15         # or we can let wx.Process send this window an event that is
  16         # caught in the normal way...
  17         self.Bind(wx.EVT_END_PROCESS, self.OnProcessEnded)
  18
  19
  20         # Make the controls
  21         prompt = wx.StaticText(self, -1, 'Command line:')
  22         self.cmd = wx.TextCtrl(self, -1, 'python -u data/echo.py')
  23         self.exBtn = wx.Button(self, -1, 'Execute')
  24
  25         self.out = wx.TextCtrl(self, -1, '', style=wx.TE_MULTILINE|wx.TE_READONLY)
  26
  27         self.inp = wx.TextCtrl(self, -1, '', style=wx.TE_PROCESS_ENTER)
  28         self.sndBtn = wx.Button(self, -1, 'Send')
  29         self.termBtn = wx.Button(self, -1, 'Close Stream')
  30         self.inp.Enable(False)
  31         self.sndBtn.Enable(False)
  32         self.termBtn.Enable(False)
  33
  34         # Hook up the events
  35         self.Bind(wx.EVT_BUTTON, self.OnExecuteBtn, self.exBtn)
  36         self.Bind(wx.EVT_BUTTON, self.OnSendText, self.sndBtn)
  37         self.Bind(wx.EVT_BUTTON, self.OnCloseStream, self.termBtn)
  38         self.Bind(wx.EVT_TEXT_ENTER, self.OnSendText, self.inp)
  39
  40
  41         # Do the layout
  42         box1 = wx.BoxSizer(wx.HORIZONTAL)
  43         box1.Add(prompt, 0, wx.ALIGN_CENTER)
  44         box1.Add(self.cmd, 1, wx.ALIGN_CENTER|wx.LEFT|wx.RIGHT, 5)
  45         box1.Add(self.exBtn, 0)
  46
  47         box2 = wx.BoxSizer(wx.HORIZONTAL)
  48         box2.Add(self.inp, 1, wx.ALIGN_CENTER)
  49         box2.Add(self.sndBtn, 0, wx.LEFT, 5)
  50         box2.Add(self.termBtn, 0, wx.LEFT, 5)
  51
  52         sizer = wx.BoxSizer(wx.VERTICAL)
  53         sizer.Add(box1, 0, wx.EXPAND|wx.ALL, 10)
  54         sizer.Add(self.out, 1, wx.EXPAND|wx.ALL, 10)
  55         sizer.Add(box2, 0, wx.EXPAND|wx.ALL, 10)
  56
  57         self.SetSizer(sizer)
  58         self.SetAutoLayout(True)
  59
  60
  61     def __del__(self):
  62         if self.process is not None:
  63             self.process.Detach()
  64             self.process.CloseOutput()
  65             self.process = None
  66
  67
  68     def OnExecuteBtn(self, evt):
  69         cmd = self.cmd.GetValue()
  70
  71         self.process = wx.Process(self)
  72         self.process.Redirect();
  73         pid = wx.Execute(cmd, wx.EXEC_ASYNC, self.process)
  74         self.log.write('OnExecuteBtn: "%s" pid: %s\n' % (cmd, pid))
  75
  76         self.inp.Enable(True)
  77         self.sndBtn.Enable(True)
  78         self.termBtn.Enable(True)
  79         self.cmd.Enable(False)
  80         self.exBtn.Enable(False)
  81         self.inp.SetFocus()
  82
  83
  84     def OnSendText(self, evt):
  85         text = self.inp.GetValue()
  86         self.inp.SetValue('')
  87         self.log.write('OnSendText: "%s"\n' % text)
  88         self.process.GetOutputStream().write(text + '\n')
  89         self.inp.SetFocus()
  90
  91
  92     def OnCloseStream(self, evt):
  93         self.log.write('OnCloseStream\n')
  94         #print "b4 CloseOutput"
  95         self.process.CloseOutput()
  96         #print "after CloseOutput"
  97
  98     def OnIdle(self, evt):
  99         if self.process is not None:
 100             stream = self.process.GetInputStream()
 101
 102             if stream.CanRead():
 103                 text = stream.read()
 104                 self.out.AppendText(text)
 105
 106
 107     def OnProcessEnded(self, evt):
 108         self.log.write('OnProcessEnded, pid:%s,  exitCode: %s\n' %
 109                        (evt.GetPid(), evt.GetExitCode()))
 110
 111         stream = self.process.GetInputStream()
 112
 113         if stream.CanRead():
 114             text = stream.read()
 115             self.out.AppendText(text)
 116
 117         self.process.Destroy()
 118         self.process = None
 119         self.inp.Enable(False)
 120         self.sndBtn.Enable(False)
 121         self.termBtn.Enable(False)
 122         self.cmd.Enable(True)
 123         self.exBtn.Enable(True)
 124
 125
 126 #----------------------------------------------------------------------
 127
 128 def runTest(frame, nb, log):
 129     win = TestPanel(nb, -1, log)
 130     return win
 131
 132
 133 #----------------------------------------------------------------------
 134
 135
 136 overview = """\
 137 <html><body>
 138 <h2>wx.Process</h2>
 139
 140 wx.Process lets you get notified when an asyncronous child process
 141 started by wxExecute terminates, and also to get input/output streams
 142 for the child process's stdout, stderr and stdin.
 143
 144 <p>
 145 This demo launches a simple python script that echos back on stdout
 146 lines that it reads from stdin.  You can send text to the echo
 147 process' stdin by typing in the lower textctrl and clicking Send.
 148
 149 <p>
 150 Clicking the Close Stream button will close the demo's end of the
 151 stdin pipe to the child process.  In our case that will cause the
 152 child process to exit its main loop.
 153
 154 </body><html>
 155 """
 156
 157
 158 if __name__ == '__main__':
 159     import sys,os
 160     import run
 161     run.main(['', os.path.basename(sys.argv[0])])