wxPython/demo/wxProcess.py

   1
   2 from wxPython.wx import *
   3
   4 #----------------------------------------------------------------------
   5
   6 class TestPanel(wxPanel):
   7     def __init__(self, parent, ID, log):
   8         wxPanel.__init__(self, parent, ID)
   9         self.log = log
  10
  11         self.process = None
  12         EVT_IDLE(self, self.OnIdle)
  13
  14         # We can either derive from wxProcess and override OnTerminate
  15         # or we can let wxProcess send this window an event that is
  16         # caught in the normal way...
  17         EVT_END_PROCESS(self, -1, self.OnProcessEnded)
  18
  19
  20         # Make the controls
  21         prompt = wxStaticText(self, -1, 'Command line:')
  22         self.cmd = wxTextCtrl(self, -1, 'python data/echo.py')
  23         self.exBtn = wxButton(self, -1, 'Execute')
  24
  25         self.out = wxTextCtrl(self, -1, '', style=wxTE_MULTILINE|wxTE_READONLY)
  26
  27         self.inp = wxTextCtrl(self, -1, '', style=wxTE_PROCESS_ENTER)
  28         self.sndBtn = wxButton(self, -1, 'Send')
  29         self.termBtn = wxButton(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         EVT_BUTTON(self, self.exBtn.GetId(), self.OnExecuteBtn)
  36         EVT_BUTTON(self, self.sndBtn.GetId(), self.OnSendText)
  37         EVT_BUTTON(self, self.termBtn.GetId(), self.OnCloseStream)
  38         EVT_TEXT_ENTER(self, self.inp.GetId(), self.OnSendText)
  39
  40
  41         # Do the layout
  42         box1 = wxBoxSizer(wxHORIZONTAL)
  43         box1.Add(prompt, 0, wxALIGN_CENTER)
  44         box1.Add(self.cmd, 1, wxALIGN_CENTER|wxLEFT|wxRIGHT, 5)
  45         box1.Add(self.exBtn, 0)
  46
  47         box2 = wxBoxSizer(wxHORIZONTAL)
  48         box2.Add(self.inp, 1, wxALIGN_CENTER)
  49         box2.Add(self.sndBtn, 0, wxLEFT, 5)
  50         box2.Add(self.termBtn, 0, wxLEFT, 5)
  51
  52         sizer = wxBoxSizer(wxVERTICAL)
  53         sizer.Add(box1, 0, wxEXPAND|wxALL, 10)
  54         sizer.Add(self.out, 1, wxEXPAND|wxALL, 10)
  55         sizer.Add(box2, 0, wxEXPAND|wxALL, 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 = wxProcess(self)
  72         self.process.Redirect();
  73         pid = wxExecute(cmd, false, 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             # Yes, this is weird.  For this particular stream, EOF
 103             # simply means that there is no data available to be read,
 104             # not truly the end of file.  Also, read() just reads all
 105             # the currently available data, not until the real EOF...
 106             if not stream.eof():
 107                 text = stream.read()
 108                 self.out.AppendText(text)
 109
 110
 111     def OnProcessEnded(self, evt):
 112         self.log.write('OnProcessEnded, pid:%s,  exitCode: %s\n' %
 113                        (evt.GetPid(), evt.GetExitCode()))
 114
 115         stream = self.process.GetInputStream()
 116         if not stream.eof():
 117             text = stream.read()
 118             self.out.AppendText(text)
 119
 120         self.process.Destroy()
 121         self.process = None
 122         self.inp.Enable(false)
 123         self.sndBtn.Enable(false)
 124         self.termBtn.Enable(false)
 125         self.cmd.Enable(true)
 126         self.exBtn.Enable(true)
 127
 128
 129 #----------------------------------------------------------------------
 130
 131 def runTest(frame, nb, log):
 132     win = TestPanel(nb, -1, log)
 133     return win
 134
 135
 136 #----------------------------------------------------------------------
 137
 138
 139 overview = """\
 140 <html><body>
 141 <h2>wxProcess</h2>
 142
 143 wxProcess lets you get notified when an asyncronous child process
 144 started by wxExecute terminates, and also to get input/output streams
 145 for the child process's stdout, stderr and stdin.
 146
 147 <p>
 148 This demo launches a simple python script that echos back on stdout
 149 lines that it reads from stdin.  You can send text to the echo
 150 process' stdin by typing in the lower textctrl and clicking Send.
 151
 152 <p>
 153 Clicking the Close Stream button will close the demo's end of the
 154 stdin pipe to the child process.  In our case that will cause the
 155 child process to exit its main loop.
 156
 157 </body><html>
 158 """