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Re: How to make a tkinter GUI work on top of a CUI program?

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  Re: How to make a tkinter GUI work on top of a CUI program? Beinan Li <li.beinan@gmail.com> - 2014-01-04 11:31 -0500

#63137 — Re: How to make a tkinter GUI work on top of a CUI program?

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... and thanks to Chris too.
Now I got the better idea how the subprocess module works.


On Sat, Jan 4, 2014 at 11:29 AM, Beinan Li <li.beinan@gmail.com> wrote:

> Thank you so much Jerry.
> I should have read though the man page more carefully.
> The available online cscope tutorials never mentioned the line-oriented
> mode.
>
>
>
> On Sat, Jan 4, 2014 at 1:35 AM, Jerry Hill <malaclypse2@gmail.com> wrote:
>
>> On Fri, Jan 3, 2014 at 9:44 PM, Beinan Li <li.beinan@gmail.com> wrote:
>> > But some console programs have their own shell or ncurse-like CUI, such
>> as
>> > cscope.
>> > So I figured that I need to first subprocess.popen a bidirectional pipe
>> and
>> > send command through stdin and get results from stdout and stderr.
>> >
>> > But in such a case I found that communicate('cmd') will freeze.
>>
>> Right.  communicate() waits for the subprocess to end, and the
>> subprocess is still waiting for you to do something.  Instead, you'll
>> need to read() and write() to the subprocess' stdin and stdout
>> attributes, probably something like this (untested):
>>
>> def OnClickBtn(self, event):
>>     print('OnClickBtn')
>>     self.subProc.stdin.write('symbolName\n')
>>     print(self.subProc.stdout.read())
>>
>> It looks like cscope has both a screen-oriented mode and a line-based
>> mode.  When you're working with a subprocess like this, you're going
>> to want to be in the line-based mode, so you'll probably want to add
>> -l or -L to your command line.
>>
>> --
>> Jerry
>>
>
>

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