CLI+GUI

Eric Brunel eric.brunel at pragmadev.com
Mon Aug 11 09:58:02 CEST 2003


Michele Simionato wrote:
> mis6 at pitt.edu (Michele Simionato) wrote in message news:<2259b0e2.0308080948.5a95e383 at posting.google.com>...
> 
>>I wonder what is the recommended way of using Tkinter
>>together with a command line oriented application. 
> 
> 
> Replying to myself ...
> 
> I tried to implement what I discussed in my previous mail via the
> threading module:
> 
> #cmdriven.py
> 
> import Tkinter as t
> import cmd,threading
> 
> root=t.Tk()
> s=t.StringVar()
> s.set('ciao')
> label=t.Label(root,textvariable=s)
> label.pack()
> 
> class Cmd(cmd.Cmd):
>     def do_display(self,arg):
>         s.set(arg)
>     def do_quit(self,arg):
>         root.quit()
>         return 'quit' # anything <> None will do the job
>         
> def cmdloop(stringvar):
>     try: Cmd().cmdloop()
>     finally: pass # gracefully exit if sometimes goes wrong
> 
> thread=threading.Thread(target=cmdloop,args=(s,))
> thread.start()
> root.mainloop()
> 
> It works if I do something like
> 
> $ python cmdriven.py
> (Cmd) display hello
> (Cmd) display It works!
> (Cmd) quit
> 
> However, I wonder if this is a robust solution and if I should expect
> problems in more complicate situations (some time passes ... I have
> just discovered that this script hangs under Windows 98!)

I don't know if this is the problem, because you didn't say exactly when the 
script hangs, but Tkinter apparently has problems when calls to it are made from 
a thread different from the one into which it was initialized. I'd use an Event 
between Tkinter's thread and Cmd's thread, checking it regularly with Tkinter's 
after method.

HTH
-- 
- Eric Brunel <eric.brunel at pragmadev.com> -
PragmaDev : Real Time Software Development Tools - http://www.pragmadev.com





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