Re: [Pythoncard-users] "tail"ing a file

[Alex T. <al...@tw...>]

Cory Riddell wrote:

>I used PythonCard to create a simple gui front end to a program that
>dumps all of its output to a log file. What's the best way to show
>that log file in a text control? I'd like it to be continuously
>updated, just like the Unix tail command.
>
>Any advice?
>
>  
>
There's probably a better way (or any number of better ways :-), but ....

you can do it with a simple timer that reads from the file and appends 
to the text control will do it
(That's assuming you don't mind the text control growing to keep all the 
content - if you don't want that you'll need to do a bit more to trim 
data off the front ....)

I tried a very simple example, where there was just a TextArea, and the 
code just had

>     def on_initialize(self, event):
>         # if you have any initialization
>         # including sizer setup, do it here
>         self.f = open("log.txt")
>         self.tmr = timer.Timer(self.components.Log, -1)
>         self.tmr.start(1000)
>         pass
>
>     def on_Log_timer(self, event):
>         t = self.f.read()
>         if t == "": return
>         self.components.Log.AppendText(t)
>         return

this works for files being extended by saving from Emacs, and from "cat 
 > log.txt" in Cygwin - but you should obviously check it with one of 
your log files while it is being extended.

-- 
Alex Tweedly       http://www.tweedly.net



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