Thanks for all the suggestions.

Your solution works just fine.
But I think I'm going to adopt the POE framework for this project. I create one POE session to read an input and another one to integrate that input to my Tk Canvas.
I cannot give more details because I'm still learning how to set up POE environment.
But It seems to be a really promising way. You don't need to know in the low level how to corporate different tasks in the same time, POE takes care of that for you.

Cheers,

In reply to Re^4: solution for fileevent on Win32 ??? by cta
in thread solution for fileevent on Win32 ??? by cta

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