subprocess can not kill when app exit()

[Jason Friedman]

> code in below,  when close the app window.  the two ping process can not kill auto and keep in the windows 7 task list.
>
> During running, ping process under Python.exe as two thread. When app exit,  this two process move the system process and keep running there.
>
> could someone help to correct it.?
> Many thanks.

Hello,
That's a lot of code to read through.
I recommend you read
http://www.catb.org/~esr/faqs/smart-questions.html and then re-submit.
Good luck.