> 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.
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.