Killing process

I am using os.getpid() to get the pid value for a script running. I
store that value (as a string) to a file. Later when I try to kill that
pid (i pull this from the file as a string value) I get errors.

Using the following lines I get the subsequent error.

(pid is a string value)
win32api.TerminateProcess(int(pid), 0)

OR

ctypes.windll.kernel32.TerminateProcess(int(pid), 0)

Errors:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python23\lib\lib-tk\Tkinter.py", line 1345, i
return self.func(*args)
File "vngconsole.py", line 27, in StopVngSvc
win32api.TerminateProcess(int(pid), 0)
error: (6, 'TerminateProcess', 'The handle is invalid.')

How exactly do I kill a pid using a string value?

.

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