ctypes error on exit of win32 application

I'm attempting to use ctypes on a DLL with the following
signature:

__declspec(dllimport) void process_record(char *, char *);

An example .cpp file has code like this:

int main(int argc, char **argv)
{
char record[100];
char code[6];
...
process_record(code, record);

When I invoke it under Python everything fine
while the interpreter is running:

>>> from ctypes import *
>>> record = create_string_buffer("My Record")
>>> code = create_string_buffer('\000' * 6)
>>> cdll.grouper.process_recode(code, record)
>>> print code.value
'9999'

But when the interpreter exits, either interactively
or from a script, the following Program Error popup
gets displayed:

"python.exe has generated errors and will be closed
by Windows. You will need to restart the program."

What can I do to prevent this error?
(Environment: Win2000, Python 2.5)
--
Jeff Bauer
Rubicon, Inc.

.

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