En Mon, 01 Feb 2010 18:21:56 -0300, Paul <goblado...@gmail.com> escribió:
I'm extending some old Visual Studio 6 code to add embedded python
scripting. It works fine most of the time but some python function calls
do
not work as expected.
The C++ code is a multithreaded MFC application. I was assuming that it
was
GIL issues but I have tried using the manual locking (PyEval_SaveThread &
PyEval_RestoreThread) and what seems to be the current method
(PyGILState_Ensure & PyGILState_Release)
Here's the error I'm getting:
Traceback (most recent call last):
File "...scripts\receipt_parser.py", line 296, in
get_giftcard_purchase_value
details = extract_transaction_details_section(test)
File "...scripts\receipt_parser.py", line 204, in
extract_transaction_details_section
for line in base_details:
TypeError: expected string or Unicode object, NoneType found
base_details is a list of strings (I can just define it like
'base_details=["1","2","3"...]' on the line previous) and the code runs
fine
when run from standard interpreter. Many other function calls work fine
from
the embedded app.
I create and then Py_DECREF the function parameters and the return value
after each function call. The module import is created at C++ object
constructor and then Py_DECREF'd in the desctuctor
Usually, errors in reference count handling prevent objects from being
destroyed (a memory leak) or generate a GPF when accessing an
now-inexistent object. In principle I'd look elsewhere.
Anyone else had issues of this kind?
Hard to tell without more info. base_details is built in C++ code? Is it
actually a list, or a subclass defined by you?
A common error is to forget to check *every* API function call for errors,
so errors get unnoticed for a while but are reported on the next check,
which may happen in an entirely unrelated function.
My next try will be to use
sub-interpreters per thread.
I would not do that - I'd try to *simplify* the code to test, not make it
more complicated.
Does it work in a single-threaded application?
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
