[C++-sig] [python-win32] Python interpreter crashes after trying to callbacka python function with PyObject_CallObject from a dll
mhammond at skippinet.com.au
Thu Aug 11 00:45:59 CEST 2005
> static PyObject *my_callback = NULL;
> PyMODINIT_FUNC my_set_callback(PyObject *args)
> PyObject *temp = args;
> Py_XINCREF(temp); /* Add a reference to new callback */
> Py_XDECREF(my_callback); /* Dispose of previous callback */
> my_callback = temp; /* Remember new callback */
> bPyCallBackFlag = true;
That looks suspect:
* PyMODINIT_FUNC is probably not what you want - this is not a "module init"
* The first arg is always "self", with "args" being a second arg.
* You Py_INCREF(Py_None), but don't return it. I'm surprised that compiles.
Let's say "args" was NULL (as it probably will be - recall it is supposed to
be "self", which generally *will* be NULL. It should be obvious how that
would crash your code.
Also, note that even if you get the correct "args" pointer to that function,
it will be a tuple. Hence all code you will find uses PyArg_ParseTuple to
get the individual items out. Your callback will be the first item in the
> ppyobjResult = PyObject_CallObject(my_callback, ppyobjArgList);
This will fail for that reason - my_callback will *not* be a callable
I don't think either of the mailing lists you have sent this to are
appropriate - the problems are not releated to win32, not are they related
to C++. You really just need to look over the documentation on writing
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