pyarg_parsetuple crashes python

Asked Jan 07 '15 at 12:49

Active Jan 07 '15 at 13:50

Viewed 215 times

I'm trying to parse a boolean and an optional unicode string (which should be set only if the boolean is True).

PyObject *pBool, *pStr;

PyArg_ParseTuple(args, "O!|u", &PyBool_Type, pBool, pStr);

When I call my function like that: func(True, u'str'); func(False);

My code crashes.

What am I doing wrong?

edited Jan 07 '15 at 13:50

asked Jan 07 '15 at 12:49

John Doe

Isn't the first argument to [`PyArg_ParseTuple`](https://docs.python.org/2/c-api/arg.html#c.PyArg_ParseTuple) is `PyObject *args`? – Ashwini Chaudhary Jan 07 '15 at 12:59
Yes, but it's not the issue. – John Doe Jan 07 '15 at 13:10
1

Do you get a stack trace? – thegrinner Jan 07 '15 at 13:13
Shouldn't there be the *addresses* of `pBool` & `pStr`? Can you show their declarations otherwise? – Jan 07 '15 at 13:21
That may be the problem: you'll still need the address of the `PyObject *`s. So keep the same declaration, but use the address-of operator in `PyArg_ParseTuple` for `pBool` and `pStr`. – Jan 07 '15 at 13:54
You may also want to set a default for `pStr`, since it's optional. – Jan 07 '15 at 13:55

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