The problem doesn't have anything to do with boost.python. The thing is in initializing numpy API pointer specifically PyArray_API*. If you print this pointer before creating the array, it'll turn out to be null. If you move import_array function just before the array creation call, it should work. You can find more details here http://docs.scipy.org/doc/numpy/reference/c-api.array.html in Miscellaneous section at the bottom.
Regards, Alexandra > 05 авг. 2016 г., в 20:00, cplusplus-sig-requ...@python.org написал(а): > > Send Cplusplus-sig mailing list submissions to > cplusplus-sig@python.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.python.org/mailman/listinfo/cplusplus-sig > or, via email, send a message with subject or body 'help' to > cplusplus-sig-requ...@python.org > > You can reach the person managing the list at > cplusplus-sig-ow...@python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Cplusplus-sig digest..." > > > Today's Topics: > > 1. Segmentation Fault (core dumped) on Python 3.5.2 but not > Python 2.7.12 (Matthew Conte) > 2. Re: Segmentation Fault (core dumped) on Python 3.5.2 but not > Python 2.7.12 (Stefan Seefeld) > 3. Re: Segmentation Fault (core dumped) on Python 3.5.2 but not > Python 2.7.12 (Matthew Conte) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 4 Aug 2016 13:10:23 -0400 > From: Matthew Conte <matt.p.co...@gmail.com> > To: cplusplus-sig@python.org > Subject: [C++-sig] Segmentation Fault (core dumped) on Python 3.5.2 > but not Python 2.7.12 > Message-ID: > <CAFwmYYjxXXVQV=6wv8x_q4uc2gjogr1or_jsurhp3kcmreb...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > So I'm trying to create a boost python module that simply creates and > returns a numpy array, > but the function crashes (sometimes) and it doesn't ever seem to crash on > Python 2. > > Here's the source code I made: > > #include <boost/python.hpp> > #include <numpy/ndarrayobject.h> > > using namespace boost::python; > > object create_numpy_array() { > npy_intp dims = 1; > long* data = new long[1]; > data[0] = 1; > PyObject* obj = PyArray_SimpleNewFromData(1, &dims, PyArray_LONGLTR, data); > boost::python::handle<> handle(obj); > boost::python::numeric::array arr(handle); > return arr.copy(); > } > > BOOST_PYTHON_MODULE(create) { > import_array(); > numeric::array::set_module_and_type("numpy", "ndarray"); > def("numpy_array", &create_numpy_array); > } > > > using a simple python script to test: > > import create > print(create.numpy_array()) > > > The stack trace indicates that the crash occurs on a boost::python::handle > destructor trying to decrease the ref count of a PyObject with a ref count > of 0. > > I've tried this on both Windows 7 and Ubuntu 16.04 both 64-bit. > > Thank you. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://mail.python.org/pipermail/cplusplus-sig/attachments/20160804/2ad0a9ec/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Thu, 4 Aug 2016 13:14:58 -0400 > From: Stefan Seefeld <ste...@seefeld.name> > To: cplusplus-sig@python.org > Subject: Re: [C++-sig] Segmentation Fault (core dumped) on Python > 3.5.2 but not Python 2.7.12 > Message-ID: <32f9c08d-2d65-c1b5-ca1a-1055f3784...@seefeld.name> > Content-Type: text/plain; charset=windows-1252 > > Hi Matthew, > > would you mind submitting an issue on > https://github.com/boostorg/python/issues for this. > > Thanks, > Stefan > >> On 04.08.2016 13:10, Matthew Conte wrote: >> So I'm trying to create a boost python module that simply creates and >> returns a numpy array, >> but the function crashes (sometimes) and it doesn't ever seem to crash >> on Python 2. >> >> Here's the source code I made: >> >> #include <boost/python.hpp> >> #include <numpy/ndarrayobject.h> >> >> using namespace boost::python; >> >> object create_numpy_array() { >> npy_intp dims = 1; >> long* data = new long[1]; >> data[0] = 1; >> PyObject* obj = PyArray_SimpleNewFromData(1, &dims, PyArray_LONGLTR, >> data); >> boost::python::handle<> handle(obj); >> boost::python::numeric::array arr(handle); >> return arr.copy(); >> } >> >> BOOST_PYTHON_MODULE(create) { >> import_array(); >> numeric::array::set_module_and_type("numpy", "ndarray"); >> def("numpy_array", &create_numpy_array); >> } >> >> >> using a simple python script to test: >> >> import create >> print(create.numpy_array()) >> >> >> The stack trace indicates that the crash occurs on a >> boost::python::handle destructor trying to decrease the ref count of a >> PyObject with a ref count of 0. >> >> I've tried this on both Windows 7 and Ubuntu 16.04 both 64-bit. >> >> Thank you. >> >> >> _______________________________________________ >> Cplusplus-sig mailing list >> Cplusplus-sig@python.org >> https://mail.python.org/mailman/listinfo/cplusplus-sig > > > -- > > ...ich hab' noch einen Koffer in Berlin... > > > > ------------------------------ > > Message: 3 > Date: Thu, 4 Aug 2016 13:16:58 -0400 > From: Matthew Conte <matt.p.co...@gmail.com> > To: "Development of Python/C++ integration" <cplusplus-sig@python.org> > Subject: Re: [C++-sig] Segmentation Fault (core dumped) on Python > 3.5.2 but not Python 2.7.12 > Message-ID: > <cafwmyyjn4cdp4slas0c4jacfhpoxledypx+lospv4ndgvfh...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > I will, thank you. > >> On Thu, Aug 4, 2016 at 1:14 PM, Stefan Seefeld <ste...@seefeld.name> wrote: >> >> Hi Matthew, >> >> would you mind submitting an issue on >> https://github.com/boostorg/python/issues for this. >> >> Thanks, >> Stefan >> >>> On 04.08.2016 13:10, Matthew Conte wrote: >>> So I'm trying to create a boost python module that simply creates and >>> returns a numpy array, >>> but the function crashes (sometimes) and it doesn't ever seem to crash >>> on Python 2. >>> >>> Here's the source code I made: >>> >>> #include <boost/python.hpp> >>> #include <numpy/ndarrayobject.h> >>> >>> using namespace boost::python; >>> >>> object create_numpy_array() { >>> npy_intp dims = 1; >>> long* data = new long[1]; >>> data[0] = 1; >>> PyObject* obj = PyArray_SimpleNewFromData(1, &dims, PyArray_LONGLTR, >>> data); >>> boost::python::handle<> handle(obj); >>> boost::python::numeric::array arr(handle); >>> return arr.copy(); >>> } >>> >>> BOOST_PYTHON_MODULE(create) { >>> import_array(); >>> numeric::array::set_module_and_type("numpy", "ndarray"); >>> def("numpy_array", &create_numpy_array); >>> } >>> >>> >>> using a simple python script to test: >>> >>> import create >>> print(create.numpy_array()) >>> >>> >>> The stack trace indicates that the crash occurs on a >>> boost::python::handle destructor trying to decrease the ref count of a >>> PyObject with a ref count of 0. >>> >>> I've tried this on both Windows 7 and Ubuntu 16.04 both 64-bit. >>> >>> Thank you. >>> >>> >>> _______________________________________________ >>> Cplusplus-sig mailing list >>> Cplusplus-sig@python.org >>> https://mail.python.org/mailman/listinfo/cplusplus-sig >> >> >> -- >> >> ...ich hab' noch einen Koffer in Berlin... >> >> _______________________________________________ >> Cplusplus-sig mailing list >> Cplusplus-sig@python.org >> https://mail.python.org/mailman/listinfo/cplusplus-sig > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://mail.python.org/pipermail/cplusplus-sig/attachments/20160804/b50c011c/attachment-0001.html> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > https://mail.python.org/mailman/listinfo/cplusplus-sig > > ------------------------------ > > End of Cplusplus-sig Digest, Vol 94, Issue 2 > ********************************************
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