发送自魅族手机 -------- 原始邮件 -------- 发件人：cplusplus-sig-requ...@python.org 时间：周日 8月31日 18:03 收件人：cplusplus-sig@python.org 主题：Cplusplus-sig Digest, Vol 70, Issue 5 >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. Boost python extract on Mac OS Mavericks - seg fault > (Brian Bruggeman) > 2. Re: Boost python extract on Mac OS Mavericks - seg fault > (Stefan Seefeld) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Thu, 28 Aug 2014 17:19:07 -0500 >From: Brian Bruggeman <brian.m.brugge...@gmail.com> >To: cplusplus-sig@python.org >Subject: [C++-sig] Boost python extract on Mac OS Mavericks - seg > fault >Message-ID: <67dfd8de-af5f-4f17-ad71-093eea66c...@gmail.com> >Content-Type: text/plain; charset="windows-1252" > >Hi all, > >I am having trouble with a really simple example, and I am hoping someone on >this list can help me. > >I have created a github repo for code in question: > > git clone g...@github.com:brianbruggeman/boost_python_hello_world.git > >I have also created a stack overflow question: > > http://stackoverflow.com/q/25533329/631199 > >The basic problem is as follows: > > Currently, I am able to compile cleanly, but when executing the code, I > receive a segmentation fault. I've narrowed the seg-fault down to the line > which actually uses boost::python::extract. > >Code: > > #include <boost/python.hpp> > #include <iostream> > > namespace bp = boost::python; > > // Embedding python > int main(int argc, char** argv) { > int data = 0; > Py_Initialize(); > PyRun_SimpleString("data = 1"); > bp::object > module(bp::handle<>(bp::borrowed(PyImport_AddModule("__main__")))); > bp::object dictionary = module.attr("__dict__"); > bp::object data_obj = dictionary["data"]; > // Error: The following line has the segmentation fault... > data = bp::extract<int>(data_obj); > std::cout << "data = " << data << std::endl; > Py_Finalize(); > return 0; > } > >CMakeLists.txt: > > project(hello) > cmake_minimum_required(VERSION 2.8) > > FIND_PACKAGE(PythonInterp) > FIND_PACKAGE(PythonLibs) > FIND_PACKAGE(Boost COMPONENTS python) > > include_directories(${PYTHON_INCLUDE_DIRS} ${Boost_INCLUD_DIRS}) > link_directories(${PYTHON_LIBRARY_DIRS} ${Boost_LIBRARY_DIRS}) > > add_executable(hello say_hello.cpp) > target_link_libraries(hello > ${Boost_LIBRARIES} > ${PYTHON_LIBRARIES}) > >Also for completeness? > >I installed Python and Boost::Python using the following? > > brew install python > brew install boost ?with-python > >Thanks so much in advance! > >Brian >-------------- next part -------------- >An HTML attachment was scrubbed... >URL: ><http://mail.python.org/pipermail/cplusplus-sig/attachments/20140828/806de42f/attachment-0001.html> > >------------------------------ > >Message: 2 >Date: Sat, 30 Aug 2014 09:38:06 -0400 >From: Stefan Seefeld <ste...@seefeld.name> >To: cplusplus-sig@python.org >Subject: Re: [C++-sig] Boost python extract on Mac OS Mavericks - seg > fault >Message-ID: <5401d3be.9030...@seefeld.name> >Content-Type: text/plain; charset=windows-1252 > >On 08/28/2014 06:19 PM, Brian Bruggeman wrote: >> Hi all, >> >> I am having trouble with a really simple example, and I am hoping >> someone on this list can help me. >> >> I have created a github repo for code in question: >> >> git clone g...@github.com:brianbruggeman/boost_python_hello_world.git >> >> I have also created a stack overflow question: >> >> http://stackoverflow.com/q/25533329/631199 >> >> The basic problem is as follows: >> >> Currently, I am able to compile cleanly, but when executing the code, >> I receive a segmentation fault. I've narrowed the seg-fault down to >> the line which actually uses boost::python::extract. > >As a first step I suggest wrapping the code in a try-block, to catch >Python exceptions. You may also try extract::check() to verify whether >the object can in fact be converted to the specified type. (In your >version a conversion failure would result in an exception.) >I would also rewrite the code to use more of the Boost.Python API >(import, exec, etc.) > >All that being said, the code compiles and runs fine for me (Fedora 20), >and I don't see anything wrong. > >Regards, >Stefan > > > > > >> >> Code: >> >> #include <boost/python.hpp> >> #include <iostream> >> >> namespace bp = boost::python; >> >> // Embedding python >> int main(int argc, char** argv) { >> int data = 0; >> Py_Initialize(); >> PyRun_SimpleString("data = 1"); >> bp::object >> module(bp::handle<>(bp::borrowed(PyImport_AddModule("__main__")))); >> bp::object dictionary = module.attr("__dict__"); >> bp::object data_obj = dictionary["data"]; >> // Error: The following line has the segmentation fault... >> data = bp::extract<int>(data_obj); >> std::cout << "data = " << data << std::endl; >> Py_Finalize(); >> return 0; >> } >> >> CMakeLists.txt: >> >> project(hello) >> cmake_minimum_required(VERSION 2.8) >> >> FIND_PACKAGE(PythonInterp) >> FIND_PACKAGE(PythonLibs) >> FIND_PACKAGE(Boost COMPONENTS python) >> >> include_directories(${PYTHON_INCLUDE_DIRS} ${Boost_INCLUD_DIRS}) >> link_directories(${PYTHON_LIBRARY_DIRS} ${Boost_LIBRARY_DIRS}) >> >> add_executable(hello say_hello.cpp) >> target_link_libraries(hello >> ${Boost_LIBRARIES} >> ${PYTHON_LIBRARIES}) >> >> Also for completeness? >> >> I installed Python and Boost::Python using the following? >> >> brew install python >> brew install boost ?with-python >> >> Thanks so much in advance! >> >> Brian >> >> >> _______________________________________________ >> Cplusplus-sig mailing list >> Cplusplus-sig@python.org >> https://mail.python.org/mailman/listinfo/cplusplus-sig > > >-- > > ...ich hab' noch einen Koffer in Berlin... > > > >------------------------------ > >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 70, Issue 5 >********************************************
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