Mailman 3 May 2013 - Cplusplus-sig

boost::python embedding error - runtime - Mac OS X - 1.38
by Igor Karpov Oct. 1, 2014

Oct. 1, 2014

Hi, I am trying to run the following program: #include <iostream> #include <Python.h> #include <boost/python.hpp> using namespace boost::python; using namespace std; int main(int argc, char** argv) { { // Using Python/C Py_Initialize(); PyObject* main_module = PyImport_ImportModule("__main__"); PyObject* globals = PyEval_GetGlobals(); PyObject* locals = PyEval_GetLocals(); PyRun_SimpleString("print 'Hello World, from Python/C!'\n"); Py_Finalize(); } { // Using boost::python Py_Initialize(); object main_module = import("__main__"); object main_namespace = main_module.attr("__dict__"); try { object ignored = exec("print 'Hello World, from boost::python!'\n", main_namespace); Py_Finalize(); } catch (error_already_set const& e) { PyErr_Print(); return 1; } } return 0; } on Linux (both x86 and x86_64), with Ubuntu's default version of Boost (1.34.1) installed, I am able to do so as expected: $ ./embed Hello World, from Python/C! Hello World, from boost::python! on Mac OS X, I get a runtime error: $ ./embed Hello World, from Python/C! Bus Error Running with gdb, this is the stack trace: Hello World, from Python/C! Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x00000000 0x00000000 in ?? () (gdb) where #0 0x00000000 in ?? () #1 0x00bb618f in PyEval_GetGlobals () #2 0x00bce0dd in PyImport_Import () #3 0x00bce2b0 in PyImport_ImportModule () #4 0x008127d4 in boost::python::import (name=@0xbffff4a8) at libs/python/src/import.cpp:20 #5 0x00004446 in main (argc=1, argv=0xbffff510) at embed.cc:22 For this Mac, boost version is latest (1.38) and python version is: Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27) [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin Is this a bug? I attached the source and the cmake file I am using to build, for convenience. Thanks, --Igor.

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sendkeys method
by sam Sept. 30, 2013

Sept. 30, 2013

Hello, Is there away(method) in C/C++ programming that make the software think that someone pressed the OK button, similar to sendkeys in VBS (WshShell.SendKeys ("{Enter}")) Thank you, Sam

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Undefined symbols for architecture x86_64 - Building boost 1.52 with Python 3.3 on MacOSX
by Simon W May 24, 2013

May 24, 2013

Hello, I need som help. I'm building boost on my Mac OSX 10.8 using the bjam build system. I have installed Python 3.3 seperatly aas it doesn't ship with the Mac. So I have my project-config.jam file like: # Boost.Build Configuration # Automatically generated by bootstrap.sh import option ; import feature ; if ! darwin in [ feature.values <toolset> ] { using darwin ; } project : default-build <toolset>darwin ; # Python configuration using python : 3.3 : /Library/Frameworks/Python.framework/Versions/3.3 : /Library/Frameworks/Python.framework/Versions/3.3/Headers : /Library/Frameworks/Python.framework/Versions/3.3/lib ; libraries = --with-python ; option.set prefix : /usr/local ; option.set exec-prefix : /usr/local ; option.set libdir : /usr/local/lib ; option.set includedir : /usr/local/include ; # Stop on first error option.set keep-going : false ; I'm not used to Mac but I think it compiles but during linking I get the following error: Undefined symbols for architecture x86_64: "_PyInt_AsLong", referenced from: boost::python::detail::list_base::count(boost::python::api::object const&) constin list.o boost::python::detail::list_base::index(boost::python::api::object const&) constin list.o boost::python::detail::list_base::insert(boost::python::api::object const&, boost::python::api::object const&)in list.o "_PyInt_FromLong", referenced from: boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, boost::python::api::object, long>(_object*, boost::python::api::object const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, long>(_object*, long const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, long, long>(_object*, long const&, long const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long>(_object*, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::list_base::pop(long)in list.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, boost::python::api::object>(_object*, long const&, boost::python::api::object const&, boost::type<boost::python::api::object>*)in list.o "_PyString_FromStringAndSize", referenced from: boost::python::numeric::(anonymous namespace)::load(bool)in numeric.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status What is wrong? Thanks, Simon

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Type converter not found for property
by Wichert Akkerman May 10, 2013

May 10, 2013

I am trying to expose a class with a boost::uuids::uuid member to Python. The class is pretty simple: class Article { public: boost::uuids::uuid uuid; }; which is exposed like this: article .def(init<boost::uuids::uuid, Article::Type>((arg("uuid"))) .def_readwrite("uuid", &Article::uuid); and I have basic converter registered (see https://gist.github.com/wichert/5543390 , it is a bit large to include in this email). This compiles fine and the uuid convertor works correctly when trying converting from python to C++, but trying to access the uuid property results in "TypeError: No Python class registered for C++ class boost::uuids::uuid". I don't understand why that doesn't work; does anyone see what I missed? Wichert.

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boost::python::extract and boost::variant
by Bryan Catanzaro May 7, 2013

May 7, 2013

Hi - Using Boost 1.53.0, the following code fails to compile with g++, when c++11 is enabled: #include <boost/python.hpp> #include <boost/variant.hpp> struct A{}; struct B{}; typedef boost::variant<A, B> my_variant; void foo(boost::python::object o) { my_variant v = boost::python::extract<my_variant>(o); } The error is: /home/bcatanzaro/boost_1_53_0/boost/variant/variant.hpp:1574:9: error: no matching function for call to ‘boost::variant<A, B>::initializer::initialize(void*, std::remove_reference<boost::python::extract<boost::variant<A, B> >&>::type)’ Looking at the relevant line in boost/variant/variant.hpp, it looks like variant is attempting to convert the boost::python::extract<my_variant> object into either A or B, and failing to find a conversion. Since this code compiles when c++11 is not enabled, it appears rvalue references coupled with boost::python::extract are confusing boost::variant's constructor selection; I would expect it should be copy constructing from variant<A, B>, rather than convert constructing into A or B. Any advice or workarounds? Turning off c++11 is difficult, since the whole project relies on it. The code compiles correctly with c++11 turned on with Boost 1.48.0, so it appears something has regressed. Thanks, bryan

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boost::variant and boost::python::extract
by Bryan Catanzaro May 7, 2013

May 7, 2013

Hi - Using Boost 1.53.0, the following code fails to compile with g++, when c++11 is enabled: #include <boost/python.hpp> #include <boost/variant.hpp> struct A{}; struct B{}; typedef boost::variant<A, B> my_variant; void foo(boost::python::object o) { my_variant v = boost::python::extract<my_variant>(o); } The error is: /home/bcatanzaro/boost_1_53_0/boost/variant/variant.hpp:1574:9: error: no matching function for call to ‘boost::variant<A, B>::initializer::initialize(void*, std::remove_reference<boost::python::extract<boost::variant<A, B> >&>::type)’ Looking at the relevant line in boost/variant/variant.hpp, it looks like variant is attempting to convert the boost::python::extract<my_variant> object into either A or B, and failing to find a conversion. Since this code compiles when c++11 is not enabled, it appears rvalue references coupled with boost::python::extract are confusing boost::variant's constructor selection; I would expect it should be copy constructing from the same variant, rather than convert constructing. Any advice or workarounds? Turning off c++11 is difficult, since the whole project relies on it. The code compiles correctly with c++11 turned on with Boost 1.48.0, so it appears something has regressed. Thanks, bryan

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pygccxml
by Kostyrka (External user) Andreas May 3, 2013

May 3, 2013

Hi! I just wondered where the authorative repository for pygccxml/pyplusplus are? The sf.net ones seem to lack commits for rather long periods of time. TIA, AndreasThe information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.

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Biggest Fake Conference in Computer Science
by eliswilson＠hushmail.com May 3, 2013

May 3, 2013

Biggest Fake Conference in Computer Science We are researchers from different parts of the world and conducted a study on the world’s biggest bogus computer science conference WORLDCOMP http://sites.google.com/site/worlddump1 organized by Prof. Hamid Arabnia from University of Georgia, USA. We submitted a fake paper to WORLDCOMP 2011 and again (the same paper with a modified title) to WORLDCOMP 2012. This paper had numerous fundamental mistakes. Sample statements from that paper include: (1). Binary logic is fuzzy logic and vice versa (2). Pascal developed fuzzy logic (3). Object oriented languages do not exhibit any polymorphism or inheritance (4). TCP and IP are synonyms and are part of OSI model (5). Distributed systems deal with only one computer (6). Laptop is an example for a super computer (7). Operating system is an example for computer hardware Also, our paper did not express any conceptual meaning. However, it was accepted both the times without any modifications (and without any reviews) and we were invited to submit the final paper and a payment of $500+ fee to present the paper. We decided to use the fee for better purposes than making Prof. Hamid Arabnia richer. After that, we received few reminders from WORLDCOMP to pay the fee but we never responded. This fake paper is different from the two fake papers already published (see https://sites.google.com/site/worlddump4 for details) in WORLDCOMP. We MUST say that you should look at the above website if you have any thoughts of participating in WORLDCOMP. DBLP and other indexing agencies have stopped indexing WORLDCOMP’s proceedings since 2011 due to its fakeness. See http://www.informatik.uni-trier.de/~ley/db/conf/icai/index.html for of one of the conferences of WORLDCOMP and notice that there is no listing after 2010. See Section 2 of http://sites.google.com/site/dumpconf for comments from well-known researchers about WORLDCOMP. The status of your WORLDCOMP papers can be changed from scientific to other (i.e., junk or non-technical) at any time. Better not to have a paper than having it in WORLDCOMP and spoil the resume and peace of mind forever! Our study revealed that WORLDCOMP is money making business, using University of Georgia mask, for Prof. Hamid Arabnia. He is throwing out a small chunk of that money (around 20 dollars per paper published in WORLDCOMP’s proceedings) to his puppet (Mr. Ashu Solo or A.M.G. Solo) who publicizes WORLDCOMP and also defends it at various forums, using fake/anonymous names. The puppet uses fake names and defames other conferences to divert traffic to WORLDCOMP. He also makes anonymous phone calls and threatens the critiques of WORLDCOMP (See Item 7 of Section 5 of above website). That is, the puppet does all his best to get a maximum number of papers published at WORLDCOMP to get more money into his (and Prof. Hamid Arabnia’s) pockets. Prof. Hamid Arabnia makes a lot of tricks. For example, he appeared in a newspaper to fool the public, claiming him a victim of cyber-attack (see Item 8 in Section 5 of above website). Monte Carlo Resort (the venue of WORLDCOMP for more than 10 years, until 2012) has refused to provide the venue for WORLDCOMP’13 because of the fears of their image being tarnished due to WORLDCOMP’s fraudulent activities. That is why WORLDCOMP’13 is taking place at a different resort. WORLDCOMP will not be held after 2013. The draft paper submission deadline is over but still there are no committee members, no reviewers, and there is no conference Chairman. The only contact details available on WORLDCOMP’s website is just an email address! We ask Prof. Hamid Arabnia to publish all reviews for all the papers (after blocking identifiable details) since 2000 conference. Reveal the names and affiliations of all the reviewers (for each year) and how many papers each reviewer had reviewed on average. We also ask him to look at the Open Challenge (Section 6) at https://sites.google.com/site/moneycomp1 and respond if he has any professional values. Sorry for posting to multiple lists. Spreading the word is the only way to stop this bogus conference. Please forward this message to other mailing lists and people. We are shocked with Prof. Hamid Arabnia and his puppet’s activities at http://worldcomp-fake-bogus.blogspot.com Search Google using the keyword worldcomp fake for additional links.

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