At Fri, 4 Feb 2011 14:08:11 +0000, Julian Bailey wrote:

Hi,

I am running through the basic examples on the boost website for embedding boost::python.

My code currently reads:

#include <iostream>

#include "./include/Python.h" #include "./boost/python.hpp"

using namespace boost::python;

int main(void) { Py_Initialize();

object main_module = import("__main__"); object main_namespace = main_module.attr("__dict__");

object ignored = exec("print Hello world",main_namespace);

return 0; }

The program links successfully and begins running, however an access violation occurs (NULL pointer) at the first line after "py_initialize();" when i call import("__main__");

Do you have a complete stack backtrace?

Visual studio 2010s debugger says the exception occurs at: line 74 in object_attributes.hpp:

inline object const_attribute_policies::get(object const& target, char const* key) { return python::getattr(target, key); }

Python was built using Visual studio 2010 so i had access to the python debug library.

Yeah, but you can't use the python debug library unless you are also passing python-debugging=on to your Boost build as described in http://www.boost.org/doc/libs/1_45_0/libs/python/doc/building.html#python-de... . Are you doing that? If not, a crash is to be expected.

Boost is version 1.45 and was built using :

bjam --build-type=complete msvc stage --with-python

I am linking against: boost_python-vc100-mt-gd-1_45.lib and boost_python-vc100-mt-gd-1_45.dll

I have looked for soutions on the internet and have found nothing right now. Can anyone help me?

note: i am building my application in MSVC 2010, this should work though shouldn't it?

It should. -- Dave Abrahams BoostPro Computing http://www.boostpro.com