Ok, I figured it out. I had two sets of python libs installed, via the Windows python installer and via vcpkg. I hope the following items might help someone: * the default python installation on Windows already comes with import libs and the dlls. * there is no need to built python with vcpkg not even for debug configuration * DONT set BOOST_DEBUG_PYTHON unless you want to debug python libs * Ideally, there is no need to set PYTHONHOME and PYTHONPATH environmental variables. Regards, Christian On Sat, Nov 18, 2017 at 11:52 AM, Christian Henning <chhenning@gmail.com> wrote:

Hi all,

On Windows 10 with Visual Studio 2017 I', trying to run the following code in x64 debug configuration:

#include <iostream>

#include <boost/python.hpp> #include <boost/python/numpy.hpp>

namespace p = boost::python; namespace np = boost::python::numpy;

int main() { Py_Initialize(); np::initialize();

p::tuple shape = p::make_tuple(3, 3); np::dtype dtype = np::dtype::get_builtin<float>(); np::ndarray a = np::zeros(shape, dtype);

return 0; }

In the line

np::initialize();

I'm getting a

Exception thrown at 0x0000000066E43B15 (python36.dll) in test.exe: 0xC0000005: Access violation reading location 0x0000000000000025. occurred

Inside boost::python::numpy::intialize() the exception is thrown when trying to execute the line:

PyObject *numpy = PyImport_ImportModule("numpy.core.multiarray");

Does anyone know why that would happen or how to debug the issue further?

I have installed all packages via pip and executed the python code as described in https://www.scipy.org/getting-started.html.

Thanks ahead! Christian