Calling C++ code from Python using Cython whith the distutilis approach

Question

I am trying to call a c++ code from a python script using cython. I already managed to work with an example from here but the thing is: my c++ code includes non-standard librari

Answer 1

Resolved, thanks to Dietmar Kühl's comments and this video from youtube!

What was wrong? I found out that my setup.py was misconfigured. It should be like:

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

setup(
    name = 'DyCppInterface',
    version = '1.0',
    author = 'Marcelo Salloum dos Santos',
    # The ext modules interface the cpp code with the python one:
    ext_modules=[
        Extension("rectangle",
            sources=["rectangle.pyx", "cpp_rect.cpp"], # Note, you can link against a c++ library instead of including the source
            include_dirs=[".","source" , "/opt/local/include/opencv", "/opt/local/include"],
            language="c++",
            library_dirs=['/opt/local/lib', 'source'],
            libraries=['opencv_core', 'LibCppOpenCV'])
    ],
    cmdclass = {'build_ext': build_ext},
)

The three things to pay attention in order to correctly configure it are:

• include_dirs: each referenced file in the setup.py or the .h and .cpp shall have its container folder in the include_dirs;
• library_dirs: each referenced library shall have its container folder written here;
• libraries: one MUST put the library's name here

Further questions on how to configure a library for cython can be answered by watching this video on how to use and configure a dynamic library (using Eclipse CDT).