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POC++ Boost.Python : 2 problems
 

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  1. POC++ Boost.Python : 2 problems
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    <p>So, i search good tool to integrate my C++ code with python, and at first i looked at boost.python.</p> <p>I've get hello examle from boost documentation and try to build and run it. Source code is (src/hello.cpp):</p> <pre><code>#include &lt;Python.h&gt; #include &lt;boost/python.hpp&gt; char const* greet() { return "hello, world"; } BOOST_PYTHON_MODULE(hello_ext) { using namespace boost::python; def("greet", greet); } </code></pre> <p><strong>Problem 1 - Windows and mingw</strong></p> <p>I try to build and my result :</p> <pre><code>g++ -o build\hello.o -c -IE:\Programming\libs\boost_1_48_0 -IE:\Programming\Python\include src\hello.cpp g++ -shared -o pyhello.dll build\hello.o -LE:\Programming\libs\boost_1_48_0\stage\lib -LE:\Programming\Python\libs -lboost_python-mgw45-mt-1_48 -lpython27 -Wl,--out-implib,libpyhello.a Creating library file: libpyhello.a build\hello.o:hello.cpp:(.text+0x20): undefined reference to `_imp___ZN5boost6python6detail11init_moduleEPKcPFvvE' </code></pre> <p>Also similar 4 undefined errors with boost::python.</p> <p>My build boost command line : <code>bjam toolset=gcc variant=release</code></p> <p>I found similar troubles in google (and on stackoverflow too), but didn't found answer at my case.</p> <p><strong>Problem 2 - Using module (linux)</strong></p> <p>At linux platform i've no problem with building module, same source compiled well :</p> <pre><code>g++ -o build/hello.os -c -fPIC -I/usr/include/python2.7 src/hello.cpp g++ -o libpyhello.so -shared build/hello.os -lboost_python -lpython2.7 </code></pre> <p>Now, how can i use that? In documentation no words about module naming, quote :</p> <blockquote> <p>can be exposed to Python by writing a Boost.Python wrapper:</p> <pre><code>#include &lt;boost/python.hpp&gt; BOOST_PYTHON_MODULE(hello_ext) { using namespace boost::python; def("greet", greet); } </code></pre> <p>That's it. We're done. We can now build this as a shared library. The resulting DLL is now visible to Python. Here's a sample Python session:</p> <pre><code>&gt;&gt;&gt; import hello_ext &gt;&gt;&gt; print hello_ext.greet() hello, world </code></pre> </blockquote> <p>So, my module named: libpyhello.so, but how i can use it in python iterpreter? I try import pyhello, hello_ext, libpyhello - and only with libpyhello interpreter is printed :</p> <pre><code>ImportError: dynamic module does not define init function (initlibpyhello) </code></pre> <p>All other variants of import failed with : <code>ImportError: No module named pyhello</code></p> <p><strong>UPDATE 2nd question</strong> : Solved, *.so module must be named as ID used in BOOST_PYTHON_MODULE. After i change : <code>BOOST_PYTHON_MODULE(hello_ext)</code> to <code>BOOST_PYTHON_MODULE(libpyhello)</code>, module is imported well as libpyhello.</p>
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