Hello World Python Extension in C++ Using Boost

hello world python extension in c++ using boost?

/usr/include/boost/python/detail/wrap_python.hpp:50:23:
fatal error: pyconfig.h: No such file
or directory compilation terminated.

This line tells exactly why it doesn't work. Your compiler doesn't know where is the pyconfig.h file. You have two options here:

1. place pyconfig.h in a location that
   g++ knows about (i.e. your
   project's directory)
2. add -I DIRECTORY (this is capital i,
   not lowercase L) flag to g++ that
   will make g++ search DIRECTORY for header files

g++ -I /path/to/my/include/files main.cpp

Boost Python Hello World example not working in Python

AFAIK you have to change the extension of the DLL to .pyd or otherwise Python will not be able to load it. I think you can set a build option to automatically set the extension in VS, but I don't know for sure.

Also, make sure that the created extension is somewhere on the PYTHONPATH, the path, python will look for modules to load.

manually building a python extension in cygwin with boost.python

ThatImportError is generally not Boost.Python related. Rather, it normally indicates that xyz is not in the Python Module Search Path.

To debug this, consider running python with -vv arguments. This will cause python to print a message for each file that is checked for when trying to import xyz. Regardless, the build process look correct, so the problem is likely the result of either the file extension or the module is not in the search path.

I am unsure as to how Cygwin will interact with Python's run-time loading behavior. However:

• On Windows, python extensions have a .pyd extension.
• On Linux, python extensions have a .so extension.

Additionally, verify that the xyz library is located in one of the following:

• The directory containing the test.py script (or the current directory).
• A directory listed in the PYTHONPATH environment variable.
• The installation-dependent default directory.

If the unresolved library shown in ldd causes errors, it will generally manifest as an ImportError with a message indicating undefined references.

Hello world with boost python and python 3.2

Although this discussion old, just for the record:
Modify project-config.jam to change the python version to your setup

# Python configuration
using python : 3.4 : /usr ;

Then build boost:

./b2 clean
./b2 --with-python link=static cxxflags="-std=c++11 -fPIC" variant=release stage
./b2 --with-python link=static cxxflags="-std=c++11 -fPIC" variant=release install

The later command requires super user privileges. Then move to the folder containing C++ code for the extension:

g++ -std=c++11 hellopy.cpp -I/usr/include/python3.4 -I/usr/local/include/boost/python -lboost_python3  -o hello.so -shared -fPIC

You can then import hello into your python environment.

Calling C++ from python using boost python: introductory example not working

You should include some libraries in your link command,

 g++ -shared -Wl,--no-undefined hello_ext.o -lboost_python -lpython2.7 -o hello_ext.so

With -Wl,--no-undefined linker option it will be an error if some symbols are missing.

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