How to print to Python terminal with Boost::Python

Question

I would like to do the equivalent of a print in python from a library I wrote in C++. I am using Boost 1.60.0 and Python 2.7.

I found the following sites :Mantid and WikiBooks. From what I understood this code should work, but nothing is printed.

cpp file

void greet()
{
    std::cout<<"test_01\n";
    std::cout<<"test_02"<<std::endl;
    printf("test_03");
}
BOOST_PYTHON_MODULE(PythonIntegration)
{
    def("greet", greet);
}

py file

import PythonIntegration
PythonIntegration.greet()

I checked if the function was called by making it return something and it works, but still nothing is printed.

Thank you for your help

LawfulEvil · Accepted Answer · 2016-03-15 20:09:46Z

2

This hello world example seems to do exactly what you want : https://en.wikibooks.org/wiki/Python_Programming/Extending_with_C%2B%2B

Basically...

C++

#include <iostream>

using namespace std;

void say_hello(const char* name) {
    cout << "Hello " <<  name << "!\n";
}

#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
using namespace boost::python;

BOOST_PYTHON_MODULE(hello)
{
    def("say_hello", say_hello);
}

Now, in setup.py

#!/usr/bin/env python

from distutils.core import setup
from distutils.extension import Extension

setup(name="PackageName",
    ext_modules=[
        Extension("hello", ["hellomodule.cpp"],
        libraries = ["boost_python"])
    ])

Now you can do this :

python setup.py build

Then at the python command prompt :

>>> import hello
>>> hello.say_hello("World")
Hello World!

edited Mar 15, 2016 at 20:09

answered Mar 15, 2016 at 19:49

LawfulEvil

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4 Comments

LawfulEvil Over a year ago

Quite right. Your example is very similar to the hello world example here... boost.org/doc/libs/1_55_0/libs/python/doc/tutorial/doc/html/…

LawfulEvil Over a year ago

You are not really concerned about it calling your function(which it is), you are more worried/concerned about redirecting c++'s stdout back into python and printing it from python?

LawfulEvil Over a year ago

See edits to my answer. Sorry about that first answer.

Heckel Over a year ago

I have seen this example but I don't know what to do with the setup.py. I'll look into it. Thank you.

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