CODEWITHSUNDEEP
c++makefileboost-python
Saeed
Saeed

Reputation: 159

error while compiling a c++ code which is called inside of a python code, with boost python

I started a project in Python and I want to work with some image objects. I want to call some C++ functions in my Python's code. After some research, I decided to use the Python Boost library to call a C++ function in my Python code.

My Boost version is : libboost_python3-py36.so.1.65.1. and I am using Python v3.6.

I wrote my C++ code like this in my CppProject.cpp:


char const* myMethod() {
    // do some operations ...


    return "It is Done";
}

#include <boost/python.hpp>

BOOST_PYTHON_MODULE(CppProject) {
    boost::python::def("getTryString", myMethod); // boost::python is the namespace
}

also, I created my CMakeLists.txt like this:

cmake_minimum_required(VERSION 2.8.3)
FIND_PACKAGE(PythonInterp)
FIND_PACKAGE(PythonLibs)
FIND_PACKAGE(Boost COMPONENTS python)

INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS})

PYTHON_ADD_MODULE(NativeLib CppProject)
FILE(COPY MyProject.py DESTINATION .) # See the whole tutorial to understand this line

and finally, this is my Python code in MyProject.py:

import NativeLib
# some preprocess
print (NativeLib.getTryString)

After writing the code, I created a directory with the name build. and in that directory, I ran this command:

cmake -DCMAKE_BUILD_TYPE=Release ..

After that and before I run my Python code, I did make it and finally, I ran my python's code but segmentation fault occurred!

Could someone help me with solving this error?

Upvotes: 0

Views: 91

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409176

The compiler needs all symbols you use in your program to be declared before you use them. If you use a symbol which have't been declared it will give you an error because it doesn't know about it.

Now when you use BOOST_PYTHON_MODULE, that symbol is unknown by the compiler, and the whole statement is therefore syntactically wrong.

You must include the Boost header files that defines the BOOST_PYTHON_MODULE macro, as well as boost::python::def.

Upvotes: 1

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