How do I call a function defined in C++ object from a python program?

Question

I have a C++ program:

class X
{
    private:
        int a;
    public:
        int func(char *str);
};

Now I want to call the function func in my Python program. How can I do it?

I have successfully called C functions from my Python program using ctypes. However I can't seem to figure out how to call functions defined inside C++ objects.

I have already worked with ctypes, so I would like to figure out how to accomplishing it that way. However I'm open to other techniques. Also my project puts a constarint that I am not supposed to use wrapper function in my C++ program.

Who thinks this is "not a real question"? Why?

Karl Knechtel
– Karl Knechtel

2012-04-11 07:51:43 +00:00
Commented Apr 11, 2012 at 7:51 — Karl Knechtel
– Karl Knechtel, Commented Apr 11, 2012 at 7:51

Karl Knechtel · Accepted Answer · 2012-04-11 06:19:58Z

2

Check out Boost::Python.

answered Apr 11, 2012 at 6:19

Karl Knechtel

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2 Comments

Sudip Over a year ago

thank you friend.. but I am not supposed to write wraaper functions which i will need to write in boost Python..

Karl Knechtel Over a year ago

"supposed to"? Isn't it your project?

David Heffernan · Accepted Answer · 2012-04-11 06:26:43Z

1

You tagged the question ctypes, but you cannot instantiate a C++ object directly from ctypes. You can wrap the C++ object in a C interface and then use ctypes. Or you could write a Python extension module which could include C++ code.

answered Apr 11, 2012 at 6:26

David Heffernan

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4 Comments

Sudip Over a year ago

You mean to say i first need to study writing python extension module(I am not supposed to use wrapper functions) to accomplish my task..

David Heffernan Over a year ago

Your question says nothing about these extra constraints you are adding in comments. Please can you correct the question.

Sudip Over a year ago

I have edited my question to include my constraint. Now, can you advice me on how to move forward.

David Heffernan Over a year ago

Your options are 1. Wrap the C++ code in a C style wrapper. 2. Write an extension module. SWIG and Boost.Python both make it easier for you to create an extension module.

HighCommander4 · Accepted Answer · 2012-04-11 06:20:59Z

0

An alternative to Boost.Python is SWIG.

answered Apr 11, 2012 at 6:20

HighCommander4

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Comments

xgwang · Accepted Answer · 2012-04-11 06:24:18Z

0

try http://swig.org/ years ago i wrapped some c/c++ code to use them in wxPython with swig. i cannot remember too much details but i think swig is easy to use.

Hope that helps.

answered Apr 11, 2012 at 6:24

xgwang

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