Re: [Swig-user] Printing std:string & return param in python

[Tomas W. <Tom...@hi...>]

>From SWIG docs on std_string.i:

"This module only supports types std::string and const std::string &. Pointers and non-const references are left unmodified and returned as SWIG pointers."

I.e. if you change the C++ function so that it returns by const reference or by value you will end up getting a Python string object. This is a very good idea anyway since strings are supposed to be immutable in Python.

/Tomas W.

________________________________________
Från: Ajay Kumar Todimala [aja...@gm...]
Skickat: den 14 januari 2011 04:53
Till: swi...@li...
Ämne: [Swig-user] Printing std:string & return param in python

Folks,

I have C++ function that I wrap in python using swig.

The following is the function.

std::string& GetText(strval aIndex) {
      return blocks[aIndex];
    }

My EXAMPLE.i swig file has std:string includes:

%include <stl.i>
%include <std_string.i>

using std::string;
using std;

I am able to successfully call the function in python.
but when try to print the return std:string & reference,

>>> record_rrtr_info1 = record_rrtr.GetText(1)
>>>
>>> print record_rrtr_info1
<Swig Object of type 'std::string *' at 0x2b2b1b6f43c0>
>>> print dir(record_rrtr_info1)
['__class__', '__cmp__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__hex__', '__init__', '__int__', '__le__', '__long__', '__lt__', '__ne__', '__new__', '__oct__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'acquire', 'append', 'disown', 'next', 'own']


How do I print this Swig Obj.

Appreciate your help.

Thanks,
Ajay.