Re: [Swig-user] Wrapping C++ MFC CString with Python

[codeoedoc <cod...@gm...>]

Hi Richard,

I haven't used MFC wrapping. In linux, to wrap an unknown type, one can do
something like:

%apply int { int32_t };

Hope it helps.

Xin

On Fri, Mar 1, 2013 at 5:52 AM, Richard Burcher <ric...@gm...>wrote:

> Hi folks, apologies if this is duplicated on the list.
>
> Set up:
> windows xp pro os
> Windows vc++ 2008
> python 2.7
> swig 2.0.9
>
> Working on wrapping a number of C++ classes into a Python wrapper but am
> encountering issues with MFC CString. Can successfully generate swig
> wrapper
> & compile the Python module & shared library within Visual Studios 2008.
> The
> module can be imported into Python 2.7, an object instance created but the
> issue arises when passing a string file path to a member function; Python
> reports: TypeError: in method 'CEnSimObject_SetFullFileName', argument 2
> of
> type 'CString'
>
> I've reviewed the swig wrapper section & somewhat understand that the issue
> is the creation of a CString pointer from the the passed in Python string.
> Reviewing this message board & web in general, many point to creating an
> MFC
> CString class wrapper & that std_string.i is a template for use. I have
> looked over these but am not sure how/where to implement this. I have tried
> using the %typemap mentioned in the swig documentation but again, not
> entirely sure how you define a conversion type.
>
> How do you let swig know about MFC & CString?
>
> Please note that I am quite new to C++ & only looking for some
> hints/pointers.
>
> Cheers,
>
> Richard
>
>
> swig wrapper file:
> -------------------------
> %module swig_pyEnsim
>
> %{
>
> #pragma once
>
> #ifndef _WIN32
> #define _WIN32 1
> #endif
>
> #include "stdafx.h"
> #define AFX_EXT_CLASS
>
> #include "D:\Projects\Kenue\EnSimCore\EnSimObject.h"
> #include "D:\Projects\Kenue\EnSimCore\EnSimDrawableObject.h"
> #include "D:\Projects\Kenue\EnSimCore\TableObject.h"
> %}
>
> %include "stdafx.h"
> %define AFX_EXT_CLASS
> %enddef
>
> %include "D:\Projects\Kenue\EnSimCore\EnSimObject.h"
> %include "D:\Projects\Kenue\EnSimCore\EnSimDrawableObject.h"
> %include "D:\Projects\Kenue\EnSimCore\TableObject.h"
>
> ---------
> python function:
>
> def SetFullFileName(self, *args): return
> _swig_pyEnsim.CEnSimObject_SetFullFileName(self, *args)
>
> ---------
> section of swig generated wrapper:
>
> SWIGINTERN PyObject *_wrap_CEnSimObject_SetFullFileName(PyObject
> *SWIGUNUSEDPARM(self), PyObject *args) {
>   PyObject *resultobj = 0;
>   CEnSimObject *arg1 = (CEnSimObject *) 0 ;
>   CString arg2 ;
>   void *argp1 = 0 ;
>   int res1 = 0 ;
>   void *argp2 ;
>   int res2 = 0 ;
>   PyObject * obj0 = 0 ;
>   PyObject * obj1 = 0 ;
>   BOOL result;
>
>   if (!PyArg_ParseTuple(args,(char
> *)"OO:CEnSimObject_SetFullFileName",&obj0,&obj1)) SWIG_fail;
>   res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_CEnSimObject, 0 |  0 );
>   if (!SWIG_IsOK(res1)) {
>     SWIG_exception_fail(SWIG_ArgError(res1), "in method '"
> "CEnSimObject_SetFullFileName" "', argument " "1"" of type '" "CEnSimObject
> *""'");
>   }
>   arg1 = reinterpret_cast< CEnSimObject * >(argp1);
>   {
>     res2 = SWIG_ConvertPtr(obj1, &argp2, SWIGTYPE_p_CString,  0  | 0);
>     if (!SWIG_IsOK(res2)) {
>       SWIG_exception_fail(SWIG_ArgError(res2), "in method '"
> "CEnSimObject_SetFullFileName" "', argument " "2"" of type '"
> "CString""'");
>     }
>     if (!argp2) {
>       SWIG_exception_fail(SWIG_ValueError, "invalid null reference " "in
> method '" "CEnSimObject_SetFullFileName" "', argument " "2"" of type '"
> "CString""'");
>     } else {
>       CString * temp = reinterpret_cast< CString * >(argp2);
>       arg2 = *temp;
>       if (SWIG_IsNewObj(res2)) delete temp;
>     }
>   }
>   result = (arg1)->SetFullFileName(arg2);
>   resultobj = SWIG_NewPointerObj((new BOOL(static_cast< const BOOL&
> >(result))), SWIGTYPE_p_BOOL, SWIG_POINTER_OWN |  0 );
>   return resultobj;
> fail:
>   return NULL;
> }
>
> --
> Cheers,
>
> Richard
>
> ------
> Please note:
> I only check email a few times during business hours.
>
> Richard Burcher
> 613-799-4240
>
> LinkedIn: http://linkd.in/richardburcher
> Twitter: @richardburcher
> Blog: http://geotechrichard.com/
>
>
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