How do I make C++/wxWidgets code accessible to a wxPython app? - c++

Question

I have a code library which is written in C++ and makes extensive use of the wxWidgets library. I'm now trying to wrap my library (currently using SWIG) so that it's callable from wxPython, but I've hit a wall:
------ Build started: Project: MyLibLib, Configuration: Release_SWIG_OutputForBin Win32 ------
Performing Custom Build Step
In order to function correctly, please ensure the following environment variables are correctly set:
PYTHON_INCLUDE: C:\Python26\include
PYTHON_LIB: C:\Python26\libs\python26.lib
d:\MyProject\Software\MyLib\trunk\MyLib>C:\swigwin-2.0.0\swig.exe -python d:\MyProject\Software\MyLib\trunk\MyLibLib\MyLib.i
d:\MyProject\Software\MyLib\trunk\MyLib>if errorlevel 1 goto VCReportError
d:\MyProject\Software\MyLib\trunk\MyLib>goto VCEnd
Compiling...
MyLib_wrap.c
C:\wxWidgets-2.8.10\include\wx/wxchar.h(886) : warning C4273: '_snprintf' : inconsistent dll linkage
c:\Program Files\Microsoft Visual Studio 9.0\VC\include\stdio.h(358) : see previous definition of '_snprintf'
C:\wxWidgets-2.8.10\include\wx/buffer.h(127) : error C2061: syntax error : identifier 'wxCharBuffer'
C:\wxWidgets-2.8.10\include\wx/buffer.h(127) : error C2059: syntax error : ';'
C:\wxWidgets-2.8.10\include\wx/buffer.h(127) : error C2449: found '{' at file scope (missing function header?)
C:\wxWidgets-2.8.10\include\wx/buffer.h(127) : error C2059: syntax error : '}'
C:\wxWidgets-2.8.10\include\wx/buffer.h(127) : error C2059: syntax error : ')'
C:\wxWidgets-2.8.10\include\wx/buffer.h(129) : error C2061: syntax error : identifier 'wxWritableCharBuffer'
C:\wxWidgets-2.8.10\include\wx/buffer.h(129) : error C2059: syntax error : ';'
C:\wxWidgets-2.8.10\include\wx/buffer.h(129) : error C2059: syntax error : ':'
C:\wxWidgets-2.8.10\include\wx/buffer.h(134) : error C2061: syntax error : identifier 'wxWCharBuffer'
C:\wxWidgets-2.8.10\include\wx/buffer.h(134) : error C2059: syntax error : ';'
C:\wxWidgets-2.8.10\include\wx/buffer.h(134) : error C2449: found '{' at file scope (missing function header?)
C:\wxWidgets-2.8.10\include\wx/buffer.h(134) : error C2059: syntax error : '}'
C:\wxWidgets-2.8.10\include\wx/buffer.h(134) : fatal error C1004: unexpected end-of-file found
Build log was saved at "file://d:\MyProject\Software\MyLib\trunk\MyLib\Release_SWIG_OutputForBin\BuildLog.htm"
MyLibLib - 13 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Is there a particular way I should be going about this? I spent some time googling for similar errors, but got none which suggests I'm probably barking up the wrong tree here...?
[Edit] Is a dll and ctypes the answer?
[Edit] I tried including the main wx header in there, but it doesn't seem to fix the issue:
%{
#include <wx/wx.h>
%}
Am I going to have to go through and manually add each and every header from wxWidgets? Bear in mind there are a massive number of them!

Answer 1

Looks like your Mylib.i is not emitting in its generated C file to #include the header(s) defining wxCharBuffer and so on (or maybe missing #defines that make those include actually perform the needed function definitions, but that's less likely). Do you have the needed
%{
#include "wxwhatever.h"
%}
and so on in your .i file? Can you look at the generated .c and see what include directives are present or missing (or maybe in the wrong order)?
There's nothing especially tricky (that I know of) about the task you're attempting, and those error messages from the compiler just suggest to me "missing includes or the like"...