[Swig-user] Lua cstring_output_allocate alternative?

[John P. <jpo...@gm...>]

Hi SWIG Experts,
I'm currently attempting to use SWIG 2.0 to wrap C++ for use in Lua.

I have the following function i'm attempting to wrap:

// LuaTest.cpp
int Foo(char** s)
{
   *s = (char *) malloc(64);
   sprintf(*s, "Hello world\n");

   return 1;
}

Initially, the SWIG interface file contained the following:

// luaTest.i
%include "cstring.i"
%cstring_output_allocate(char **s, free(*$1));

However, while attempting to create the wrapper, SWIG output:

*swig.exe -c++ -lua luaTest.i
cstring.i not implemented for this target*

Ideally, from Lua I'd like to call the function as:

*retInt, retStr = luaTest.Foo()*

where retStr would contain "Hello World".

Is this there an alternative to cstring_output_allocate to achieve this?

Thanks!
- John