Thread: Using SWIG to wrap a C++ class for use in Java

Hello,

Has anyone here ever used SWIG before to get your C++ library to java?

I have a method that is declared like so

unsigned char** classify()

and I want to be able to use this method in java - preferrably returning to a byte array.

What do I need to do to my swig interface file so that it will let me have this type of return? So far, when I try to use the classify method in java, like:

byte[][] = p.classify()

It tells me that the return type of classify is void

more info:

I have a c++ function declared as

unsigned char** classify

I am using the following inteface file in SWIG

Code:

%module PWrap
%include "std_string.i"
%include "arrays_java.i"

%apply byte[][] {unsigned char**};

%{
#include "Classifier.h"
%}

%include "Classifier.h"

which generated some files, including a SWIGTYPE_p_p_unsigned_char object

Now, heres where I try to use this C++ function in java:

Code:

SWIGTYPE_p_p_unsigned_char data = pc.classify();//this works, but i cant do anything with the data object execept pass it to other C++ functions expecting unsigned char**
byte[][] data2 =pc.classify();//this does not work

So I really just need to know how to do the mapping to get that SWIGTYPE out of there, and be able to use btye correctly