SWIG C ++结构到Java

Question

I'm trying to get a simple SWIG example to work that uses a struct as a return type, but my generated file is incorrect. My files look like this.

SwigTest.h
#pragma once
#include "MyHeader.h"
class SwigTest
{
public:
    MyHeader testMe();
};

MyHeader.h
struct MyHeader {
    int x;
}

and my swig interface file is:

%module MyModule
%{
#include "SwigTest.h"
#include "MyHeader.h"
%}
extern MyHeader testMe();

The resulting JNI file has the following method declaration

public class MyModuleJNI {
  public final static native long testMe();
}

If my method returns a primitive, it works fine, but not with the struct. I'm running on windows with swig.exe -java -c++ MyModule.i

EDIT: I think I need to declare a struct in the .i file as well. Could someone confirm (or dispute) that? Thanks.

thanks, Jeff

Answer 1

Yes you need to declare the struct in the interface file as well.

Try this:

%module MyModule
%{
#include "MyHeader.h"
#include "SwigTest.h"
%}

%include "MyHeader.h"
%include "SwigTest.h"

Also its safer to declare the struct before the code that makes use of it.