SWIG：使用导入的外部类型

Question

I am trying to wrap some libraries written in C++ to interface with JAVA using SWIG.

I have one C++ struct in one library used in one C++ function of another library as an argument.

common.h

namespace rina {
    namespace cdap_rib {
        typedef struct{
        int size_;
        void* message_;
        } ser_obj_t;
    }
}

This library is wrapped producing a class called eu.irati.librina.ser_obj_t in JAVA. That's fine. Then I have

utilities.h

class IPCPConfigEncoder {
    public:
        void encode (rina::cdap_rib::ser_obj_t& ser_obj);
}

which is wraped with SWIG producing

  public void encode(SWIGTYPE_p_rina__cdap_rib__ser_obj_t ser_obj) {
    ...
}

in a JAVA class. Looking around in I found ( SWIG Importing generated class from a different module and package into the current class ) and I added to .i

%typemap(javaimports) SWIGTYPE 
%{
    import eu.irati.librina.ser_obj_t;
%}

which produced

import eu.irati.librina.ser_obj_t;
public void encode(SWIGTYPE_p_rina__cdap_rib__ser_obj_t ser_obj) {
    ...
}

Then, I have a couple of questions

1. The import is added to all the java classes... how can I enclose it only to the desired class?

2. How can I tell SWIG to change SWIGTYPE_p_rina__cdap_rib__ser_obj_t for eu.irati.librina.ser_obj_t .

Note: Since common.h and utilities.h are in different libraries I can not put them together in the same swig module.

Answer 1

As @Felxo pointed in the coments, the only solution is to tell swig to understand also the other libraries interface wraping (so headers and how are they wrapped).

What I did:

1. I copied common.i into utilities wrapping folder.

2. I added into utilities.i

    /* this is the "copied" common.i */ %import "common.i" %pragma(java) jniclassimports=%{ import eu.irati.librina.ser_obj_t; %} 

   to add the import of the proxy class (you should change thais to point to your proxy class from a java path)

3. Remove from the copied common.i the unecessary instructions like %template , remember that, at this point, you are only "importing" the common.h, not wrapping it (you already wraped it before). Actually, the common.i should only include:

     %{ #include "common.h" }% 

   but no

     %include "common.h" 

4. Tell SWIG where are is the common.h as well as where is the utilities.h using the -I option