[Swig-user] Java/C - mapping array of struct pointers

[Jepson, D. \(London\) <DJ...@ma...>]

Hi - I'm a beginner with SWIG and looking for some help. I am having
problems mapping a struct member, which is an array of struct pointers.

 

The C follows, and it is the mapping of Nested I am having trouble with.

 

In Thing, Nested is set with

  public void setNested(SWIGTYPE_p_p_Nested nested) {

    MQJNI.set_Thing_nested(swigCPtr,
SWIGTYPE_p_p_Nested.getCPtr(nested));

  }

 

My Java compilation fails with 

+++++++++++++++++++++++++++++++

TestMQ.java:15: setNested(SWIGTYPE_p_p_Nested) in Thing cannot be
applied to (Nested[])

         thing[t].setNested(nested);

                 ^

1 error

+++++++++++++++++++++++++++++++

 

So my question is, how am I supposed to call this from the Java? Do I
need to do something with SWIG typemaps? Take a look at the Java test
case - it shows I need to be able to construct Thing and Nested in the
Java, and pass it into the C.

 

Listings follow, but please let me know if you need anything else,

Thanks, Dave

 

 

The C header

+++++++++++++++++++++++++++++++

struct Nested {

   int        count;

};

 

struct Thing {

   struct Nested *nested[MAXSIZE_NESTED];

};

 

double calc(struct Thing thing[MAXSIZE_THING]);

+++++++++++++++++++++++++++++++

 

 

The SWIG file

+++++++++++++++++++++++++++++++

%module MQ

 

%include "typemaps.i"

%include "arrays_java.i"

%{

#include "sg.h"

%}

 

JAVA_ARRAYSOFCLASSES(Thing)

 

#define MAXSIZE_NESTED 10

#define MAXSIZE_THING  20

 

struct Nested {

   int        count;

};

 

struct Thing {

   struct Nested *nested[MAXSIZE_NESTED];

};

 

double calc(struct Thing thing[MAXSIZE_THING]);

+++++++++++++++++++++++++++++++

 

 

My Java test case.

+++++++++++++++++++++++++++++++

class TestMQ

{

   public static void main (String[] args)

   {

      System.loadLibrary("mqwrap");

 

      // function parameters

      Thing[] thing = new Thing[MQConstants.MAXSIZE_THING];

 

      for ( int t = 0; t < MQConstants.MAXSIZE_THING; t++ )

      {

         Nested[] nested = new Nested[MQConstants.MAXSIZE_NESTED];

         thing[t].setNested(nested);

 

         for ( int n = 0; n < MQConstants.MAXSIZE_NESTED; n++ )

         {

            nested[n].setCount(2);

         }

      }

 

      System.out.println("TestMQ");

      System.out.println("calc=" + MQ.calc(thing));

   }

}

+++++++++++++++++++++++++++++++

 



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