Re: [Swig-user] Fwd: How to typemap u8*(unsigned char *) to java byte[] (jbyteArray)?

[William S F. <ws...@fu...>]

This looks like a bug where multi-argument typemaps are not implemented 
for directors. You'd better log a bug report in the SF bug tracker. A 
possible workaround is to change your API to use a single parameter, so 
replace (u8* data, int size) with say DataSize_t, where

typedef struct {
   u8* data;
   int size;
} DataSize_t;

then write your typemaps to marshall DataSize_t to byte[].

William

On 27/12/10 11:52, José Santos wrote:
> Hello!
>
> I've been trying some aproaches but still can find a solution. Anyway, I
> think I'm very close:
>
> I added this to my module interface:
>
> %include "various.i"
> %include "typemaps.i"
>
> #if defined(SWIGJAVA)
>
> %typemap(in)     (u8 * BYTE, int LENGTH) {
> /* Functions from jni.h */
> $1 = (u8 *) JCALL2(GetByteArrayElements, jenv, $input, 0);
> $2 = (int)    JCALL1(GetArrayLength,       jenv, $input);
> }
> %typemap(jni)    (u8 * BYTE, int LENGTH) "jbyteArray"
> %typemap(jtype)  (u8 * BYTE, int LENGTH) "byte[]"
> %typemap(jstype) (u8 * BYTE, int LENGTH) "byte[]"
> %typemap(javain) (u8 * BYTE, int LENGTH) "$javainput"
>
> /* Specify signature of method to handle */
> %apply (u8 * BYTE, int LENGTH)   { (u8 * data, int size) };
>
> #else
> %apply (u8 * STRING, int LENGTH) { (u8 *  data, int size) };
> #endif
>
> but I get a swig warning:
>
> JavaSerialPortListener.h(13) : Warning 810: No jni typemap defined for
> se in JavaSerialPortListener::ReceivedBytes (skipping director method)
>
> and when I run, java throws an exception:
>
> Exception in thread "main" java.lang.NoSuchMethodError:
> SwigDirector_JavaSerialPortListener_ReceivedBytes
>      at SerialPortJNI.swig_module_init(Native Method)
>      at SerialPortJNI.<clinit>(SerialPortJNI.java:27)
>      at SerialPortEngine.getInstance(SerialPortEngine.java:38)
>      at SerialPort.main(SerialPort.java:41)
>
> What I'm missing?
>
> Thanks!
>
> José Santos
>
>
> ---------- Forwarded message ----------
> From: *José Santos* <ke...@gm... <mailto:ke...@gm...>>
> Date: Sun, Dec 26, 2010 at 6:22 PM
> Subject: How to typemap u8*(unsigned char *) to java byte[] (jbyteArray)?
> To: swi...@li... <mailto:swi...@li...>
>
>
> Hi,
>
> I'm trying to understand typemaps and java typemaps but I couldn't yet
> realize what should I do to achieve my goal, so I'm asking for help.
>
> First, I've a typedef that I massively use in the project:
>
> /typedef unsigned char u8;/
>
> I have a "observer/caller" implementation that I want to extend to Java
> and call from c++:
>
> /class JavaSerialPortListener
> {
> public:
>      JavaSerialPortListener(){};
>      virtual ~JavaSerialPortListener(){};
>      virtual void ReceivedBytes(u8* data, int size){return;};
> };/
>
> /class SerialPortEngine
> {
> protected:
>      std::set<JavaSerialPortListener *> _serialPortListeners;
>
> public:
>      // *** CONSTRUCTORS & DESTRUCTOR ***
>      SerialPortEngine();
>      virtual ~SerialPortEngine();
>
>      // *** METHODS ***
>      void addSerialPortListener(JavaSerialPortListener & listener)
> {_serialPortListeners.insert(&listener);};
>      void removeSerialPortListener(JavaSerialPortListener&
> listener){_serialPortListeners.erase(&listener);};
>      void Process()
>      {
>          ...
>          u8* data = ...somedata
>          int readedData = ...data size
>          for(std::set<ISerialPortListener*>::iterator
> it=_serialPortListeners.begin();it!=_serialPortListeners.end();it++)
>          {
>              (*it)->ReceivedBytes(data,readedData);
>          }
>      };
> };/
>
> Now, my module interface file:
>
> /%module(directors="1") SerialPort
> %{
> #include "JavaSerialPortListener.h"
> #include "SerialPortEngine.h"
> %}
>
> /* turn on director wrapping JavaSerialPortListener */
> %feature("director") JavaSerialPortListener;
>
> %include "JavaSerialPortListener.h"/
>
> and I would like that Java's ReceivedBytes method looked like this:
>
> /public class SerialPort extends JavaSerialPortListener
> {
>      static
>      {
>          System.loadLibrary("SerialPort");
>      }
>
>      @Override
>      public void ReceivedBytes(byte[] data)
>      {
>        ...
>      }
> }/
>
> So, how can I typemap u8*(unsigned char *) to java byte[] (jbyteArray)
> in a director like this?
>
> Thanks!
>
> --
> José Santos
>
>
>
> --
> José Santos
>
>
>
> --
> José Santos
>
>
>
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