[Swig-user] Java director

[Jaroslav G. <jgr...@gm...>]

Hi,

I need to prevent a Java director from being garbage collected when it is not
referenced in JVM but a C++ code still uses it.

For instance, for Python I use the following:

void MyDirector::addref() {
     Swig::Director *d = SWIG_DIRECTOR_CAST(this);
     PyObject *self = d->swig_get_self();
     SWIG_PYTHON_THREAD_BEGIN_BLOCK;
     Py_INCREF(self);
     SWIG_PYTHON_THREAD_END_BLOCK;
}

void MyDirector::release() {
     Swig::Director *d = SWIG_DIRECTOR_CAST(this);
     PyObject *self = d->swig_get_self();
     SWIG_PYTHON_THREAD_BEGIN_BLOCK;
     Py_DECREF(self);
     SWIG_PYTHON_THREAD_END_BLOCK;
}

The C++ code then simply calls addref()/release() whenever it
acquires/releases ownership.

As far as the Java Swig::Director is concerned it looks like its
swig_java_change_ownership() method could fit my purpose but I
don't know where to get the JNIEnv* needed by that method.

Any ideas would be appreciated.

thanks, 
-- 
Jarda
http://jagpdf.com