Re: Re calling DLL in Java

["Larry Loen" <lwloen@xxxxxxxxxx>]

If you are using J++, you are on your own relative to native methods.

I last used J++ about 3 days after I purchased it.  I decided standards
were more important than whatever Bill Gates had/has in mind.  Find a good
book on J++ and its scheme for native methods.  It is apparently very
different.  Or, switch to a real JVM that complies with the applicable
standards.

In a conventional Java Native Method, you really can't expect     int [] to
be have like int *   when you pass an array to a native method.  The reason
is that an array is not just a pointer -- it is supposed to be a
first-class object in Java.  The C trick of int[] being treated as int*
need not apply not just at a language level, but at a deep and fundamental
level of "the JVM may not represent the array anything like that".   The
iSeries JVM does not preserve such a distinction, nor is it expected to.
It isn't just that pointers are left out of Java -- its that things inside
Java can be expected to be more different than you might expect.

But, who knows what J++ does.

Larry W. Loen  -   Senior Java and iSeries Performance Analyst
                          Dept HP4, Rochester MN
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