Hi
actually SWIG does most of the job. It has these java-directors which
allow you to call back from C++ into java.
There is however still the problem of getting the initial reference
from C++ to a java object. But one could program
around that I think.
Regards
Mark Donszelmann
On Oct 30, 2009, at 5:39 PM, Mike Swingler wrote:
> On Oct 29, 2009, at 4:18 PM,
peastman@... wrote:
>
>> I'm interested in invoking Java code from native code.
>> Basically, I'd like to be able to take a Java library, and package
>> it up as a standard dynamic library that can be invoked directly
>> from other languages.
>> Of course I could do this manually: write a bunch of JNI code to
>> start up a VM, expose all the Java classes through a native API,
>> and forward all calls to the appropriate Java objects. But that
>> would be a lot of work, and it seems like the sort of thing that
>> could be automated.
>> There are plenty of tools to automate going the other way. JNA,
>> SWIG, etc. will take a native API and automatically package it up
>> so you can call it from Java. But I haven't found anything to let
>> you easily call Java from native code. Does such a tool exist?
>
> I've never heard of an automatic tool that will take a set of
> arbitrary Java classes and re-export them as C++ or Objective-C
> classes, but the JavaNativeFoundation.framework may be able to help
> you interface with Objective-C more easily. The documentation is at <
http://developer.apple.com/mac/library/navigation/index.html#section=Topics&topic=Cross%20Platform
> >, and the headers are at /System/Library/Frameworks/
> JavaVM.framework/Frameworks/JavaNativeFoundation.framework/Headers.
> The JNFJObjectWrapper may be of particular interest to you if you
> need to put JNI global refs into the reference counted Foundation
> containers.
>
> You'll still need to instantiate the JVM yourself using JNI_CreateJVM
> (), but once you have it going, it shouldn't be hard to poke into it
> using JNF or JNI.
>
> Regards,
> Mike Swingler
> Java Runtime Engineer
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