Calling C/C++ code from Java?

What is the procedure used to call C/C++ code in library from Java?

TIA,

-Ramon F Herrera

Ramon F Herrera

Ramon F Herrera <> wrote:
> What is the procedure used to call C/C++ code in library from Java?

Google "JNI"

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

Chris Smith

In article < .com>,
"Ramon F Herrera" <> wrote:

> What is the procedure used to call C/C++ code in library from Java?
>
> TIA,
>
> -Ramon F Herrera

http://java.sun.com/docs/books/tutor...ve1.1/TOC.html

It sucks at first because you'll be facing an overwhelming number of
bugs in your code. After a while you get the hang of it and it's pretty
easy.

Run a leak check utility when you're using JNI. You'll leak memory if
you don't handle Java strings and arrays properly.

Kevin McMurtrie

On Mon, 28 Mar 2005 23:16:59 -0800, Kevin McMurtrie
<> wrote:

> In article < .com>,
> "Ramon F Herrera" <> wrote:
>
>> What is the procedure used to call C/C++ code in library from Java?
>>
>> TIA,
>>
>> -Ramon F Herrera
>
> http://java.sun.com/docs/books/tutor...ve1.1/TOC.html
>
> It sucks at first because you'll be facing an overwhelming number of
> bugs in your code. After a while you get the hang of it and it's pretty
> easy.
>
> Run a leak check utility when you're using JNI. You'll leak memory if
> you don't handle Java strings and arrays properly.


What would leak memory (which process?), and which type of utility would
you recommend to detect this?

Richard Chrenko

You may want to take at Jenie, www.servertec.com/products/jenie/jenie.html

Jenie is a collection of Java Classes and supporting native libraries that
allows developers to directly access native libraries without having to use
Java Native Interface (JNI) and without having to write C/C++ code.

"Ramon F Herrera" <> wrote in message
news: oups.com...
> What is the procedure used to call C/C++ code in library from Java?
>
> TIA,
>
> -Ramon F Herrera
>

Manuel J. Goyenechea

In article <>,
"Richard Chrenko" <> wrote:

> On Mon, 28 Mar 2005 23:16:59 -0800, Kevin McMurtrie
> <> wrote:
>
> > In article < .com>,
> > "Ramon F Herrera" <> wrote:
> >
> >> What is the procedure used to call C/C++ code in library from Java?
> >>
> >> TIA,
> >>
> >> -Ramon F Herrera
> >
> > http://java.sun.com/docs/books/tutor...ve1.1/TOC.html
> >
> > It sucks at first because you'll be facing an overwhelming number of
> > bugs in your code. After a while you get the hang of it and it's pretty
> > easy.
> >
> > Run a leak check utility when you're using JNI. You'll leak memory if
> > you don't handle Java strings and arrays properly.
>
>
> What would leak memory (which process?), and which type of utility would
> you recommend to detect this?

Which process? It's all one with JNI. It's possible to leak in the
process heap and the Java heap.

I've been using 'leaks' that comes with OS X. It scans for memory
allocations that don't appear to have any pointer to them. It's a
little slow and imperfect but it points out big leaks as bright as day.
When the environment variable "MallocStackLogging" is set, all
allocations are tagged with a stack trace that shows up in the output of
'leaks' and other debugging tools. It's very cool.

Kevin McMurtrie