JNI + COM

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gripusa - 03 Jul 2007 10:05 GMT

I am tyring to workaround a dll written in Visualbasic (or you can say
a standard component) , is that possible that i can access that dll's
methods in java (my confusion is that i have only found examples
written in C++).

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Roedy Green - 03 Jul 2007 14:04 GMT

>I am tyring to workaround a dll written in Visualbasic (or you can say
>a standard component) , is that possible that i can access that dll's
>methods in java (my confusion is that i have only found examples
>written in C++).

You will need to write some glue in C++ to call the VB methods. The
C++ methods will have special signatures generated by the Javah
utility. Java declares the C++ methods as "native". Java calls C++
which in turn calls VB.

So you have everything you need.

See http://mindprod.com/jgloss/jni.html
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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timjowers - 03 Jul 2007 15:10 GMT

On Jul 3, 9:04 am, Roedy Green <see_webs...@mindprod.com.invalid>
wrote:

> >I am tyring to workaround a dll written in Visualbasic (or you can say
> >a standard component) , is that possible that i can access that dll's
[quoted text clipped - 12 lines]
> Roedy Green Canadian Mind Products
> The Java Glossaryhttp://mindprod.com

There is also a Java to COM bridge somewhere. http://danadler.com/jacob/
Java integration support was de-featured from the base windows+IIS
bundle with the demise of J++.

TimJowers

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Roedy Green - 04 Jul 2007 03:19 GMT

>There is also a Java to COM bridge somewhere. http://danadler.com/jacob/
>Java integration support was de-featured from the base windows+IIS
>bundle with the demise of J++.

There is a fair bit of pre-written JNI out there for the taking. You
don't have to do everything from scratch. However I have found most
of the time all you are doing is a few Windows system calls to give
access to an API from Java. The glue code is pretty trivial.

--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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gripusa - 04 Jul 2007 09:51 GMT

On Jul 4, 3:19 am, Roedy Green <see_webs...@mindprod.com.invalid>
wrote:

> >There is also a Java to COM bridge somewhere.http://danadler.com/jacob/
> >Java integration support was de-featured from the base windows+IIS
[quoted text clipped - 8 lines]
> Roedy Green Canadian Mind Products
> The Java Glossaryhttp://mindprod.com

Hi Roedy!
Yup , i found few bridges that let me do the functionlity but i
decided to apply the same formula to bridge things up in a c++ dll of
my own to call COM components rather then using a heavy bridge
between. (The actual decision is to create efficiency rather then
ease.)
Thanks for your replies.

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JNI + COM

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