Question

Using Java to call 3rd party DLL, JNI?

Asked by: jerra

I haven't had the time yet to investigate this further, I have very little time right now so I hope to get some pointers in which direction I should put my precious time as it is now. I need to access this VELLEMAN usb card from Java and the options I have from what I understand is to either wrap the VELLEMAN DLL using JNI or use 3rd party JAVA-USB bridge software and from there try to communicate with the card.

My question is basically, can I with JNI access any DLL without having access to the source code from which the DLL was compiled? I have the APIs from their documentation but thats all. The API seems quite simple and straightforward.

I very much hope for some advice which directions I should take, hope to get starting tomorrow morning.

DLL:
http://www.velleman.eu/downloads/files/downloads/k8055dll_rev3_0_2.zip

Manual/API:
http://www.velleman.eu/downloads/0/user/usermanual_k8055_dll_uk.pdf
http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k8055_uk_rev3.pdf

Thanks!

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Asked On
2009-09-11 at 11:31:21ID24725490
Tags

Java DLL JNI wrapper

Topic

Java Native Interface (JNI)

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: objectsPosted on 2009-09-11 at 14:58:07ID: 25313784

> My question is basically, can I with JNI access any DLL without having access to the source code from which the DLL was compiled?

you can

http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jni.html

 

by: jerraPosted on 2009-09-11 at 23:38:06ID: 25315434

OK, I forgot to add: I know nothing of C/C++ or compiling these things. I use Windows XP.

So considering these limitiations, can I still use a DLL from Java without having to fiddle with .h files etc? The example provided assumes one implements the native code aswell as the Java.
I have a DLL, I know the methods within that DLL but I can't use C/C++ myself.

 

by: jerraPosted on 2009-09-11 at 23:45:03ID: 25315448

and I use Ecplipse version: 3.5.0...

 

by: objectsPosted on 2009-09-11 at 23:48:43ID: 25315453

no, you'll need to write native JNI code to bridge between java and the dll

 

by: jerraPosted on 2009-09-11 at 23:52:18ID: 25315459

arghhhhh....
Any commercial libraries available so I can bypass this step? Just looking at : http://www.teamdev.com/store/jniwrapper/ but is is rather costly considering I am doing this for my schoolproject.

I guess it shouldn't be too hard to implement in C using the Eclipse C IDE but I have no experience whatsoever and that usually translates into a few days of finding setting and trying to figure out basic errors.

 

by: jerraPosted on 2009-09-12 at 02:05:44ID: 25315683

JNIWrapper does the job. I have already been able to manipulate the card connected via USB using the native DLL file. I'll award you the points cause you helped me understand that I can't use JNI without using C/C++.

 

by: jerraPosted on 2009-09-12 at 02:07:37ID: 31627712

I decided to use 3rd party software.

20120131-EE-VQP-002

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