How to call the DLL functions through Java

Hello,
I have already got a VC++ generated DLL. It has serveral functionalities. I need to call those functions from my Java Application. Now i know that it can be possible only through writing Java JNI Interfaces.
Everywhere i only see they give an example where in they tell to create an DLL. Now how do i will call if an DLL is ready and exists.
If anyone can give an example then it will be very helpful to me. Please mail me at [email protected] .
Thank you
vvpatro

You can't call functions in an arbitary DLL form Java. You need to use JNI to produce a 'wrapper' DLL that maps Java methods to the methods in the target DLL. The purpose of the wrapper is to allow type conversion between Java types and C/C++ types. The complexity of this task depends largely on the types used in th target DLL. If the targer DLL uses only primitive types such as char, byte, int, long, string, the translation is simple and the wrapper DLL will be 'thin'. If however, the target DLL passes arrays and objects, or employs callbacks, these more work to do, and the wrapper will be correspondingly 'thicker'.
Hope this helps.

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