Thanks for your answer. But I couldn't get the right value yet. I'd like to get the double array output from DLL by calling by reference. If you provide any sample code of doing this. It would be great to understand how to use it.

Could you give me a example for Memory or DoubleBuffer?

Date: Sun, 02 Mar 2008 09:16:29 -0500 From: Timothy Wall <twal...@dev.java.net> Content-type: text/plain; charset=UTF-8; format=flowed; delsp=yes Subject: [jna-users] call by reference of double array

If this is a COM DLL (that uses variants and safe arrays), you might be better off using JACOB, com4j or JAWIN, which know how to handle the various COM types.

However, if all you need is "double*" (which is what ByRef/Double nominally means), you can pass "double[]", "DoubleByReference" (if it's a single element), "com.sun.jna.Memory" (of the appropriate size), or java.io.DoubleBuffer (also of the appropriate size).