Trying to Bride OPC Interfaces

Hello Everybody,

I am new to the list.

I want to be able to access to OPC Interfaces (OLE for Process Control)
through  Java, and i have found JAWIN. Seems very interesting.

That OPC Interfaces uses COM VTable style for accesing.

I have the interface OPCServer in .IDL, .C and .dll so i have no problems to
generate stubs with the TypeBrowser Utitlity of JAWIG. But all the subs are
mainly not implemented. For that i have to create the code to generate the
interface between java and COM.

I have problems trying to pass structures by reference to the COM World

For example the "GetStatus" Function.

I have accomplished that the comInvoke() function doesn't throw me a
COMException but i can't get the correct data. I don't know what i amd doing
wrong.

I try to understand all the "instructions" but there is little or no
documentation that explains how works.
I have problems mainy with "structures" of data.


--------------------------------------------------------------------------
Code to get IPOCServer interface

         String OPCServerName = "ICONICS.SimulatorOPCDA";
         Ole32.CoInitialize(COINIT.MULTITHREADED);
         IOPCServer opcServer = new IOPCServer(OPCServerName);
         opcServer.GetStatus(null); <-- here i call the function (i dont
pass arguments yet because i am doing test, the arguments are harcoded inside

--------------------------------------------------------------------------
Code  for GetStatus call:

    int vTable = (3 /*Reserved Slots for IUnknown*/ + /* Slot for
GetStatus*/ 3 ) * 4;
    //int resultSize = 16 + 16 + 16 + 4 + 16 + 16 + 8 + 8+ 8+ 8 + 4;
    //String instructions ="A:H:n"+resultSize;
    int sizeStructure = 16 + 16 + 16 + 4 + 8 + 8 + 4 + 4 + 4 + 4 + 4;
    String instructions = "M"+sizeStructure+"G::n"+sizeStructure;
    int stackSize = 4;

    NakedByteStream nbs = new NakedByteStream();
    LittleEndianOutputStream leos = newLittleEndianOutputStream(nbs);
    leos.writeZeroBytes(sizeStructure); // there is no in arguments that i want
    nbs.size();

    byte[] result =comInvoke(vTable,instructions,stackSize,nbs,null);


    LittleEndianInputStream leis = new LittleEndianInputStream(new
ByteArrayInputStream(result));
    int resultMehtod = leis.readInt();

    long fileTime1 = leis.readLong();
    long fileTime2 = leis.readLong();

    long fileTime3 = leis.readLong();
    long fileTime4 = leis.readLong();

    long fileTime5 = leis.readLong();
    long fileTime6 = leis.readLong();

    int serverState = leis.readInt();
    long groupCont = leis.readLong();
    long bandwitdh = leis.readLong();
    int majorVersion = leis.readInt();
    int minorVersion = leis.readInt();
    int buildNumber = leis.readInt();
    int reserved = leis.readInt();

           return 0;
------------------------------------------------------



IDL definition for GetStatus procedure and structure involved
// Method from interface
//    HRESULT GetStatus(
//        [out] OPCSERVERSTATUS** ppServerStatus
//    );


//    typedef struct tagOPCSERVERSTATUS
//    {
//               FILETIME       ftStartTime;
//               FILETIME       ftCurrentTime;
//               FILETIME       ftLastUpdateTime;
//               OPCSERVERSTATE dwServerState;
//               DWORD          dwGroupCount;
//               DWORD          dwBandWidth;
//               WORD           wMajorVersion;
//               WORD           wMinorVersion;
//               WORD           wBuildNumber;
//               WORD           wReserved;
//      [string] LPWSTR         szVendorInfo;
//    }
//    OPCSERVERSTATUS;


//    typedef enum tagOPCSERVERSTATE
//    {
//        OPC_STATUS_RUNNING = 1,
//        OPC_STATUS_FAILED,
//        OPC_STATUS_NOCONFIG,
//        OPC_STATUS_SUSPENDED,
//        OPC_STATUS_TEST,
//        OPC_STATUS_COMM_FAULT
//    }
//    OPCSERVERSTATE;


//    typedef struct _FILETIME {
//       DWORD dwLowDateTime;
//       DWORD dwHighDateTime;
//     } FILETIME;
------------------------------------------------------

How is supposed that i have to read the structure OPCSERVERSTATUS?

I have full of structures to pass to COM World and receive from COM Wolrd.

Can you help me with that method? I have succesfully call the method without
 throwing a COM exception , but the data returned is not valid.




Thank you very much for your patience and help.

Kind Regards.