C# code -to work with OLE created in C++

[atulbaxi1]

Hi everyone,
I am stuck with the problem like i am converting c++ code to C#. Now I am trying to get data from the system through OLE which is written in c++(that part I have to use as it is). My C# code able to talk with OLE, but not able to get data from it.

Following is the some example..

C++ code:

/************************************************** *****************************
OLESendCommand
the function used to send and receive data from the device

The public member variable 'UsingTunnel' is passed to the OLE function.


subsys : the subsystem
cmd : the command
reg8 : an option byte that is the fourth transmitted byte
dataout : 32 bit, little endian data.
this forms the payload bytes 4,5,6,7 (out of 0,1,2,3,4,5,6,7)

*resultinformation : this is the result returned from the transaction
often will be RET_ACK or RET_DATA32 or RET_NAK.

*recvbuffer : must be supplied with a uchar buffer 8 bytes long.
generally, only the first four bytes are filled, corresponding to the bytes
4,5,6,7 out of (0,1,2,3,4,5,6,7)

up to 8 bytes can be returned for long format commands

A non zero value is returned if there was no reply from the device.

************************************************** *****************************/

uint32 CCOMLib2::OLESendCommand(
     uint32 subsys,
    uint32 cmd,
    uint32 reg8,
    uint32 dataout,
    uint32 * resultinformation,
    uint8 * recvbuffer    //buffer 8 deep
) {
    uint32 result;
   try  {
        result=V.OleFunction("SendCommandTemp",UsingTunnel,
            DeviceAddress,
            subsys,
            cmd,
            reg8,
            dataout,
            resultinformation,
            (uint32*) &recvbuffer[0],
            (uint32*) &recvbuffer[4]);
      }
   catch (Exception &E)   {
 
          LM("Unable to access ole function with "+
          AnsiString(E.Message),3);
        return 2;
 
      }
   if (result) LM("failed.");
 
   return result;
}

C# code :

        public  unsafe Int32 OLESendCommand(Int32 subsys, Int32 cmd, Int32 reg8, Int32 dataout, Int32* resultinformation, ref byte[] recvbuffer)    //buffer 8 deep
           {
                Int32 result;
                byte[] buffer_1 = new byte[8];
                byte[] buffer_2 = new byte[8];
                try  
                {
                    //result = V.OleFunction("SendCommandTemp", UsingTunnel,
                    //DeviceAddress, subsys, cmd, reg8, dataout, resultinformation,
                    //ref recvbuffer[0], ref recvbuffer[4]);
                    result = (Int32)V.GetType().InvokeMember("SendCommandTemp", System.Reflection.BindingFlags.InvokeMethod, null, V,
                              new object[] { UsingTunnel, DeviceAddress, subsys, cmd, reg8, dataout,(Int32)resultinformation,
                                            recvbuffer[0], recvbuffer[4] });
//                                            buffer_1, buffer_2 });
                }
                catch (Exception e)
                {
                    LM("Unable to access ole function with "+e.Message,3);
                    return 2;
                }
                if (result != 0)    LM("failed.");
                return result;
            } 
 
 

Is it possible to talk with c++ OLE from C# code?
(ii) Can I build my own OLE , what details I require to build it?

Regards,
Atul Baxi