[C#] C#에서 C++ DLL의 Call by Referance out 인수 사용하는 방법

C# 프로그래밍을 하다보면 C++에서 만들어 둔 DLL을 사용해야 할 경우가 많이 있지요.
in 기능의 인수들을 그냥 대충 바꾸면 되는데
out 기능의 포인터를 사용한 Call by Referance 인수들을 참 난감합니다.
그러나 아래와 같이 선언하면 사용이 가능합니다.
참고 하세요.

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace SolarCellDGUI
{
    class SCMInterface
    {

        [DllImport("P:SolarCell_CTCShellExecDllsSCMBusClient.dll")]
            public static extern int ConnectToSCM(string MyIPAddr,
                [MarshalAs(UnmanagedType.LPArray)] Int32[] ConnectionID,
                [MarshalAs(UnmanagedType.LPArray)] byte[] EquipmentName);

        [DllImport("P:SolarCell_CTCShellExecDllsSCMBusClient.dll")]
            public static extern int DisconnectFromSCM(string MyIPAddr, int ConnetionID);

        [DllImport("P:SolarCell_CTCShellExecDllsSCMBusClient.dll")]
            public static extern int SendEventToSCM(int ConnectionID, string Source,
                string Destination, string EventName, string EventData, int EventDataLen,
                [MarshalAs(UnmanagedType.LPArray)] byte[] ResultData,
                [MarshalAs(UnmanagedType.LPArray)] Int32[] ResultDataLen);

        public bool SendEventSCM(int ConnectionID, string Source, string Destination,
            string EventName, string EventData, int EventDataLen, ref string ResultData, ref int ResultDataLen)
        {
            int res = 0;
            byte[] resData = new byte[100];
            Int32[] resDataLen = new Int32[1];
            char[] tempchr = new char[100];
            int i;

            res = SendEventToSCM(ConnectionID, Source, Destination, EventName, EventData,
                        EventDataLen, resData, resDataLen);

            if (res == 1)
            {
                ResultDataLen = resDataLen[0];

                for (i = 0; i < 100; i ++)
                    tempchr[i] = System.Convert.ToChar(resData[i]);
                ResultData = new string(tempchr);
                return true;
            }
            else
            {
                return false;
            }

        }

        public bool ConnectSCM(string MyIPAddr, ref int ConnectionID, ref string EquipmentName)
        {
            int res = 0;
            byte[] eqpName = new byte[80];
            Int32[] conID = new Int32[1];
            char[] tempchr = new char[80];
            int i;

            res = ConnectToSCM(MyIPAddr, conID, eqpName);

            if (res == 1)
            {
                ConnectionID = conID[0];

                for (i = 0; i < 80; i++)
                    tempchr[i] = System.Convert.ToChar(eqpName[i]);

                EquipmentName = new string(tempchr);
                return true;
            }
            else
            {
                return false;
            }

        }

        public bool DisconnectSCM(string MyIPAddr, int ConnetionID)
        {
            int res = 0;

            res = DisconnectFromSCM(MyIPAddr, ConnetionID);
           
            if (res == 1)
                return true;
            else
                return false;
        }

    }
}