using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

using System.Runtime.InteropServices;

public delegate void ProcessDelegate(long ptr, long len);

namespace TestDll
{

   public interface ITestClass2
   {

       void YourProcedure();
       void SetDelegate(long ptr);
   }

   [ClassInterface(ClassInterfaceType.None)]
   public class Class2 : ITestClass2
   {
       private ProcessDelegate delProcess = null;

       public void YourProcedure()
       {
           Debug.Print("enter");
           if (this.delProcess != null)
           {
               byte[] test = System.Text.Encoding.Default.GetBytes("hello");
               GCHandle hObject = GCHandle.Alloc(test, GCHandleType.Pinned);
               IntPtr pObject = hObject.AddrOfPinnedObject();
               this.delProcess(pObject.ToInt64(), test.Length);
               if (hObject.IsAllocated)
                   hObject.Free();
           }
           Debug.Print("end");
       }

       public void SetDelegate(long ptr)
       {
           IntPtr intPrt = new IntPtr(ptr);
           delProcess = (ProcessDelegate)Marshal.GetDelegateForFunctionPointer(intPrt, typeof(ProcessDelegate));
       }

   }

}