I have the following atl com object method:

CGraph::Test(LONG* size, BYTE** pByteBuf)
{
   *size = 5;
   *pByteBuf = (BYTE*)CoTaskMemAlloc((*size));

   for(int i=0; i< *size; i++)
   {
       pByteBuf[0][i] = i;
   }

   return S_OK;
}

I have edited the il for this method:

public hidebysig newslot virtual
instance void  Test([out] int32& size, [out] native int & pByteBuf)

The C# code is the following:

int numBytes = 0;
IntPtr buffer = IntPtr.Zero;
byte [] array = null;

graph.Test(out numBytes, out buffer);

if (numBytes > 0 && buffer != IntPtr.Zero)
{
   array = new byte[numBytes];                
   Marshal.Copy(buffer, array, 0, numBytes);
}

When I look the at the values in the array, only the first value is correct and rest of them are incorrect. Any ideas what I am doing incorrectly?