Opc.Ua.Com.ServerFactory.ReadClasses C# (CSharp) Method

		private List<Guid> ReadClasses(IOPCEnumGUID enumerator)
		{
			List<Guid> guids = new List<Guid>();

			int fetched = 0;
			Guid[] buffer = new Guid[10];

			do
			{
				try
				{ 
                    IntPtr pGuids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(Guid))*buffer.Length);

                    try
                    {
                        enumerator.Next(buffer.Length, pGuids, out fetched);

                        if (fetched > 0)
                        {
                            IntPtr pos = pGuids;

                            for (int ii = 0; ii < fetched; ii++)
                            {
                                buffer[ii] = (Guid)Marshal.PtrToStructure(pos, typeof(Guid));
                                pos = (IntPtr)(pos.ToInt64() + Marshal.SizeOf(typeof(Guid)));
                                guids.Add(buffer[ii]);
                            }
                        }
                    }
                    finally
                    {
                        Marshal.FreeCoTaskMem(pGuids);
                    }
				}
				catch
				{
					break;
				}
			}
			while (fetched > 0);

			return guids;
		}