public unsafe void Read()
{
var iterator = Channel.BeginWrite(2048);
var data = iterator.Block.DataArrayPtr + iterator.Block.End;
var count = iterator.Block.Data.Offset + iterator.Block.Data.Count - iterator.Block.End;
var overlapped = Handle.AllocateNativeOverlapped(IOCallback, this, iterator.Block.DataArrayPtr);
overlapped->OffsetLow = Offset;
Iterator = new Box <MemoryPoolIterator>(iterator);
int r = ReadFile(FileHandle, data, count, IntPtr.Zero, overlapped);
// 997
int hr = Marshal.GetLastWin32Error();
if (hr != 997)
{
Channel.CompleteWriting(Marshal.GetExceptionForHR(hr));
}
}