public static extern UInt32 FilterFindNext( IntPtr hFilterFind, FltUserStructures._FILTER_INFORMATION_CLASS dwInformationClass, IntPtr lpBuffer, UInt32 dwBufferSize, out UInt32 lpBytesReturned );
public static extern UInt32 FilterFindFirst( FltUserStructures._FILTER_INFORMATION_CLASS dwInformationClass, IntPtr lpBuffer, UInt32 dwBufferSize, ref UInt32 lpBytesReturned, ref IntPtr lpFilterFind );