Interop.cs

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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.Win32.SafeHandles;
 
internal static class Interop
{
    internal enum BOOL
    {
        FALSE,
        TRUE
    }
 
    internal static class Kernel32
    {
        internal struct SECURITY_ATTRIBUTES
        {
            internal uint nLength;
 
            internal IntPtr lpSecurityDescriptor;
 
            internal BOOL bInheritHandle;
        }
 
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        internal readonly struct FILE_NOTIFY_INFORMATION
        {
            internal readonly uint NextEntryOffset;
 
            internal readonly FileAction Action;
 
            internal readonly uint FileNameLength;
        }
 
        internal enum FileAction : uint
        {
            FILE_ACTION_ADDED = 1u,
            FILE_ACTION_REMOVED,
            FILE_ACTION_MODIFIED,
            FILE_ACTION_RENAMED_OLD_NAME,
            FILE_ACTION_RENAMED_NEW_NAME
        }
 
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        internal unsafe static extern bool ReadDirectoryChangesW(SafeFileHandle hDirectory, byte[] lpBuffer, uint nBufferLength, bool bWatchSubtree, uint dwNotifyFilter, uint* lpBytesReturned, NativeOverlapped* lpOverlapped, void* lpCompletionRoutine);
 
        [DllImport("kernel32.dll", BestFitMapping = false, CharSet = CharSet.Unicode, EntryPoint = "CreateFileW", ExactSpelling = true, SetLastError = true)]
        private unsafe static extern SafeFileHandle CreateFilePrivate(string lpFileName, int dwDesiredAccess, FileShare dwShareMode, SECURITY_ATTRIBUTES* lpSecurityAttributes, FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile);
 
        internal unsafe static SafeFileHandle CreateFile(string lpFileName, int dwDesiredAccess, FileShare dwShareMode, FileMode dwCreationDisposition, int dwFlagsAndAttributes)
        {
            lpFileName = System.IO.PathInternal.EnsureExtendedPrefixIfNeeded(lpFileName);
            return CreateFilePrivate(lpFileName, dwDesiredAccess, dwShareMode, null, dwCreationDisposition, dwFlagsAndAttributes, IntPtr.Zero);
        }
    }
}