获取文件夹ID C#

我试图追踪文件和文件夹的一生(他们可能会被移动或重命名)。 我已经完成search,发现FileSystemWatcher可能是最stream行的方式来跟踪文件和文件夹,但是,这不适用于我,因为应用程序可能会或可能不会始终运行。 我select尝试通过ID跟踪文件夹。

我已经find一种方法来跟踪来自这个堆栈post的答案的ID的文件。 在这个答案中,我可以基于方法B成功获取文件ID。

虽然search,我发现这个堆栈后,说他find了他的解决scheme使用FSCTL_GET_OBJECT_ID 。 我花了相当多的时间试图弄清楚如何使用这个function,但是我无法把头绕在里面。 我基本上没有从C#中调用本机窗口函数的经验。

任何人都可以给我一个正确的方向呢? 我觉得我一定是错过了一些明显的东西。

是否有一个原因C#不能访问文件/文件夹ID? 跟踪文件/文件夹不常见?

编辑,添加代码:

static uint returnVal; //Working example to get File ID public static string GetFileId(string path) { WinAPI.BY_HANDLE_FILE_INFORMATION objectFileInfo = new WinAPI.BY_HANDLE_FILE_INFORMATION(); FileInfo fi = new FileInfo(path); FileStream fs = fi.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite); WinAPI.GetFileInformationByHandle(fs.Handle, out objectFileInfo); fs.Close(); ulong fileIndex = ((ulong)objectFileInfo.FileIndexHigh << 32) + (ulong)objectFileInfo.FileIndexLow; return fileIndex.ToString(); } public static string GetFolderId(string path) { //Get a handle on the given folder IntPtr cFile = WinAPI.CreateFile( path, WinAPI.GENERIC_READ, FileShare.Read, IntPtr.Zero, (FileMode)WinAPI.OPEN_EXISTING, WinAPI.FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero); Console.WriteLine(path); Console.WriteLine(cFile); if ((int)cFile != -1) { int cFileSize = Marshal.SizeOf(typeof(IntPtr)); Console.WriteLine("cFile size = {0}", cFileSize); IntPtr cFileBlob = Marshal.AllocHGlobal(cFileSize); uint numBytesRead = 0; WinAPI.DeviceIoControl(cFile, WinAPI.FSCTL_GET_OBJECT_ID, IntPtr.Zero, 0, cFileBlob, (uint)cFileSize, ref numBytesRead, IntPtr.Zero); if (returnVal == 0) { Console.WriteLine(Marshal.GetLastWin32Error()); // Returning error 87 here } } //Should be returning the ID from the folder. return String.Empty; } public static void Main(string[] args) { Console.WriteLine(GetFileId(@"C:\Users\Matt\Desktop\TestDocument.txt")); Console.WriteLine(GetFolderId(@"C:\Users\Matt\Desktop")); } } class WinAPI { // Win32 constants for accessing files. internal const int GENERIC_READ = unchecked((int)0x80000000); internal const int FILE_FLAG_BACKUP_SEMANTICS = unchecked((int)0x02000000); internal const int OPEN_EXISTING = unchecked((int)3); internal const int FSCTL_GET_OBJECT_ID = 0x0009009c; internal const int FSCTL_CREATE_OR_GET_OBJECT_ID = 0x000900c0; [DllImport("kernel32.dll", SetLastError = true)] public static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode, IntPtr lpInBuffer, uint nInBufferSize, [Out] IntPtr lpOutBuffer, uint nOutBufferSize, ref uint lpBytesReturned, IntPtr lpOverlapped); [DllImport("kernel32.dll", SetLastError = true)] public static extern bool GetFileInformationByHandle(IntPtr hFile, out BY_HANDLE_FILE_INFORMATION lpFileInformation); [DllImport("kernel32.dll", SetLastError = true)] public static extern IntPtr CreateFile( String fileName, int dwDesiredAccess, System.IO.FileShare dwShareMode, IntPtr securityAttrs_MustBeZero, System.IO.FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile_MustBeZero); public struct BY_HANDLE_FILE_INFORMATION { public uint FileAttributes; public FILETIME CreationTime; public FILETIME LastAccessTime; public FILETIME LastWriteTime; public uint VolumeSerialNumber; public uint FileSizeHigh; public uint FileSizeLow; public uint NumberOfLinks; public uint FileIndexHigh; public uint FileIndexLow; } } 

我得到从DeviceIoControl返回错误“87”,这是根据MSDN上的post无效的参数(由于名誉限制,我无法发布更多的链接)。

Solutions Collecting From Web of "获取文件夹ID C#"

似乎你没有FileSystemWatcher问题。 所以,在C#中如何使用DeviceIoControl ,看看这个答案:

物理磁盘大小不正确(IoCtlDiskGetDriveGeometry)

对于这个问题,它是用下面的代码完成的:

 class Program { const uint FSCTL_GET_OBJECT_ID=0x0009009c; public static String GetFileId(String path) { using(var fs=File.Open( path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite) ) { WinAPI.BY_HANDLE_FILE_INFORMATION info; WinAPI.GetFileInformationByHandle(fs.Handle, out info); return String.Format( "{0:x}", ((info.FileIndexHigh<<32)|info.FileIndexLow)); } } public static WinAPI.FILE_OBJECTID_BUFFER GetFolderIdBuffer(String path) { using(var hFile=WinAPI.CreateFile( path, WinAPI.GENERIC_READ, FileShare.Read, IntPtr.Zero, (FileMode)WinAPI.OPEN_EXISTING, WinAPI.FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero )) { if(null==hFile||hFile.IsInvalid) throw new Win32Exception(Marshal.GetLastWin32Error()); var buffer=default(WinAPI.FILE_OBJECTID_BUFFER); var nOutBufferSize=Marshal.SizeOf(buffer); var lpOutBuffer=Marshal.AllocHGlobal(nOutBufferSize); var lpBytesReturned=default(uint); var result= WinAPI.DeviceIoControl( hFile, FSCTL_GET_OBJECT_ID, IntPtr.Zero, 0, lpOutBuffer, nOutBufferSize, ref lpBytesReturned, IntPtr.Zero ); if(!result) throw new Win32Exception(Marshal.GetLastWin32Error()); var type=typeof(WinAPI.FILE_OBJECTID_BUFFER); buffer=(WinAPI.FILE_OBJECTID_BUFFER) Marshal.PtrToStructure(lpOutBuffer, type); Marshal.FreeHGlobal(lpOutBuffer); return buffer; } } public static void Main(String[] args) { Console.WriteLine( GetFileId(@"C:\Users\Matt\Desktop\TestDocument.txt")); var buffer=GetFolderIdBuffer(@"C:\Users\Matt\Desktop"); var objectId=buffer.ObjectId .Reverse() .Select(x => x.ToString("x2")) .Aggregate(String.Concat); Console.WriteLine("{0}", objectId); } } class WinAPI { internal const int GENERIC_READ=unchecked((int)0x80000000), FILE_FLAG_BACKUP_SEMANTICS=unchecked((int)0x02000000), OPEN_EXISTING=unchecked((int)3); [StructLayout(LayoutKind.Sequential)] public struct FILE_OBJECTID_BUFFER { public struct Union { [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)] public byte[] BirthVolumeId; [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)] public byte[] BirthObjectId; [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)] public byte[] DomainId; } [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)] public byte[] ObjectId; public Union BirthInfo; [MarshalAs(UnmanagedType.ByValArray, SizeConst=48)] public byte[] ExtendedInfo; } [StructLayout(LayoutKind.Sequential)] public struct BY_HANDLE_FILE_INFORMATION { public uint FileAttributes; public FILETIME CreationTime; public FILETIME LastAccessTime; public FILETIME LastWriteTime; public uint VolumeSerialNumber; public uint FileSizeHigh; public uint FileSizeLow; public uint NumberOfLinks; public uint FileIndexHigh; public uint FileIndexLow; } [DllImport("kernel32.dll", SetLastError=true)] public static extern bool DeviceIoControl( SafeFileHandle hDevice, uint dwIoControlCode, IntPtr lpInBuffer, uint nInBufferSize, [Out] IntPtr lpOutBuffer, int nOutBufferSize, ref uint lpBytesReturned, IntPtr lpOverlapped ); [DllImport("kernel32.dll", SetLastError=true)] public static extern SafeFileHandle CreateFile( String fileName, int dwDesiredAccess, System.IO.FileShare dwShareMode, IntPtr securityAttrs_MustBeZero, System.IO.FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile_MustBeZero ); [DllImport("kernel32.dll", SetLastError=true)] public static extern bool GetFileInformationByHandle( IntPtr hFile, out BY_HANDLE_FILE_INFORMATION lpFileInformation); } 

名字空间需要使用:

 using Microsoft.Win32.SafeHandles;