从Windows中的唯一文件标识符获取文件路径

Question

我只是在这里阅读此帖子，想知道是否可以从该ID中获取当前的文件路径。

那么，如果移动文件，我可以通过搜索该ID来获取新的文件路径吗？不幸的是，我找不到有关此主题的任何信息。

或ID仅用于识别文件并且不能用于跟踪位置？

预先感谢。

//添加代码

public class WinAPI
{
    [DllImport("ntdll.dll", SetLastError = true)]
    public static extern IntPtr NtQueryInformationFile(IntPtr fileHandle, ref IO_STATUS_BLOCK IoStatusBlock, IntPtr pInfoBlock, uint length, FILE_INFORMATION_CLASS fileInformation);
    public struct IO_STATUS_BLOCK
    {
        uint status;
        ulong information;
    }
    public struct _FILE_INTERNAL_INFORMATION
    {
        public ulong IndexNumber;
    }
    // Abbreviated, there are more values than shown
    public enum FILE_INFORMATION_CLASS
    {
        FileDirectoryInformation = 1,     // 1
        FileFullDirectoryInformation,     // 2
        FileBothDirectoryInformation,     // 3
        FileBasicInformation,         // 4
        FileStandardInformation,      // 5
        FileInternalInformation      // 6
    }
    [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 OpenFileById(IntPtr hFile, FILE_ID_DESCRIPTOR lpFileID, uint dwDesiredAccess, uint dwShareMode, uint dwFlagas);
    [StructLayout(LayoutKind.Explicit)]
    public struct FILE_ID_DESCRIPTOR
    {
        [FieldOffset(0)] public uint dwSize;
        [FieldOffset(4)] public FILE_ID_TYPE type;
       // [FieldOffset(8)] public Guid guid;
        [FieldOffset(8)] public long FileReferenceNumber;
    }
    public enum FILE_ID_TYPE
    {
        FileIdType = 0,
        ObjectIdType = 1,
        ExtendedFileIdType = 2,
        MaximumFileIdType
    };
    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;
    }
}
public class File_Handle
{
    public ulong Get_Index()
    {
        WinAPI.BY_HANDLE_FILE_INFORMATION objectFileInfo = new WinAPI.BY_HANDLE_FILE_INFORMATION();
        FileInfo fi = new FileInfo(@"D:TestTestfile.txt");
        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;
    }
    public string Retrieve_File(ulong Index)
    {
        // WinAPI.BY_HANDLE_FILE_INFORMATION objectFileInfo = new WinAPI.BY_HANDLE_FILE_INFORMATION();
        // WinAPI.FILE_ID_DESCRIPTOR Descriptor = new WinAPI.FILE_ID_DESCRIPTOR { dwSize = sizeof(uint) + sizeof(WinAPI.FILE_ID_TYPE) + sizeof(long), type = WinAPI.FILE_ID_TYPE.FileIdType, FileReferenceNumber = (long)Index };
        WinAPI.FILE_ID_DESCRIPTOR Descriptor = new WinAPI.FILE_ID_DESCRIPTOR { dwSize = 100, type = WinAPI.FILE_ID_TYPE.FileIdType, FileReferenceNumber = (long)Index };
        FileInfo fi = new FileInfo(@"D:TestTestfileRef.txt");
        FileStream fs = fi.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
        //FileStream wf = new FileStream(WinAPI.OpenFileById(fs.Handle, Descriptor, 0, 4, 0x08000000), FileAccess.ReadWrite);
        FileStream wf = new FileStream(WinAPI.OpenFileById(fs.Handle, Descriptor, 0, 0, 0x08000000), FileAccess.ReadWrite);
        WinAPI.BY_HANDLE_FILE_INFORMATION objectFileInfo = new WinAPI.BY_HANDLE_FILE_INFORMATION();
        WinAPI.GetFileInformationByHandle(wf.Handle, out objectFileInfo);
        fs.Close();
        wf.Close();
        return "Dummy";
    }
}

Answer 1

由于硬链接，文件可以具有多个路径。只要有人在文件上有开放的手柄，就可以保证文件ID稳定，但实际上它们在NTF上总是稳定的。碎片部可以改变fat32上的ID。

您可以尝试GetFileInformationByHandleEx，但结果可能会根据Windows版本和文件系统而有所不同。