private static extern SafeFileHandle _OpenFileById(
[In] SafeFileHandle hVolumeHint,
[In, Out] ref FILE_ID_DESCRIPTOR lpFileId,
[In, MarshalAs(UnmanagedType.U4)] FileAccess dwDesiredAccess,
[In, MarshalAs(UnmanagedType.U4)] FileShare dwShareMode,
[In] IntPtr lpSecurityAttributes,
[In, MarshalAs(UnmanagedType.U4)] FileAttributes dwFlagsAndAttributes
);
private static SafeFileHandle _OpenFileById(SafeFileHandle hint, ref FILE_ID_DESCRIPTOR fileId) =>
_OpenFileById(
hint,
ref fileId,
FileAccess.ReadWrite,
FileShare.ReadWrite,
IntPtr.Zero,
_FILE_FLAG_BACKUP_SEMANTICS);
/// <inheritdoc />
public static string GetFilePath(long fileSystemId)
{
using (var handle = _CreateSafeFileHandle("."))
{
if (handle == null || handle.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var size = Marshal.SizeOf(typeof(FILE_ID_DESCRIPTOR));
var descriptor = new FILE_ID_DESCRIPTOR {
Type = FILE_ID_TYPE.FileIdType, FileId = fileSystemId, dwSize = size
};
return(GetFinalPath(handle, descriptor));
}
}
private static string GetFinalPath(SafeFileHandle handle, FILE_ID_DESCRIPTOR desc)
{
try
{
using (var handle2 = _OpenFileById(handle, ref desc))
{
if (handle2 == null || handle2.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
const int length = 128;
var builder = new StringBuilder(length);
_GetFinalPathNameByHandleW(handle2, builder, length, 0);
return(builder.ToString());
}
}
catch
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
return(null);
}