private static String GetFinalPathName(String path)
{
Int32 nAccess = ReparseResolver.FILE_READ_EA;
Int32 nShare = ReparseResolver.FILE_SHARE_READ | ReparseResolver.FILE_SHARE_WRITE | ReparseResolver.FILE_SHARE_DELETE;
Int32 nMode = ReparseResolver.OPEN_EXISTING;
Int32 nFlags = ReparseResolver.FILE_FLAG_BACKUP_SEMANTICS;
IntPtr handle = ReparseResolver.CreateFileW(path, nAccess, nShare, IntPtr.Zero, nMode, nFlags, IntPtr.Zero);
if (handle == ReparseResolver.InvalidHandleValue)
{
throw new NativeException($"Could not resolve final path name for \"{path}\".", Marshal.GetHRForLastWin32Error());
}
try
{
nFlags = ReparseResolver.FILE_NAME_NORMALIZED;
// Obtain required result size.
Int32 length = ReparseResolver.GetFinalPathNameByHandleW(handle, null, 0, nFlags);
if (length < 1)
{
throw new NativeException($"Could not obtain required buffer size to resolve final path name for \"{path}\".", Marshal.GetHRForLastWin32Error());
}
StringBuilder builder = new StringBuilder(length);
Int32 result = ReparseResolver.GetFinalPathNameByHandleW(handle, builder, length, nFlags);
if (result < 1)
{
throw new NativeException($"Resolving final path name for \"{path}\" has failed.", Marshal.GetHRForLastWin32Error());
}
return(builder.ToString());
}
finally
{
ReparseResolver.CloseHandle(handle);
}
}
/// <summary>
/// Tries to resolve the physical file path.
/// </summary>
/// <remarks>
/// This method tries to resolve the physical file path of
/// provided <paramref name="filename"/>. The full name is
/// returned if parameter is not <c>null</c> or <c>empty</c>,
/// no matter if the file needs to be resolved or not.
/// </remarks>
/// <param name="filename">
/// The file name to resolve.
/// </param>
/// <param name="resolved">
/// True if file name could be resolved and false otherwise.
/// </param>
/// <returns>
/// The full path of the resolved file name.
/// </returns>
/// <exception cref="NativeException">
/// This exception is thrown in any error case. For example
/// the requested file name could not be opened for read access.
/// </exception>
public static String Resolve(String filename, out Boolean resolved)
{
resolved = false;
if (String.IsNullOrWhiteSpace(filename))
{
return(filename);
}
FileInfo info = new FileInfo(Path.GetFullPath(filename));
if ((info.Attributes & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint)
{
return(info.FullName);
}
filename = ReparseResolver.GetFinalPathName(info.FullName);
resolved = true;
return(filename);
}