Module: Winhelper

Extended by:
FFI::Library
Defined in:
lib/filewatch/winhelper.rb

Defined Under Namespace

Classes: FileInformation, FileTime

Class Method Summary collapse

Class Method Details

.GetWindowsUniqueFileIdentifier(path) ⇒ Object 



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# File 'lib/filewatch/winhelper.rb', line 41

def self.GetWindowsUniqueFileIdentifier(path)
  handle = GetOpenFileHandle(path, 0, 7, nil, 3, 128, nil)
  fileInfo = Winhelper::FileInformation.new
  success = GetFileInformationByHandle(handle, fileInfo)
  CloseHandle(handle)
  if  success == 1
    #args = [
    #		fileInfo[:fileAttributes], fileInfo[:volumeSerialNumber], fileInfo[:fileSizeHigh], fileInfo[:fileSizeLow], 
    #		fileInfo[:numberOfLinks], fileInfo[:fileIndexHigh], fileInfo[:fileIndexLow]
    #	]
    #p "Information: %u %u %u %u %u %u %u " % args
    #this is only guaranteed on NTFS, for ReFS on windows 2012, GetFileInformationByHandleEx should be used with FILE_ID_INFO, which returns a 128 bit identifier
    return "#{fileInfo[:volumeSerialNumber]}-#{fileInfo[:fileIndexLow]}-#{fileInfo[:fileIndexHigh]}"
  else
    #p "cannot retrieve file information, returning path"
    return path;
  end
end