May 20, 2009

Working with FILETIME in Ruby

Recently I have had to deal with the windows FILETIME struct in ruby.

MSDN defines this guy as “a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC).”

Well, the easy thing to do is add a method to the Time class that can convert to the format:

class Time
  # Convert the time to the FILETIME format, a 64-bit value representing the
  # number of 100-nanosecond intervals since January 1, 1601 (UTC).
  def wtime
    self.to_i * 10000000 + 116444736000000000
  end

  # Create a time object from the FILETIME format, a 64-bit value representing
  # the number of 100-nanosecond intervals since January 1, 1601 (UTC).
  def self.from_wtime(wtime)
    Time.at((wtime - 116444736000000000) / 10000000)
  end
end

Now I can do fancy things like:

some_bindata_struct.time = Time.now.wtime
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