Class: Ole::Types::FileTime

Inherits:
DateTime
  • Object
show all
Defined in:
lib/ole/types.rb

Overview

for VT_FILETIME

Constant Summary collapse

SIZE = 
8
EPOCH = 
new 1601, 1, 1

Class Method Summary collapse

Class Method Details

.dump(time) ⇒ Object

time should be able to be either a Time, Date, or DateTime.



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# File 'lib/ole/types.rb', line 80

def self.dump time
	# i think i'll convert whatever i get to be a datetime, because of
	# the covered range.
	return 0.chr * SIZE unless time
	time = time.send(:to_datetime) if Time === time
	# don't bother to use const_get here
	bignum = (time - EPOCH) * 86400 * 1e7.to_i
	high, low = bignum.divmod 1 << 32
	[low, high].pack 'V2'
end

.load(str) ⇒ Object

Create a DateTime object from a struct FILETIME (msdn2.microsoft.com/en-us/library/ms724284.aspx).

Converts str to two 32 bit time values, comprising the high and low 32 bits of the 100’s of nanoseconds since 1st january 1601 (Epoch).



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# File 'lib/ole/types.rb', line 63

def self.load str
	low, high = str.to_s.unpack 'V2'
	# we ignore these, without even warning about it
	return nil if low == 0 and high == 0
	# switched to rational, and fixed the off by 1 second error i sometimes got.
	# time = EPOCH + (high * (1 << 32) + low) / 1e7 / 86400 rescue return
	# use const_get to ensure we can return anything which subclasses this (VT_DATE?)
	const_get('EPOCH') + Rational(high * (1 << 32) + low, 1e7.to_i * 86400) rescue return
	# extra sanity check...
	#unless (1800...2100) === time.year
	#	Log.warn "ignoring unlikely time value #{time.to_s}"
	#	return nil
	#end
	#time
end