# 
# a small ruby script to retrieve the content of the Windows clipboard
# handles strings containing zeroes
#
# public domain
#

require 'Win32API'

class Clipboard
	OpenClipboard = Win32API.new('user32', 'OpenClipboard', ['I'], 'I')
	CloseClipboard = Win32API.new('user32', 'CloseClipboard', [], 'I')
	GetClipboardData = Win32API.new('user32', 'GetClipboardData', ['I'], 'I')
	GlobalLock = Win32API.new('kernel32', 'GlobalLock', ['I'], 'I')
	GlobalSize = Win32API.new('kernel32', 'GlobalSize', ['I'], 'I')
	GlobalUnlock = Win32API.new('kernel32', 'GlobalUnlock', ['I'], 'I')
	Memcpy = Win32API.new('kernel32', 'RtlMoveMemory', ['P', 'I', 'I'], 'I')

	def self.getdata
		sleep 0.1 while OpenClipboard.call(0) == 0
		if (h = GetClipboardData.call(1)) != 0 and
		   (p = GlobalLock.call(h)) != 0
			sz = GlobalSize.call(p)
			ret = 0.chr * sz
			Memcpy.call(ret, p, sz)
			GlobalUnlock.call(h)
		end
		CloseClipboard.call()
		ret
	end
end