#!ruby
# -*- mode: ruby; coding: utf-8 -*-
# Last updated: <2022/08/17 03:50:52 +0900>
#
# win32api sample. use GetWindowRect
#
# Windows10 x64 21H2 + Ruby 1.8.7 p330 i386-mswin32

require "Win32API"

if ARGV.size != 1
  fn = File.basename(__FILE__)
  puts "Usage:\n    ruby #{fn} WINDOWHANDLE"
  exit
end

hwnd = ARGV[0].to_i
puts "Window Handle = #{hwnd}"

get_window_rect = Win32API.new("user32", "GetWindowRect", "lp", "i")
buf = "\0" * 256
get_window_rect.call(hwnd, buf)
x0, y0, x1, y1 = buf.unpack("l4")

w = x1 - x0
h = y1 - y0

puts "(x0, y0) = (#{x0}, #{y0})"
puts "(x1, y1) = (#{x1}, #{y1})"
puts "(w, h) = #{w}, #{h}"