From: Jian Lin <blueskybreeze@...>
Date: 2009-11-15T03:41:46+09:00
Subject: Re: How to do a getPixel on Win32 using Ruby?

I thought it would be something like

user32 'GetPixel', ['L', 'I', 'I' ], 'L'

as in
-----------------------------------------------------------
require 'Win32API'

def user32(name, param_types, return_value)
  Win32API.new 'user32' , name, param_types, return_value
end

set_cursor_pos = user32 'SetCursorPos', ['L' , 'L' ], 'I'
mouse_event = user32 'mouse_event', ['L' , 'L' , 'L' , 'L' , 'L' ], 'V'

get_pixel = user32 'GetPixel', ['L', 'I', 'I' ], 'L'

get_pixel.call 0, 0, 0
-----------------------------------------------------------
but there is an error giving out

get_pixel.rb:4:in `initialize': GetProcAddress: GetPixel or GetPixelA 
(RuntimeError)

        from get_pixel.rb:4:in `new'
        from get_pixel.rb:4:in `user32'
        from get_pixel.rb:10

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