Simple use of ruby's fiddle library for windows messageboxes

fiddle_test.rb

# Load importer part of fiddle (ffi) library
require 'fiddle/import'

# Create module as body for an importer instance
module MessageBox
	# Extend this module to an importer
	extend Fiddle::Importer
	# Load 'user32' dynamic library into this importer
	dlload 'user32'
	# Set C aliases to this importer for further understanding of function signatures
	typealias 'HANDLE', 'void*'
	typealias 'HWND', 'HANDLE'
	typealias 'LPCSTR', 'const char*'
	typealias 'LPCWSTR', 'const wchar_t*'
	typealias 'UINT', 'unsigned int'
	# Import C functions from loaded libraries and set them as module functions
	extern 'int MessageBoxA(HWND, LPCSTR, LPCSTR, UINT)'
	extern 'int MessageBoxW(HWND, LPCWSTR, LPCWSTR, UINT)'
end

# Tests
MessageBox::MessageBoxA nil, "Hello world!の", "Fiddle ANSI", 0
MessageBox::MessageBoxW nil, "Hello world!の".encode("utf-16le"), "Fiddle WIDECHAR".encode("utf-16le"), 0