From: "Marvin Gülker" <sutniuq@...>
Date: 2009-08-11T22:55:06+09:00
Subject: Re: Use Ruby to create Win executable?

Marc Heiler wrote:
> I think you might also invoke some basic window GUI components like an 
> alertbox and similar via ruby only. 

Yes, on Windows you can use features like the MessageBox() function from 
the Windows API. There are bindings to the Windows API in Ruby's 
standard library, but they have been deprecated in Ruby 1.9, so I would 
recommend you to use a gem here, too. win32-api does a very good job:

  require "rubygems" #if you're running pre-1.9
  require "win32/api"

  #Values just out of my head, I have no Windows to try at the moment
  #see MSDN (or Google ;-) ) for the correct values
  MB_OKCANCEL = 1
  MB_ICONERROR = 16
  ID_OK = 1
  ID_CANCEL = 2

  #Retrieve function "MessageBox" from "user32.dll"
  msgbox = Win32::API.new("MessageBox", 'LPPI', 'I', "user32")
  #This should display a dialog box with a white-on-red X and two 
buttons
  ret = msgbox.call(0, "An error occured. Do you want to continue?", 
"Error", MB_ICONERROR | MB_OKCANCEL) #The 0 indicates there's no parent 
window
  if ret == ID_OK
    #Continue your operation...
  elsif ret == ID_CANCEL
    #Cancel your operation...
  end

Marvin
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