From: Charles Calvert <cbciv@...>
Date: 2010-10-20T00:01:25+09:00
Subject: Re: How to open file dialog in Ruby, and get open FileName? :-(

On Thu, 23 Sep 2010 04:58:11 -0500, iMelody Ooo <imelody@msn.com>
wrote in <33bff42a89f93b4fe7d81cb0d212aa9d@ruby-forum.com>:

>This is a pop MessaheBox example, but I don't know how to open fiel
>dialog?
>
>shell = Win32API.new('user32','MessageBox',['L', 'P', 'P', 'L'],'I')
>shell.Call(0,"hello world","ShadowZ",0)

The signature of this function is:

int MessageBox(
  HWND hWnd,          // handle to owner window
  LPCTSTR lpText,     // text in message box
  LPCTSTR lpCaption,  // message box title
  UINT uType          // message box style
);

so your call looks correct at first glance.  Note that user32.dll
doesn't export a function named "MessageBox".  Instead, it exports
"MessageBoxA" and "MessageBoxW".  The former handles ASCII strings and
the latter wide strings (i.e. Unicode).  When writing C or C++ code,
one includes the appropriate headers that define the name "MessageBox"
as one of those two using a macro.  It may be that you need to call
the appropriate version of the function directly if the Win32API
library doesn't handle that for you.

-- 
Charles Calvert
Moderator - alt.computer.consultants.moderated
Submission Address: accm@celticwolf.net
Contact Address: accm_mod@celticwolf.net