From: "Thomas B." <tpreal@...>
Date: 2008-10-13T02:57:52+09:00
Subject: Re: why the object doesn't respond to its method?

Li Chen wrote:
> Hi all,
> 
> I want to find out if an object responses to a method. while I can tell
> that the excel object(in this script) responses to method 'Visible or
> visible', my codes DO NOT come true. Any idea?

Hello. First, in your code you actually do not call the method Visible, 
you call the method Visible= and it's a big difference, generally.

But you won't find the method Visible= neither, as, as said above, the 
capitalised ole methods are handled by method_missing. You can see a 
list of ole methods like this:
excel.ole_methods
This gives an array of all the methods, where you can see Visible twice, 
once it is the method Visible and once Visible=, but you cannot tell one 
from another at a glance. To get just a list of, say, setters, to find 
the method Visible=, you write excel.ole_put_methods, and to get a list 
of getters (or probably other methods, but with exclusion of setters) 
you write excel.ole_get_methods.

Now there's one more problem - the list doesn't contain strings, but 
WIN32OLE_METHOD objects. I do not actually know how to handle this, but 
this is how you can check if Visible= is among the methods of the 
object:
excel.ole_put_methods.find{|m| m.name=="Visible"}
The above line returns nil iff excel does not respond to Visible=.

TPR.
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