From: Josef Wolf <jw@...>
Date: 2006-09-07T01:50:13+09:00
Subject: Re: How to store/load persistent data?

On Wed, Sep 06, 2006 at 07:10:18AM +0900, Logan Capaldo wrote:
> On Sep 5, 2006, at 5:40 PM, Josef Wolf wrote:

> >  class Foo
> >    def initialize
> >      canvas = TkCanvas.new.pack
> >      rect = TkcRectangle.new(canvas, 0, 0, 50, 50, "fill"=>"white")
> >    end
> >  end
> >
> >  begin
> >    x=Foo.new()
> >  end
> >
> >  GC.start
> >
> >  # Object destroyed but canvas and rectangle are still alive
> >
> >  Tk.mainloop
> >
> >I can't see a solution for this problem since I am a novice for  
> >ruby/OO/Tk.
> >How do you gurus handle such situations?
> 
> That just means that there is still a reference to those objects.  
> When all the references go away, then and only then ruby will collect  
> them (if it needs to.)

Exactly.  The Tk library holds the references.  To get rid of them, I
need to call canvas.delete(rect) for the rectangle and canvas.destroy
for the canvas.  When I add those two calls, they disappear without
messing with the GC.