[dba-VB] VB6: Object Reference

Thanks Bryan,

My only issue with your method, is that it requires the parent code to
explicitly call the TearDown method to destroy the object.  If the TearDown
method isn't called (crashes, sloppy code, whatever), the object will remain
in memory.

I ran across a very interesting article through Google groups, about
establishing "Weak References".  Using the CopyMemory API call, you can
establish an uncounted reference to an object and avoid the common circular
reference problems.  A little bit more work and more risky (as an uncounted
interface, you need to handle cleanup manually).  Still, an interesting
read:
http://groups.google.com/groups?selm=7uluuc%24srp%241%40nntp1.atl.mindspring
.net&oe=UTF-8&output=gplain
  

-----Original Message-----
From: Bryan Carbonnell [mailto:carbonnb at sympatico.ca]
Sent: Friday, April 18, 2003 9:56 AM
To: dba-vb at databaseadvisors.com
Subject: Re: [dba-VB] VB6: Object Reference


It sounds like you will need a "Tear Down" method of your class.

In your calss add:

Public Sub TearDown ()

  Set mfrmMyForm.SourceObject = Nothing
  Set mfrmMyForm = Nothing

End Sub

Then when you want to destroy the class you need to call your 
TearDown method before you set it to nothing

'Close and destroy

YourClassVariable.TearDown
Set YourClassVariable = Nothing

It's the same approach you have to take when you build Parent 
Properties for Classes.

--
Bryan Carbonnell - carbonnb at sympatico.ca
Age is a very high price to pay for maturity.


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