Class question

[fugigoose]

I've made several classes, but i keep having the same problem. I can't seem to set one instance equal to another instance, though they are the same class, that is:

'---
private duck1 as new duck
private duck2 as new duck

duck1 = duck2
'----

This return the error "with or object block variable not set" or whatever. I can set individual properties, just not the whole instance. Is there a way to do this? Is there a function that needs to be in the class to tell it how to do this?

Any help will be appreciated!

 

[strongm]

Check out the keyword "Set"

 

[mobashir]

Set duck1 = duck2

 

[LazyMe]

Do you actually want to copy the class?
Or just another refrence to the class (which is what Set will do for you)?

Greetings,
Rick

 

[fugigoose]

I'd like to copy it, I think. I need it to be independent of the original class. I don't want duck2's changes to be applied to duck1. Is that what you mean? Thanks for the other help you guys. OMG I should've known SET, thats the problem I had with setting a pictureBox's image to a file. I just always assumed set was optional. So does that mean i have to write a public property set for everything in that class?

 

[paulbent]

No, Set in this context is used in a statement to assign an object reference to a variable. You create separate instances of Duck by using New in each variable assignment.

Dim duck1 As Duck
Dim duck2 As Duck

Set duck1 = New Duck
Set duck2 = New Duck

Paul Bent
Northwind IT Systems

http://www.northwindit.co.uk

 

[fugigoose]

I know that paul, but i'm trying to set duck1 = to duck2. I can create them just fine.

 

[Hypetia]

You can create two new objects. (Duck1 and Duck2)
You can reference an existing object by another variable
(Set Duck2 = Duck1)

But when you do this then the original object contained in Duck2 is destroyed and Duck2 simply starts pointing to Duck1. i.e. for example, if you make a change in the properties of Duck1, that change will be reflected in Duck2 as well and vice-versa. There is no more distinct Duck2, i.e. you will not have an independent copy.

What you need is a copy (or clone) of the original object, Duck1. This is not possible in a VB class although it is possible in some true OOP languages like Java and VB .NET.