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Set ObjectVar = Nothing
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Note The Class_Initialize and Class_Terminate events are fired only when the actual object is created or destroyed. Merely setting one object variable to another will not trigger the Class_Initialize event. If two or more object variables point to the same object, merely setting one object variable to Nothing will not trigger the Class_Terminate event.
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Sometimes you ll find yourself in a situation where you have a local variable and a class-level variable with the same name. This frequently happens when you want to give a parameter in a method the same name as a property. To differentiate between a class-level variable and a local variable or parameter, you can prefix the class level variable with Me. as in the following example:
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If Me.Name <> Name Then
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In this statement, the variable Me.Name refers to a class-level variable, whereas the unquali fied variable Name refers to a local variable or parameter. Tip
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Identifying Things That Belong to Me The keyword Me can also be used to qualify any public or private element of a class from the code within that class, including class-level variables, subroutines, functions, and prop erty routines.
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Part 4: Advanced VBA
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The Class_Terminate event contains code that will be run just before an object is destroyed. This event is an ideal place to destroy any objects that are local to the class by setting them to Nothing using code like this:
Microsoft Office Excel 2003 Programming Inside Out
Practical Class Design
Now that you know what a class is and the mechanics of building one, it s worth briefly cov ering some practical tips for building classes.
A Simple Class
It s quite reasonable to create a class that simply contains only properties and no methods. (See Figure 14-2.)
14
Figure 14-2.
You can easily build a simple class in the Visual Basic Editor.
You can create this class by following these steps:
1 Select Insert, Class Module from the VBA main menu. 2 Select the new class in the Project Explorer, and change the Name property in the Properties window to Plant. 3 Enter the following statements into the Edit Window:
Public Public Public Public Public Public CommonName As String ScientificName As String Description As String RetailPrice As Currency WholesaleCost As Currency ProductNumber As Long
Part 4: Advanced VBA
Developing Class Modules
Extending a Simple Class
One of the advantages of using a class to hold related data is that you can easily extend the class using several different techniques. For example, you can easily add a synonym for an existing property with a pair of property routines like this:
Public Property Get CommonName() As String CommonName = Name End Property Public Property Let CommonName(value As String) Name = value End Property
These routines are used to return and modify a public class-level variable, thus allowing the user to manipulate the same value by using two different names. Another useful technique is to add a method that allows you to initialize all the properties of the class with a single call. Notice that the following routine takes advantage of the Me keyword so that anyone using this method would know which parameter affects which property:
Public Sub Init(Name As String, _ ScientificName As String, _ Description As String, _ RetailPrice As Currency, _ WholesaleCost As Currency, _ ProductNumber As Long) Me.Name = Name
Me.ScientificName = ScientificName
Me.Description = Description
Me.RetailPrice = RetailPrice
Me.WholesaleCost = WholesaleCost
Me.ProductNumber = ProductNumber
End Sub
A Collection Class
It s often useful to create a collection class to hold a group of objects. This task is made a lot easier by using the Visual Basic Collection object to store your data. The following code declares a Collection object variable that s local to the class. When the class is first instanti ated, the Collection object is created, and when the object is destroyed, the Collection object will also be destroyed.
Part 4: Advanced VBA
14
Microsoft Office Excel 2003 Programming Inside Out
Private MyPlants As Collection Private Sub Class_Initialize() Set MyPlants = New Collection End Sub Private Sub Class_Terminate() Set MyPlants = Nothing
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