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Declaring and Using a Class Module Object in Your Application

The previous sections of this chapter have discussed how you can implement a custom object's properties, methods, events, and collections in a class module.

Now it is time to see how to use a custom object in controlling code. Such code might reside in another module in the same application or in a separate ActiveX client.

Declaring and Instantiating a Class Object

You have two basic options for actually instantiating a Class object: Declare it like any other variable and assign its contents later, or instantiate the object when you declare it.

Declare Now, Instantiate Later

You can declare the custom object somewhere in your code just as you would declare a VB variable of a standard variable type. Use the class name as the variable, as in the following example:

   Private FF As FileFind

Later in your code, you need to use the Set and New keywords to instantiate the object:

   Set FF = New FileFind

Instantiate When You Declare

You can declare a Class object and instantiate it with a single statement by using the New keyword in the declaration statement:

   Private FF As New FileFind

Declaring WithEvents

If you plan to program the Class object's event procedures, you must use the WithEvents keyword in the declaration, as in the following example:

   Private WithEvents FF As FileFind

You can't use the New keyword in a WithEvents declaration, so you always have to instantiate these Class objects later, as described above in the section titled, "Instantiate When You Declare".


  

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