Advanced PowerBuilder
Custom Class
Typically, they are used to encapsulate
business rules and extra functionality. You can add attributes ( instance variables ) and
declare events and functions ( methods ). Whenever you want to manipulate the attributes,
simply call the methods.
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AutoInstantiate property is available only
to the Custom Class user objects. It is not available to the standard Class user objects. |
You should declare the instance variables
as, either protected or private, otherwise any object can set their values, without going
through the methods declared at the object.
For example, you could create an external
function user object, to access the 16-bit Windows API calls. Methods ( functions ) are
then defined to get information from Windows by using these external functions.
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