Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel

By Markus Egger, Mac Rubel

This publication combines OOP thought and real-world functional knowledge, all from the visible FoxPro standpoint. lined are multi-tiered structure; OO layout styles; item metrics; and OO necessities, modeling, and layout, together with the UML.

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This is a very good way to remove objects from memory, because these methods try to release all the references that point to the actual object. Let me give you a little example to demonstrate why this is the case. Let's assume you had an object called oForm. Later on during runtime, you created additional references to this object. This kind of scenario happens often in large applications. Here's some sample code that constructs such a scenario: oForm = CreateObject("Form") oForm2 = oForm To release the oForm object, the oForm2 reference must be cleared as well.

T. Show() Both would have the same result. 0, I preferred to use the Show() method. This would allow me to add additional functionality if I needed some behavior every time a form was displayed. Now, I tend to use the first option (setting the property) because I can always add behavior using an assign method. Setting the property is a little faster, too (about 25 percent, according to my performance tests). So far, this has been easy. You created an object and displayed it. However, it gets even easier once you start using forms instead of classes.

Most likely, I would use a special security-manager object or something similar. Checking for access rights at the end of the instantiation process is only a waste of resources. CreateObject() Using the CreateObject() function is one of the simpler ways to create an object. You simply pass a class name and it returns a reference to the created object, as in the following example: oForm = CreateObject("Form") In this case, I'm creating an object based on the FoxPro base class Form. Of course I can use CreateObject() to create objects based on classes I created myself.

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