By Markus Egger, Mac Rubel
This booklet combines OOP concept and real-world functional knowledge, all from the visible FoxPro standpoint. coated are multi-tiered structure; OO layout styles; item metrics; and OO specifications, modeling, and layout, together with the UML.
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Additional resources for Advanced Object Oriented Programming with Visual FoxPro 6.0
They are just convenient in case I want to talk to the new forms. They won't cause any troubles, either, because they go out of scope (since they are local) and won't result in outstanding object references. The form itself is kept alive by the array that's a member of the form manager. This requires that the form manager stay alive until the application finishes; otherwise, all the forms would disappear, too. As you can see, this is a lot of work compared to the simple DO FORM command above. So there are definite advantages to real forms when it comes to instantiation, especially multiple instantiation.
Most likely you won't be able to keep track of all the references using an automated mechanism. Release() All known references are automatically released by the object, and we don't have to take care of our own garbage. This saves us many lines of source code and a lot of sleepless nights. This works fine for all variable references. However, it might not work well if you also have property references, which I'll discuss in the next section. THIS, THISFORM, THISFORMSET and Parent The Visual FoxPro keywords THIS, THISFORM and THISFORMSET are special kinds of object references.
Whenever the collection is accessed without passing an index, I simply reroute the call to that object. To do so, I have to change the code from above just a little bit. oMembers Of course, this requires that there is an object called oMembers. This object can have all kinds of properties and methods. Refresh ? Count For these examples, you might not want to reroute the call to a separate object, but to THIS. The form object already has a Refresh and an AddObject method. It doesn't have a Count property, but that is easy to add.
Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel