Get Advanced Object Oriented Programming with Visual FoxPro 6.0 PDF

By Markus Egger, Mac Rubel

ISBN-10: 0965509389

ISBN-13: 9780965509381

This booklet combines OOP concept and real-world sensible knowledge, all from the visible FoxPro standpoint. coated are multi-tiered structure; OO layout styles; item metrics; and OO requisites, modeling, and layout, together with the UML.

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Extra info for Advanced Object Oriented Programming with Visual FoxPro 6.0

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As a matter of fact, they are pretty much the same internally. But there are several differences between real forms and classes that are subclasses of forms. Both have advantages, too, which makes it hard to decide which one to use. Instantiating forms The first big difference between classes and forms is how they are instantiated. I already described how classes are instantiated. Form classes cannot be members of other container classes (FormSets are the rule-proving exception, but I'll talk about these later).

In other words, the collection has properties and methods. 0 you can create collections that are much like the ones in VB. I'll deal with the naming part first. Suppose I have a form that has a button and a textbox. I add a collection (array) called "members" that will provide a generic way to access all the members of the form. I can either pass a numeric index to that collection, or the name of the object I want to talk to. &lvIndex. NULL. NULL. ENDCASE ENDFUNC The first thing the access method does is to check for the type of the parameter.

Every time you added code without doing a DoDefault() it would possibly overwrite important default behavior and cause severe misbehavior. For this reason, you can't just overwrite default behavior. However, there might be some reasons why you would like to overwrite the default FoxPro behavior. In this case, you can use the FoxPro keyword NODEFAULT. When you add code to a method, the original behavior is always executed after all the added code. This is very handy because you can use NODEFAULT at any position in a method.

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


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