By Markus Egger, Mac Rubel
This booklet combines OOP idea and real-world useful knowledge, all from the visible FoxPro standpoint. lined are multi-tiered structure; OO layout styles; item metrics; and OO standards, modeling, and layout, together with the UML.
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Extra info for Advanced Object Oriented Programming with Visual FoxPro 6.0
For this reason, I'll leave this discussion for somebody else. Besides the SCATTER NAME command, there are some others that create objects in a similar fashion. BROWSE NAME is one of them. Another one is DEFINE WINDOW NAME . As you can see, they all share the added NAME clause, which is an indicator that objects are created. Most of these commands are included for backward compatibility, and you should use the newer counterparts instead. Object references Object references are variables that point to objects.
They all have a name instead of a numeric index that nobody can remember anyway. In addition, they usually act much like an object. 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.
NewObject() The CreateObject() and NewObject() functions you've seen so far create new, independent objects. However, you'll also face situations where you have to add objects to an existing container (such as adding a new button or textbox to a form). NewObject() methods. Every container class (container, form, page, and so on) features these methods. NewObject() work similarly to the functions introduced above, but they require another parameter, the object name, since they don't return a new object reference but add it to the container object.