By Markus Egger, Mac Rubel
This ebook combines OOP conception and real-world sensible knowledge, all from the visible FoxPro viewpoint. lined are multi-tiered structure; OO layout styles; item metrics; and OO requisites, modeling, and layout, together with the UML.
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Additional info for Advanced Object Oriented Programming with Visual FoxPro 6.0
Passing parameters to objects As I mentioned earlier, objects can receive parameters. All four functions and methods used to create objects support passing parameters. All the parameters are passed to the methods and functions as additional parameters. You simply need to know how many parameters each of the methods and functions support, and you can pass your parameters in addition to that. Let's have a look at how this works in each case: oForm = CreateObject("MyForm","Parameter1") The CreateObject() function is pretty simple and supports only one internal parameter, so parameter 2 would already be passed on to the instantiated object, where it would end up as parameter 1.
It is useful only when creating builders to automate processes while creating forms or classes. Chapter 3 What's Not So Obvious So far we have discussed all major object-oriented concepts and how they are implemented in Visual FoxPro. However, Visual FoxPro supports a couple of features you won't find in other object-oriented languages. This chapter gives us the chance to discuss these and other issues that aren't as obvious as they might seem. Instance programming and pseudo-subclassing Visual FoxPro has features called instance programming and pseudo-subclassing.
Vcx",,"Parameter1") These methods work according to their function counterparts, but they require one more parameter in front (the name of the object being added), so the rest of the parameters are shifted back one position. SCATTER NAME There are more commands that create objects, one of which is SCATTER NAME . This command takes the current record of a table or cursor and creates an object that has one property per table field. It also puts the 32 33 current field values into the properties. Here is an example: USE Customer LOCAL loData SCATTER NAME loData MEMO The resulting object doesn't have any methods not even constructors or destructors.
Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel