By Markus Egger, Mac Rubel
This ebook combines OOP idea and real-world useful knowledge, all from the visible FoxPro perspective. 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 the scope issue, the same rules apply as for finding function definitions. 0 introduces a new function to instantiate objects called NewObject(). It basically does the same job as CreateObject(), but it allows you to specify the class library as well. vcx") Using NewObject(), Visual FoxPro makes sure the class definition is in scope. You can specify visual class libraries (VCX) as well as PRG files. Also, NewObject() allows you to specify a compiled application that hosts the class definition.
You could specify how objects are added or subtracted from each other. This would be a truly great feature to have, but again, it's not object-oriented and there must be better ways to accomplish the same goal in truly object-oriented ways. You could provide methods that do just the same as the operators would. In addition, I don't see a way to implement something like that in Visual FoxPro because C++ compiles its programs in a very different manner from Visual FoxPro. Copying objects In Visual FoxPro, there is no way to create an exact copy or clone of an object at runtime.
The next program line checks if the object creation was successful. If not, I have to remove the item from the array. Of course, I can only remove an item if the length of the array is at least two items. Otherwise, I'd end up with a length of 0, which wouldn't be valid in FoxPro. However, this code doesn't deal with all possible scenarios. What if the user closes a form using the window's Close box? NULL. value in one item of the collection. In order to handle this scenario perfectly, I'd need to change the form classes so they tell the manager object that they are about to die.