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Download e-book for iPad: Advanced Object Oriented Programming with Visual FoxPro 6.0 by Markus Egger, Mac Rubel

By Markus Egger, Mac Rubel

This booklet combines OOP idea and real-world functional knowledge, all from the visible FoxPro perspective. lined 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

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As you learned earlier in this chapter, you never have access to the actual object. The only form of access to objects is through the references or pointers. These pointers know the memory address of the objects. If you pass this memory address to another function, it will still point to the same address and therefore to the same object. For this reason, there is no need to pass object pointers by reference, because the result will be almost the same (all right, you might save a byte or two of memory).

It expects a grid to be in the same form. The algorithm goes out and tries to find that grid itself, which works great unless there is more than one grid in that form. Using a generic collection that allows referencing the grid by some generic name instead of the real name that can be different in every form, it allows me to reuse that class in many more instances. Note that I didn't have to redimension any array or anything else, because I only used the access method to reroute the calls. This makes handling these collections a lot easier.

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. This allows you to create class libraries that are distributed in compiled versions rather than in source code. This all may not look like a big deal, but it really is. Making sure the class library is in scope for CreateObject() becomes complex in real-life applications.

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