Advanced Object Oriented Programming with Visual FoxPro 6.0 - download pdf or read online

By Markus Egger, Mac Rubel

ISBN-10: 0965509389

ISBN-13: 9780965509381

This e-book combines OOP conception and real-world functional knowledge, all from the visible FoxPro perspective. coated are multi-tiered structure; OO layout styles; item metrics; and OO requisites, modeling, and layout, together with the UML.

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Those objects, on the other hand, can't go away either, because the references to each other keep them alive. However, all public references to these objects are gone and they are linked only internally, making it impossible to communicate with them. They just sit there, eat up your memory, and cause random GPFs every now and then. I've worked on projects where we spent several man-months trying to find mysterious crashes and memory leaks, only to discover that one object reference wasn't released properly.

C++ programmers will assure you that there are perfect solutions for all these problems, and I don't doubt it, but it's obvious that these constructions can end up as a maintenance nightmare. I personally would like to see multiple inheritance in Visual FoxPro, mostly to resolve implementation issues. However, I realize that not having multiple inheritance is not a show-stopper, and that it would introduce problems that would make Visual FoxPro almost impossible to use, especially for beginning and intermediate programmers.

The user can either enter the name directly, or click the command button to bring up a picklist form. The class is composed of a control class and three different member objects. You can see the object's structure in the Properties window. Note that all the member objects are visible in the Properties window and can be modified. Figure 3 shows how this class can be used in a form. Figure 3 . A sample control class used in a form. Note that the property sheet for the form does not show the member objects of the control class just the objects on the form.

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


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