By Marco Cant?, Marco Cantù

Nonetheless the easiest Delphi Resource--Now totally up to date and Expanded
no matter if you are new to Delphi or simply making the flow from an previous model, studying Delphi 7 is the only source you cannot do with no. functional, tutorial-based assurance is helping you grasp crucial ideas in database, client-server, and net programming. And the insights of well known authority Marco Cantù provide the important wisdom to exploit what is new to Delphi 7--particularly its help for .NET. assurance includes:
* growing visible internet functions with IntraWeb
* Writing sockets-based functions with Indy
* developing data-aware controls and customized dataset components
* growing database functions utilizing ClientDataSet and dbExpress
* construction client-server functions utilizing InterBase
* Interfacing with Microsoft's ADO
* Programming for a multi-tiered program architecture
* making the most of Delphi's aid for COM, OLE Automation, and COM+
* profiting from Delphi's XML and cleaning soap support
* imposing web protocols on your Delphi app
* developing UML classification diagrams utilizing ModelMaker
* Visually getting ready stories utilizing RAVE
* utilizing the Delphi language to create your first .NET courses

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In fact, changing the value of the day might result in an invalid date, such as February 30. Using methods to access the internal representation of an object limits the risk of generating erroneous situations, because the methods can check whether the date is valid and refuse to modify the new value if it is not. Encapsulation is important because it allows the class writer to modify the internal representation in a future version. " You don't know about the internals: You only know how to interface with the black box or use it regardless of its internal structure.

This is the object-oriented approach to a classical programming concept known as information hiding. However, in Delphi there is the extra level of hiding, through properties, as we'll see later in this chapter. Delphi implements this class-based encapsulation, but it still supports the classic module-based encapsulation using the structure of units. Every identifier that you declare in the interface portion of a unit becomes visible to other units of the program, provided there is a uses statement referring back to the unit that defines the identifier.

You can even add new pages, rename or delete them, and change their order. An important element of the Object Repository setup is the use of defaults: • Use the New Form check box below the list of objects to designate a form as the one to be used when a new form is created (File → New Form). • The Main Form check box indicates which type of form to use when creating the main form of a new application (File → New Application), if no special New Project is selected. • The New Project check box, available when you select a project, marks the default project that Delphi will use when you issue the File → New Application command.

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