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Inheritance is a fundamental feature of object-oriented design and programming While the use of class association, aggregation, and composition are just as important as inheritance when developing real programs, inheritance differs in that implementation support for it must be provided by the object-oriented programming language It is in the language support for inheritance that C++ most differs from C, or Java differs from earlier languages such as Pascal In the earlier Point and Circle example, we noted that having a Color class might e useful, and that it would make sense to generalize the concept of a shape To demonstrate inheritance in Java, we will develop a simple example that uses a Point class, a Color class, and a Shape class that will be used to define Circle and Rectangle classes (We could define other shapes, but two are enough to illustrate how to use the UML and Java to implement inheritance) First, let's design a general Shape class What is common to a Circle and a Rectangle Both will have an origin, and a color Furthermore, all shapes have some other common geometric attributes such as area and perimeter Thus, we will design a parent Shape class that accounts for these common factors by including objects of the Point and Color classes as attributes of Shape Area and perimeter will be handled by defining methods The calculation of area and perimeter will be defined by the subclasses of Shape In our example, we can reuse the Point class from earlier, but will need to add a new Color class We will also need a base Shape class that will be used to derive other specific shapes For our example, we will design new Circle and Rectangle classes that are derived from a Shape class First, here are UML class diagrams for the new Color class and again for Point:.

you add new methods to it The interface identifier is used during the Set statement to verify that the running objects support the IID promised by its designtime typelib description If a new client calls an old DLL that doesn't support the latest and greatest interface, the Set statement fails If you simply add new methods to the end of the vtable and leave the IID the same, the Set statement succeeds, but a subsequent method call might call a function off the end of the vtable (which almost always results in a crash) In either case, your program can't continue if the client code calls a method that isn't supported by the current version of the ActiveX DLL VB's IID odification process provides a kindler, gentler fatal error, but it's still a fatal error Constantly churning IIDs during rebuilds makes the individual components moving targets This can cause a number of problems during the development cycle This doesn't just create the bloat I've already described: It also forces you to recompile all the pieces of your application that consume a modified component, even if the calling code doesn't use the modified methods This problem is compounded when you work in a development team or if you call components from C+ + , which is forced to regenerate header files whenever the target typelib changes You want some level of compatibility control during the development process, but you rarely want the iron-clad protection that VB offers The full armor certainly doesn't hurt the shipping versions, but it is excessively cumbersome if you have to wear it all the time If you want the IID to remain the same when you modify an interface, you must pick and choose among three types of compatibility The type of compatibility you need depends entirely on how current versions of calling applications.

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bind to your object If the calling code is vtable bound, you need to maintain the vtable order and function signatures for all existing functions However, the actual names of the functions and the DISPID values can change because they are not used If your code is early-id bound, the vtable and names can change, but the DISPID values must remain the same If calling code is fully late-bound, you must keep the names the same In addition to these member changes, you can also change the class's name if existing code uses the New keyword exclusively instead of CreateObject Binary Compatibility Editing The PowerVB Binary Compatibility Editor (EditCompatDII), documented on the book's CD, provides complete control over the binary compatibility file You can make any direct edit to the file, provided it is compatible with VB-generated code This includes changing member names, changing IIDs, deleting entire types, deleting secondary interfaces (produced by Implements statements), adding members, and other similar actions Note that you should need this direct-editing capability only if you can't choose the Preserve Compatibility option when you compile your project Some of these edits might produce a change in the IID resources of the compatibility file Note that this leaves the resources of the compatibility file inconsistent with the compiled code: You can still use the file for compatibility reasons, but you won't be able to use it as an executable You can back out any IID updates generated by adding new members to an interface This takes place after a build has succeeded without compatibility errors by generating a new compatibility file (based on the typelib from the new EXE) and IIDs from the old compatibility file You can automatically remove all the aliasing baggage from your compatibility file Just rovide a directory that contains copies of all the previously shipped versions of your executable All the versions are analyzed to determine which of the intermediate interfaces must actually be supported Any aliased interfaces not found in previous versions are eliminated.

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DLL version compatibility problems, popularly referred to as quot;DLL hell," can be irreconcilable if only one version of the DLL is to be maintained in a single directory However, it is not necessarily simple to provide distinct version-specific directories for different versions There are several solutions. be set to DLLVER_PLATFORM_NT if the DLL cannot run . In Visual C# Using Barcode generation for . .Related: 

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2 If the required address for the data has already been occupied when a DLL comes to load, the DLL will not be usable This is quite possible, because the data is placed in a chunk which means that its address must start on a megabyte boundary, of which there are few A workaround would be to copy the program code for the DLL, and adjust he copy to use a different address for the static data, but the overhead would be unacceptably high. QR Code ISO/IEC18004 Generation In Visual C#.NET Using Barcode creation for .Related: 

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Draw EAN128 In Java Using Barcode creator for Java . EAN 13 Generator In Java Using Barcode creator for .One of the key packages in the Java system is the javanet library This provides support for accessing the network both as a client accessing remote services and as a server providing services to remote clients The role of the network in the life of the Java language is critical The most popular application areas for Java code will be those supported by mixed-platform environments where the ability to access remote information and services will be of prime concern The javanet package includes support or creating clients and servers, as well as classes for related requirements, such as those connected with network addresses.Related: EAN-8 Generation .NET WinForms , QR Code Generation VB.NET , Print Codabar C#

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A change is acceptable if every line of code affected by it can be altered, where necessary, and the code rebuilt against the changes In effect, this often means that a change must be restricted to the internals of a component rather than its public API For this reason, you should endeavor to keep private de nitions and header les (and anything else which is likely to be subject to change) out of the public domain A change is also acceptable if it can be veri ed as compatible, according to the guidelines I ve discussed here In general, the key compatibility issue for shared library DLLs is backward binary compatibility, with source compatibility an additional aim These guidelines derive from those used within Symbian, in accordance with the C++ standard I am very grateful to David Batchelor, John Forrest and Andrew Thoelke of Symbian who have previously written guides to compatibility best practice on ymbian OS, which I used as the basis of this chapter.

AIR applications are deployed for desktop operating systems, and Flash Professional CS5 and later can package your application s an iPhone app. But this chapter covers the important issues in preparing your Flash content for deployment on the web. Control code128b data with java to draw code 128 . code 128 data, size, image with java barcode sdk. .Related: QR Code Generation ASP.NET , VB.NET ITF-14 Generator , Interleaved 2 of 5 Generator VB.NET

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