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Now it is time to consider the client application A special version of a rich client application is a smart client application When using a smart client, you can work independently of a server application (for example, using a laptop that is disconnected from the network) Microsoft Outlook 2003 is a good example of a smart client application With Outlook 2003, all data is stored on the client system and is synchronized with the Exchange Server when the server is available The user does not have to manually connect to and disconnect from the server; the connect/disconnect occurs automatically behind the scenes Outlook 2003 caches all e-mail from the user on the client If the user searches for an e-mail, writes new e-mail, or adds calendar information, it is all done locally As soon as the Exchange Server is available, all the data is synchronized The synchronization happens in both directions: Newly arrived e-mail is synchronized from the server to the client, while user edits are synchronized from the client to the server A smart client is "smart" to its users insofar as the user can work seamlessly in a disconnected distributed environment To make this possible, the client application itself needs a data layer to write information to a local data store The local data store can consist of simple XML files up to a local database, where the Microsoft Data Engine (MSDE) might be a good choice Figure 1-10 shows the layers that are needed on the client system with a smart client application A smart client usually needs presentation, business, and data layers on the client system These layers are used to cache data and synchronize it with the server system where the business and data layers are available, too The business and data services can have a different implementation on the client and server systems; for example, the data layer on the client can use XML files or the MSDE to store data, whereas the server system uses the features of a full-blown database such as Microsoft SQL Server Serviced components can be used on both the client and the server.

Functions for working with the browser back button and maintains a history of URLs Functions for associating other functions (behaviors) with DOM elements Functions for reading and writing browser cookies Functions for working with numbers that represent currency Functions for accessing persistence data sources Functions for working with Date objects Functions for internationalizing dates Functions for converting between common types of date formats Functions for implementing Drag and Drop capabilities on DOM elements Functions for adding visual effects to DOM elements Functions for performing internationalization Functions for using <iframe> and for generating <script> tags dynamically Functions to manipulate and format numbers Functions for reading HTML (or the elements created from HTML) and producing additional objects Functions for using Regular Expressions Functions for manipulating string objects

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In this chapter we ll create a project, Since its structure,this whole process has evolved study configure its modules, and show how development works with GWT GWT 10,

For integration with COM, COM callable wrappers (CCWs) are used for COM clients accessing NET components, whereas runtime callable wrappers (RCWs) are used for NET clients accessing COM objects Of course, in such scenarios, the NET client can be a NET component itself, whereas a COM client can be a COM object A CCW behaves like a COM object for a COM client, such as a COM client would expect As Figure 4-1 demonstrates, a CCW offers interfaces such as IUnknown and IDispatch for COM clients, although these are not implemented by the NET component Also, the CCW can be found in the registry, because COM clients always expect to find their components there When methods of the CCW are invoked, the CCW invokes methods of the NET components and deals with the issues of garbage collection by doing COM reference counting

This concludes are introductory discussion of the Dojo base and core features As you can see, Dojo covers a broad range of functionality Subsequent chapters allow us to explore these features in more detail and review more examples of actual usage

Figure 4-1 A COM callable wrapper (CCW)

significantly; now it s more streamlined, with a plugin for easier project creation and OOPHM for faster, simpler development and testing

Summary

The CCW also deals with the transformation of data types because the data types are different with NET and COM Some data types can

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