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First, let s start by creating a project a Hello World application if you will though we won t use it to showcase GWT, but rather to study the structure of a project (And we will throw some criticism at this simple application in 5, Programming the User Interface ) We won t do any coding because GWT can generate such code by itself, and it s good enough for our purposes And, by the way, the simplest way to create your own project and make certain that it was created correctly is by deleting Google s standard code and start writing your own You can create a GWT project in at least three ways: by means of the Google Plugin for Eclipse, by using a shell script, or even directly by hand, file per file though of course there isn t much going for the latter option, so we ll avoid it1

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Dojo base functions are contained in dojojs and are always available to the page when using Dojo by using the <script> tag to include the dojojs file Dojo core features must be explicitly requested by the page using the dojorequire() function The Dojo packaging system allows a web developer to specify which Dojo functions (and related JavaScript files) are included on a page The Dojo packaging system is available to developers to package their own JavaScript code

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be mapped directly because they have the same representation in memory, whereas others must be converted The data types with the same memory representation are known as blittable data types (eg, SystemInt16, SystemInt32, SystemInt64) The NET data type SystemString is converted to a COM BSTR data type BSTR is nonblittable If interoperability is used the other way around, an RCW (see Figure 4-2) offers the functionality that a NET client expects and manages a COM object The RCW is a good behavioral client to the COM object and offers pure NET functionality for the NET client With NET, you do not have to pay attention to the release of every reference to every COM interface because this is done by the RCW However, you still have to pay attention to the behavior of the garbage collector with the undeterministic behavior of freeing memory Because you are [6] dealing with native resources (COM objects), you must be aware of the dispose pattern To explicitly release the references to the COM object, you can use the class Marshal with the method ReleaseComObject You can find this class in the namespace SystemRuntimeInteropServices

The next chapter provides an overview of using Object Oriented Programming (OOP) techniques when working with DojoThis is important because the Dojo features are exposed to developers as objects So if you not familiar with OOP, as Bette Davis once famously said, Get ready for a bumpy ride Only kidding, OOP concepts aren t really that difficult, and after you understand them, you ll be able to program in a new and useful way

Originally, GWT provided some scripts to create a project with all required files and directories (and we ll look at this next) but using the Google Plugin for Eclipse (which we installed in 2, Getting Started with GWT 2 ) is by far the simplest way 1 In Eclipse, go to File, New, Other, Google, Web Application Project 2 Give the project a name (I inspiredly chose sampleproject)

Figure 4-2 A runtime callable wrapper (RCW)

Crude classifications and false generalizations are the curse of organized life George Bernard Shaw (1856 1950)

1 For just a single example of other ways to create a project, Maven users could utilize the CodeHaus plugin at http://mojocodehausorg/gwt-maven-plugin/, and it s likely that sooner or later you ll find plugins for just about any development environment

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