ASP.NET PDF Viewer using C#, VB/NET

These classes are now ready to be consumed and bound to user-interface components. When you create the Flex project, an MXML application file is created. We like to name this primary application class main.mxml, but that s not required. If you wish to name it something else, you are free to do so. In main.mxml, we first include a set of user interface components and then bind the service to these components. You include a TextInput to allow users to enter an ISBN number, a TextArea to display the validation result (a Boolean value, either true or false), and a Button to invoke a web service call. The components can be included programmatically or by using design mode. In order to leverage the Flash Player data-binding features, switch to design mode and right-click the TextArea to bind it to the result of a web service call. In this small example, we ll validate a 13-digit book ISBN. We ll set the argument value to the ISBN of this book (AdvancED Flex 4), which is 9781430224839, entering this value through the TextInput component. The application has a button, labeled Validate ISBN. Clicking the Validate ISBN button invokes the web service operation to validate the entered ISBN. The result of the call is bound to the text area, where you can see if the ISBN is valid or not. Things will become clearer as you look through the code:

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21. As we ll see in the next subsection, however, it turns out (in another context) that SQL still has to do the same kind of thing we do anyway i.e., it still has to collect various constituent assignments together so it can hardly be argued that the fact that it doesn t have to do so in the case of multiple assignment is a significant advantage.

< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768" xmlns:isbnservice="services.isbnservice.*"> <fx:Script> <![CDATA[ import mx.controls.Alert; protected function button_clickHandler (event:MouseEvent):void { IsValidISBN13Result.token = isbnservice.IsValidISBN13(enterIsbnTextInput.text); } ]]> </fx:Script> <fx:Declarations> <s:CallResponder id="IsValidISBN13Result"/> <isbnservice:Isbnservice id="isbnservice" fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)" showBusyCursor="true"/> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:TextArea x="235" y="120" height="32" id="textArea" text="{IsValidISBN13Result.lastResult}"/> <s:TextInput id="enterIsbnTextInput" x="269" y="56"/> <s:Button id="validateIsbnButton" click="button_clickHandler(event)" x="287" y="87" label="Validate ISBN"/> </s:Application>

way to specify that lengths mustn t be negative. As we ve shown elsewhere (in The Third Manifesto in particular), therefore, SQL necessarily permits negative lengths, noncircular circles, nonsquare squares, and all kinds of similar nonsenses. Note: Possible reasons why type constraint support is omitted from SQL are discussed in the book mentioned several times already, An Introduction to Database Systems, 8th edition, by C. J. Date (Addison-Wesley, 2004). We close this subsection by noting that, owing to its lack of proper support for multiple table assignment, SQL can t directly handle either (a) the example discussed in the section A Multiple Assignment Example, or (b) the example discussed at the end of the section Assigning to a Variable More than Once, in the body of the chapter. Instead, it has to use several separate assignment statements in both cases, and bundle those statements up into a transaction. It also has to make sure the pertinent constraint checking is deferred.22

Synfig (GNU/Linux, Windows, Mac) is a vector-based 2D graphics application, designed to enable the production of feature-film quality animation with fewer people and resources (see Figure 5-10). It has both a server-side version and a graphical interface version that looks superficially similar to the GIMP. You can install the latter from the Add/Remove Programs tool in Ubuntu by selecting the package synfigstudio. If you install just the synfig package, you don t get the graphical interface. Ubuntu also has a package called synfig-examples that puts demo files in the /usr/share/doc/synfig-examples/ directory on the system. If you use Ubuntu, the examples package should be installed automatically when you install the synfigstudio package; if not, you can find it with the Synaptic package manager.

Although this is a simple example, you can see that consuming web services using the introspection tool is quite appealing. If you d like to go the traditional route, you could use the <mx:WebService /> tag. If you use this tag, you need to know in advance the callable remote methods or procedures, exposed as web service endpoints. This can be done using some means of introspection or by the crude method of browsing the port type definitions in WSDL. If the WSDL exposes very few methods, you can probably physically look it up fairly easily; otherwise, it could be a tedious effort. The rest of the logic, which involves

The statement was categorically not fine to begin with. And there was no attempt on my part to twist the paragraph beyond what [it] really means. I was merely indulging in the fine art of deconstruction which basically operates on the premise that you can judge a writer s intent only by what he or she has actually said, not by what you might possibly think he or she might possibly have wanted to have possibly said, but didn t.

service invocation, and result handling, is hardly different from the previous method. As always in Flex, the service has two events it can dispatch: result and fault. If the call goes through successfully, your result handler populates the text; otherwise it errors out. Let s morph the existing example within this style.