Part V in .NET

Build Denso QR Bar Code in .NET Part V
Part V
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Testing and Deploying
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Next, you need to make changes to the JavaScript that renders alternate content in the event that the proper version of Flash is not installed on the user s machine, as shown in Listing 22.9.
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LISTING 22.9 var alternateContent = <table id= messageTable ><tr><td> + This application requires the following be installed:<ol> + <li><a href= >Adobe® AIR™ Runtime</a></li> + <li><a href= air >UpdaterApp</a></li> + </ol>Please click on each link in the order above to complete the installation process.</td></tr></table> ;
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Finally, the third and last place that you will need to make changes is the no script block. This displays in the event that users do not have JavaScript enabled in their browsers, as shown in Listing 22.10.
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LISTING 22.10 <noscript> ... <li><a href= air >UpdaterApp</a></li> ... </noscript>
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Also note that there are some steps that you should take to ensure that the file is properly deployed from your Web server using the non-Flash links to the AIR file. These steps are detailed later in the section on manual installation. If you would like to customize the badge even further, you may be better off creating your own badge from scratch. The next section describes how you can accomplish this.
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Creating a Custom Install Badge
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Creating your own custom install badge is a fairly simple process. As mentioned in the previous section, Adobe has placed all the necessary logic for handling detection and installation in an SWF file named air.swf, which is available for download.
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Installation and Distribution
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The purpose behind this is that Adobe can quickly make changes to the file without needing to worry about redistributing it. For this reason, it is recommended that you always load the file at run time from the Adobe server rather than downloading it yourself and placing it on your own server or embedding it into your project. To get started, create a new Flash or Flex project and design the badge as you please. Inside of your logic, you will need to load the air.swf file, as shown in Listing 22.11. Once you have the air.swf file loaded, you can use its API to handle the detection of AIR and the installation process when the user clicks something, or however you wish to invoke it. Listing 22.12 shows a demonstration of the process altogether.
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Loading the air.swf File into Memory
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private function init():void { loadAIR(); } private function loadAIR():void { var loader:Loader = new Loader(); var loaderContext:LoaderContext = new LoaderContext(); loaderContext.applicationDomain = ApplicationDomain.currentDomain; loader.contentLoaderInfo.addEventListener(Event.INIT, onAIRInit, false, 0, true); // AIR_URL = loader.load(new URLRequest(AIR_URL)); } private function onAIRInit(event:Event):void { _air = Loader(; }
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Part V
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Testing and Deploying
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Using the air.swf File s API to Detect the Status of AIR on a User s Machine
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package org.airbible.install { import flash.display.Loader; import flash.display.Sprite; import; import; import; import flash.system.ApplicationDomain; import flash.system.LoaderContext; public class InstallBadge extends Sprite { private static const AIR_URL:String = air/browserapi/air.swf ;
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private static const APP_URL:String = examples/updater/UpdaterApp.air ; private static const AIR_VERSION:String = 1.0 ; private static const AIR_INSTALLED:String private static const AIR_AVAILABLE = installed ;
:String = available ;
private static const AIR_UNAVAILABLE:String = unavailable ; private var _air:Object; public function InstallBadge() { init(); } public function install():void { try { switch(_air.getStatus()) { case AIR_INSTALLED: { _air.installApplication(APP_URL, AIR_ VERSION);
Installation and Distribution
break; } case AIR_AVAILABLE: { _air.installApplication(APP_URL, AIR_ VERSION); break; } case AIR_UNAVAILABLE: break; default: break; } } catch(error:Error) } private function init():void { var loader:Loader = new Loader(); var loaderContext:LoaderContext = new LoaderContext(); loaderContext.applicationDomain = ApplicationDomain. currentDomain;
loader.contentLoaderInfo.addEventListener(Event.INIT, airInitHandler, false, 0, true); loader.load(new URLRequest(AIR_URL)); } private function airInitHandler(event:Event):void { _air = Loader(; stage.addEventListener(MouseEvent.CLICK, onClick); } private function clickHandler(event:MouseEvent):void { install(); } } }
Part V
Testing and Deploying
That s really all there is to making a custom Flash install badge. If using Flash is out of the question for various reasons, the next section covers how you can deploy the file directly from a Web server.