AIR: How to save locally a resource from Web

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
    <mx:Script>
        <![CDATA[
        import mx.controls.Alert;

        /**
         * loader object used to load content from web
         */
        private var loader:URLLoader = new URLLoader();

        /**
         * This function gets called when the application was loaded.
         * Initialize the loader object.
         */
        private function init():void {
            //we want to download images and other binary resources, 
            //so I overwrite the default value text to Binary
            loader.dataFormat = URLLoaderDataFormat.BINARY;
            //attach the event listeneri for load event and errors event
            loader.addEventListener(Event.COMPLETE, onLoad);
            loader.addEventListener(IOErrorEvent.IO_ERROR, onError);
            loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onError);
        }

        /**
         * This is the click handler for the button in page.
         * Just triger the load and disable the button so no other 
         * request can be sent while it is already running one.
         */
        private function saveResource():void {
            loader.load(new URLRequest(resURL.text));
            btn.enabled = false;
        }

        /**
         * This function gets called when the resource was loaded.
         * We just extract the name of the resource and call the saveLocally() function
         * to write the object on the local machine.
         */
        private function onLoad(event:Event):void {
            btn.enabled = true; //enable the button so we can send another request.
            var fileName:String = new String(resURL.text).split("/").pop();
            //call the saveLocally function; loader.data has the bytes of the loaded resource
            saveLocally(fileName, loader.data);
        } 

        /**
         * Error handler for loader object. 
         * I just display the error message and enable the button for new requests.
         */
        private function onError(event:ErrorEvent):void {
            btn.enabled = true;
            Alert.show(event.text, "Error");
        } 

        /**
         * This function does the actual saving.
         * @param file name to be used for saving
         * @param bytes to be written
         */
        private function saveLocally(fileName:String, data:ByteArray):void {
            //create a file under the application storage directory using the filename argument
            var file:File = File.applicationStorageDirectory.resolvePath(fileName);
            if (file.exists)
                file.deleteFile(); //delete it if exists
            //create a file stream to be able to write the content of the file    
            var fileStream:FileStream = new FileStream();
            //open the file stream and set for Write
            fileStream.open(file, FileMode.WRITE);
            //writes the bytes
            fileStream.writeBytes(data, 0, data.length);
            //close the stream
            fileStream.close();
            //display the path of the saved resources    
            showLocalPath.text = file.nativePath;
        }
        ]]>
    </mx:Script>
    <mx:VBox width="820" x="10" height="200" y="10">

        <mx:Label text="Save a web resource locally"  fontSize="26"/>
        <mx:Label text="Enter a resource URL such as http://mysite/image.jpg" />
        <mx:HBox>
            <mx:TextInput id="resURL" text=""  width="600"/>
            <mx:Button id="btn" click="saveResource()" label="Save locally" />
        </mx:HBox>
        <mx:Label id="showLocalPath" />
    </mx:VBox>
</mx:WindowedApplication>

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3 Responses to “AIR: How to save locally a resource from Web”

1. 1. jecson brad on August 6th, 2008 12:29 pm

   I set this property to I attach some functions to my loader for Complete and Error events.

2. 2. Storing data locally in AIR : Mihai CORLAN on September 2nd, 2008 7:05 pm

   [...] You can read more on this here. [...]

3. 3. avi on July 16th, 2009 11:05 am

   hi!!!!!
   I already have 100 video files (.swf format) which I want to play in the player(made in Flex Builder3)How can I store these videos files locally in SQLite and play them from there.After that how to bundle my AIR application and database together to distribute my application to users.Actually,I want to make completely offline application for users having no net connection. I will be thankful if u would give me code for this.

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