[AIR] ローカルに画像保存

/**
 * copyright (c) 2012 www.itoz.jp
 * @author itoz
 * @since 2012/06/20 19:55:22
 */
package jp.itoz.air.util
{
	import flash.events.ErrorEvent;
	import flash.filesystem.File;
	import flash.filesystem.FileMode;
	import flash.filesystem.FileStream;
	import flash.utils.ByteArray;
	import flash.events.EventDispatcher;
	import flash.events.IEventDispatcher;

	/**
	 * [AIR] ローカルに画像保存
	 */
	public class LocalImageSaver extends EventDispatcher
	{
		public function LocalImageSaver(target : IEventDispatcher = null)
		{
			super(target);
		}

		/**
		 * 保存
		 * @param writeFile
		 * @param imageBytes
		 */
		public function save(writeFile : File, imageBytes : ByteArray) : void
		{
			var stream : FileStream = new FileStream();
			try {
				
				stream.open(writeFile, FileMode.WRITE);
				stream.writeBytes(imageBytes, 0, imageBytes.length);
				
			}
			catch (e : Error) {
				dispatchEvent(new ErrorEvent(ErrorEvent.ERROR, false, false, writeFile + " 保存できませんでした"));
			}
			finally {
			stream.close();
			}
		}
	}
}

//sample
_saveDir = File.userDirectory;
var pngBytes : ByteArray 	= PNGEncoder.encode(myBitmapData);
_saver = new LocalImageSaver();
_saver.addEventListener(ErrorEvent.ERROR, onSaveError);
_saver.save(_saveDir.resolvePath("hoge"+"/"+_name), pngBytes);