xml文件转二进制文件的AIR

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" 
                        width="900" height="350"
                        creationComplete="init()"
                        alwaysInFront="false">
    
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            
            private var filePath:String;
            private var fileBytes:ByteArray;
            
            private function init():void
            {
                var funArr:Array = [];
                
                this.showStatusBar = true;
                this.status = "Copyright©2012 meteoric_cry.net.  Powered by Meteoric_cry";
                
                bindBtnsEvent();
            }
            
            private function showTopHandler():void 
            {
                if (this.stage.nativeWindow.alwaysInFront)
                {
                    this.stage.nativeWindow.alwaysInFront=false;
                    showTopBtn.label="前端显示";
                }
                else
                {
                    this.stage.nativeWindow.alwaysInFront=true;
                    showTopBtn.label="√前端显示";
                }
            }
            
            private function bindBtnsEvent():void
            {
                selectBtn.addEventListener(MouseEvent.CLICK, onSelectHandler);
                compressBtn.addEventListener(MouseEvent.CLICK, onCompressHandler);
                saveBtn.addEventListener(MouseEvent.CLICK, onSaveHandler);
            }
            
            private function getTypeFilter():FileFilter
            {
                var str:String = "*.xml;";
                
                var filter:FileFilter = new FileFilter("XML("+str+")", str);
                
                return filter;
            }
            
            private function onSelectHandler(evt:MouseEvent):void
            {
                var file:File = new File();
                file.addEventListener(Event.SELECT, selectFileCallback);
                file.browseForOpen("请选择一个文件", [getTypeFilter()]);
            }
            
            private function selectFileCallback(evt:Event):void
            {
                clear();
                
                var file:File = File(evt.target);
                file.removeEventListener(Event.SELECT, selectFileCallback);
                
                filePath = file.nativePath;
                
                xmlPathIpt.htmlText = filePath;
            }
            
            private function clear():void
            {
                xmlPathIpt.htmlText = "";
                
                filePath = null;
                fileBytes = null;
            }
            
            private function onCompressHandler(evt:MouseEvent):void
            {
                if (filePath)
                {
                    var file:File = new File(filePath);
                    
                    if (file.isDirectory == false && file.exists)
                    {
                        var fs:FileStream = new FileStream();
                        fileBytes = new ByteArray();
                        
                        fs.open(file, FileMode.READ);
                        fs.position = 0;
                        fs.readBytes(fileBytes, 0, fs.bytesAvailable);
                        fs.close();
                        
                        fileBytes.compress();
                        
                        Alert.show('文件压缩成功', '温馨提示', Alert.OK);
                    }
                    else
                    {
                        Alert.show(filePath + "不是一个正确的文件路径", '温馨提示', Alert.OK);
                    }
                }
                else
                {
                    Alert.show('请选择要压缩的文件', '温馨提示', Alert.OK);
                }
            }
            
            private function onSaveHandler(evt:MouseEvent):void
            {
                if (fileBytes)
                {
                    var fileName:String = new File(filePath).name.replace(/\.xml/, '');
                    
                    new FileReference().save(fileBytes, fileName + ".swf");
                    
                    Alert.show("文件" + fileName + ".swf保存成功", '温馨提示', Alert.OK);
                }
                else
                {
                    Alert.show('请先选择文件并进行压缩', '温馨提示', Alert.OK);
                }
            }
            
        ]]>
    </mx:Script>
    
    <mx:Button label="前端显示" right="10" top="3" click="showTopHandler();" id="showTopBtn"/>
    
    <mx:HBox width="100%" horizontalScrollPolicy="off" verticalScrollPolicy="off" 
             paddingTop="100" paddingLeft="50" paddingRight="10" paddingBottom="10" 
             horizontalGap="0" verticalAlign="middle">
        
        <mx:Label text="请选择要进行压缩的文件：" />
        <mx:TextInput id="xmlPathIpt" width="400" editable="false" paddingLeft="2" paddingRight="2" />
        
        <mx:HBox width="100%" paddingLeft="20">
            <mx:Button id="selectBtn" label="选择文件" />
            <mx:Button id="compressBtn" label="压缩文件" />
            <mx:Button id="saveBtn" label="保存文件" />
        </mx:HBox>
        
    </mx:HBox>
    
</mx:WindowedApplication>