FLEX 文件上载

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="294" height="144" usePreloader="true" viewSourceURL="srcview/index.html">
    <mx:Button x="112" y="23" label="文件上载" click="UploadFile();"/>
    <mx:ProgressBar id="ProgressBar" labelPlacement="bottom" themeColor="#F20D7A"
                minimum="0" visible="true" maximum="100" label="当前进度"  
                direction="right" mode="manual" width="200" x="53" y="67"/>
    <mx:Label x="147" y="81" text="Label" id="ProgressLabel"/>
<mx:Style>
    ProgressBar ...{
   barColor: #ff00cc;
   paddingLeft: 0;
   paddingRight: 3;
   textIndent: 0;
   letterSpacing: 0;
   trackHeight: 14;
   verticalGap: 0;
   fontSize: 12;
   fontWeight: normal;
}
</mx:Style>
<mx:Script>
<![CDATA[
        import flash.events.*;
        import mx.controls.Alert;
        import mx.events.*;
        private var file:FileReference = new FileReference();
        
        public function UploadFile():void...{
            file.addEventListener(Event.SELECT, onSelect);
            file.addEventListener(ProgressEvent.PROGRESS, onProgress);
            file.browse( [ new FileFilter("Images", "*.jpg;*.gif;*.png"), new FileFilter("Flash Movies", "*.swf") ] );
        }
        
        private function onSelect(e:Event):void ...{
        Alert.show("确认上载？" + file.name + "共" + Math.round(file.size/(1024*1024)) + "M?",
                    "文件上传",
                    Alert.YES|Alert.NO,
                    null,
                    doUpload);
        }
        
        private function onProgress(e:ProgressEvent):void...{
            ProgressLabel.text = "已上载"+ Math.round(e.bytesLoaded/1024) + "k 共计："+ Math.round(e.bytesTotal/1024) +"k";
            var proc:uint = e.bytesLoaded / e.bytesTotal *100;
            ProgressBar.setProgress(proc, 100);
            ProgressBar.label = "当前进度："+ proc +"%";
        }
        
        private function doUpload(e:CloseEvent):void...{
            if(e.detail == Alert.YES)...{
                var request:URLRequest = new URLRequest("http://wow.dgoo.net/test/upload.php");
                try ...{
                    file.upload(request);
                }
                catch(e:Error)...{
                    trace("上载错误");
                }
            }
        }
    ]]>
</mx:Script>
</mx:Application>