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 var bitmapData:BitmapData = new BitmapData(myCanvas.width, myCanvas.height);
 bitmapData.draw(myCanvas,new Matrix());
 var byteArray:ByteArray = new JPEGEncoder(80).encode(bitmapData);
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       var request:URLRequest = new URLRequest(url);
       request.method=URLRequestMethod.POST;
       request.contentType = "application/octet-stream";//
       request.data = byteArray;
       var loader:URLLoader = new URLLoader();
       try{
                loader.load(request);
            }catch (error:Error) {
                Alert.show("ÉÏ´«Ê§°Ü");
            }
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      ExternalInterface.addCallback("setSessionId",setSessionId);//¸øjavascriptµ÷ÓõĽӿÚ
      private function setSessionId(argId:String):void{
                fileUpload.JSessionId = argId;
            }
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