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 var bitmapData:BitmapData = new BitmapData(myCanvas.width, myCanvas.height);
 bitmapData.draw(myCanvas,new Matrix());
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       var loader:URLLoader = new URLLoader();
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                loader.load(request);
            }catch (error:Error) {
                Alert.show("ÉÏ´«Ê§°Ü");
            }
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      private function setSessionId(argId:String):void{
                fileUpload.JSessionId = argId;
            }
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