AS3.0 关于用URLLoader加载外部图片

很多人都想当然的直接用URLLoader加载外部图片然后通过byteArray去转化成bitmap，其实也是可行的，但是出问题几率也会大很多。

我推荐一个比较实用的方法用URLLoader以二进制的方式加载外部图片，获得URLLoader.data的ByteArray数据，再用Loader去加载，这时Loader.content就是一个bitmap了

以下是一个例子

[code]

package {

        import flash.display.Bitmap;

    import flash.display.Loader;

        import flash.display.MovieClip;

    import flash.display.Sprite;

    import flash.events.Event;

    import flash.filters.ConvolutionFilter;

    import flash.net.URLLoader;

    import flash.net.URLRequest;

        import flash.net.URLLoaderDataFormat;

        import flash.utils.ByteArray;

   

    public class Main extends Sprite{

        private var loader:URLLoader;

        public function Main():void{

            loadImage("image.jpg");

        }

        private function loadImage(_path:String ):void{

            loader = new URLLoader;

                        loader.dataFormat=URLLoaderDataFormat.BINARY ;

            loader.addEventListener (Event.COMPLETE , onImageLoaded);

            loader.load(new URLRequest (_path));

        }

        private function onImageLoaded(e:Event):void {

                        var _ba:ByteArray = e.target.data as ByteArray;

                        var _l:Loader = new Loader;

                        _l.contentLoaderInfo.addEventListener (Event.COMPLETE, onBytesLoaded);

                        _l.loadBytes(_ba);

            //-------------------

            loader.removeEventListener (Event.COMPLETE , onImageLoaded);

            loader = null;

        }

                

                private function onBytesLoaded(e:Event):void 

                {

                        var _bitmap:Bitmap = e.target.content as Bitmap;

                        trace(_bitmap.width, _bitmap.height );

                        addChild (_bitmap );

                        //

                        e.target.loader.contentLoaderInfo.removeEventListener (Event.COMPLETE, onBytesLoaded);

                }                

    }

}

[/code]