AS获取SWF文件的宽和高!（实现如下类）

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AS获取SWF文件的宽和高!（实现如下类）2011-02-17 11:24package xzy.loadInfo{
        import flash.utils.*;
        import flash.errors.IOError;
        public class swfHanderInfo {
                protected var w_h_ruleList:Array;
                protected var _type:String;//标识
                protected var _version:uint;//版本
                protected var _size:uint;//文件大小
                protected var _width:uint;//场景宽
                protected var _height:uint;//场景高
                protected var _fps:uint;//桢频
                protected var _frames:uint;//场景上的桢数
                public function swfHanderInfo(BA:ByteArray) {
                        setWHruleList();
                        parseByteArray(BA);
                }

                protected function parseByteArray(BA:ByteArray):void {
                        var binary:ByteArray=new ByteArray;
                        binary.endian=Endian.LITTLE_ENDIAN;
                        BA.readBytes(binary,0,8);//取前8个字节,包括了是否是swf,版本号,文件大小
                        _type=binary.readUTFBytes(3);//前3个字节是SWF文件头标志，FWS表示未压缩，CWS表示压缩的SWF文件
                        _version=binary[3];//第4个字节为版本号
                        _size=binary[7]<<24|binary[6]<<16|binary[5]<<8|binary[4];//文件大小按照8765字节的顺序排列的16进制
                        //trace(_size,":size");
                        //trace(_version,":version");
                        binary.position=8;//移到第9个字节位置，从这里开始就是swf 的控制码区和宽高数据区,宽高最多占用9个字节
                        var mainData:ByteArray=new ByteArray;
                        BA.readBytes(mainData);
                        if (_type == "CWS") {//未压缩的swf标识是FWS，压缩过的swf标识是CWS
                                mainData.uncompress();//从第9个字节起用解压缩
                        } else if (_type != "FWS") {
                                //trace("..."+_type+"...")
                                throw new IOError("出错:不是swf文件！");
                        }//不是cws,也不是fws,表示不是swf文件，抛出错误！
                        binary.writeBytes(mainData,0,13);//再写13个字节，这里包括了swf的桢速/桢数
                        //当前第8个字节位为控制码
                        var ctrlCode:String=binary[8].toString(16);
                        //trace(ctrlCode,":ctrlCode");
                        var w_h_plist:Array=getW_H_RulePosition(w_h_ruleList,ctrlCode);
                        var len=w_h_plist[2];
                        //trace("宽高占用"+len+"个字节");
                        var s:String="";//存储宽高数据的相关字节码
                        for (var i=0; i < len; i++) {
                                var _temp=binary[i + 9].toString(16);
                                if (_temp.length ==1) {
                                        _temp="0" + _temp;
                                }
                                s+= _temp;

                        }
                        //trace(s);
                        _width=new Number("0x" + s.substr(w_h_plist[0][0],4)) / w_h_plist[0][1];
                        _height=new Number("0x" + s.substr(w_h_plist[1][0],4)) / w_h_plist[1][1];//相应取值得到宽高
                        trace(width,":width");
                        trace(height,":height");
                        var pos=8+len;
                        _fps=binary[pos+=2];//宽高数据区完跳一字节位置就是fps值
                        //trace(_fps,":fps");
                        _frames=binary[pos+2]<<8|binary[pos+1];//桢数占两个字节，由低位到高位组成,是不是说时间轴的最大桢数就为65535?
                        //trace(_frames,":frames");
                }
                protected function setWHruleList():void {//存储宽高的数据
                        w_h_ruleList=[];
                        w_h_ruleList[0]={ctrlCode:"50",position:[[0,10],[5,10],5]};
                        w_h_ruleList[1]={ctrlCode:"58",position:[[1,40],[6,10],6]};
                        w_h_ruleList[2]={ctrlCode:"60",position:[[1,10],[7,10],6]};
                        w_h_ruleList[3]={ctrlCode:"68",position:[[2,40],[8,10],7]};
                        w_h_ruleList[4]={ctrlCode:"70",position:[[2,10],[9,10],7]};
                        w_h_ruleList[5]={ctrlCode:"78",position:[[3,40],[10,10],8]};
                        w_h_ruleList[6]={ctrlCode:"80",position:[[3,10],[11,10],8]};
                        w_h_ruleList[7]={ctrlCode:"88",position:[[2,40],[12,10],9]};
                }
                protected function getW_H_RulePosition(list:Array,str:String):Array {
                        for (var i in list) {
                                if (list[i].ctrlCode == str) {
                                        break;
                                }
                        }
                        return list[i].position;
                }
                /**
                * Public methods
                */
                public function toString():String {
                        return "[type:" + _type + ",version:" + _version + ",size:" + _size + ",width:" + _width + ",height:" + _height + ",fps:" + _fps + ",frames:" + _frames + "]";
                }
                /**
                * Public get methods
                */
                public function get type():String {
                        return _type;
                }
                public function get version():uint {
                        return _version;
                }
                public function get size():uint {
                        return _size;
                }
                public function get width():uint {
                        return _width;
                }
                public function get height():uint {
                        return _height;
                }
                public function get fps():uint {
                        return _fps;
                }
                public function get frames():uint {
                        return _frames;
                }
        }
}

应用：

//上面这个类可以直接复制过去就能用
//然后比如你要加载的swf地址为“www.a.com/a.swf”
package 
{

        import com.ycccc.swfLoader.swfHanderInfo;
        //import xzy.loadInfo.swfHanderInfo
        import flash.events.Event;
        import flash.utils.ByteArray;
        import flash.display.Loader;
        import flash.net.URLRequest;
        import flash.net.URLLoader;
        import flash.display.MovieClip;
        import flash.display.Shape;
        import flash.net.URLLoaderDataFormat


        public class Main extends MovieClip
        {
                private var swfInfo:swfHanderInfo;
                private var urlloader:URLLoader=new URLLoader();
                private var loader:Loader=new Loader();
                public function Main()
                {
                        // constructor code
                        loader.contentLoaderInfo.addEventListener(Event.COMPLETE,loader_complete);
                        urlloader.dataFormat = URLLoaderDataFormat.BINARY;
                        urlloader.addEventListener(Event.COMPLETE,swf_loaded);
                        urlloader.load(new URLRequest("http://zqbbs.netsh.com/usr/12/12_191_15.swf"));
                }
                private function swf_loaded(e:Event):void
                {
                        swfInfo = new swfHanderInfo(ByteArray(urlloader.data));
                        trace("宽度："+swfInfo.width,"高度:"+swfInfo.height);
                        loader.loadBytes(urlloader.data);
                }
                private function loader_complete(e:Event):void
                {
                        var mc:MovieClip=new MovieClip();
                        var rect:Shape=new Shape();
                        rect.graphics.beginFill(0xFFFFFF);
                        rect.graphics.drawRect(0,0,swfInfo.width,swfInfo.height);
                        rect.graphics.endFill();
                        mc.addChild(rect);
                        mc.mask = rect;
                        mc.addChild(loader);
                        addChild(mc);
                        //至于具体的位置你自己计算吧，也就是mc的位置
                }
        }

}
 

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