AS获取SWF文件的宽和高!（实现如下类）

主页博客相册|个人档案 |好友   查看文章    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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