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“”
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(""));
}
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
}
}
}
