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copied!<p>The best way to do this is by using one of the libraries bhups suggested. I used <a href="http://www.senocular.com/flash/actionscript/?file=ActionScript_3.0/com/senocular/utils/SWFReader.as" rel="nofollow noreferrer">senocular's</a> for the next example. Also, because the senocular's library provides only basic operations for the parsed SWF you may need the SWF Format Spec (adobe.com/devnet/swf/pdf/swf_file_format_spec_v10.pdf) to get the info you want out of the loaded SWF.</p> <p>The next example lists all the class names from a loaded SWF:</p> <pre><code>package swf { import flash.events.Event; import flash.net.URLRequest; import flash.net.URLStream; import flash.utils.ByteArray; import flash.utils.Endian; import swf.SWFReader; public class GetSWFInfo { private var swfInfo:SWFReader; public function GetSWFInfo() { var urlRequest:URLRequest = new URLRequest("theswf.swf"); var loader:URLStream = new URLStream(); loader.load(urlRequest); loader.addEventListener(Event.COMPLETE, onComplete); } public function onComplete(e:Event):void { var recivedByteArray :ByteArray = new ByteArray(); URLStream(e.currentTarget).readBytes(recivedByteArray); //create a new instance of SWFReader swfInfo = new SWFReader(); //readTag it's a callback function that will be called when a tag is read during the SWF parse process. //read more on tags in the SWF specification document swfInfo.tagCallback = readTag; //start parsing swfInfo.parse(recivedByteArray); } public function readTag(tag:uint, bytes:ByteArray):void { //76 it's the tag type for SymbolClass tag //read more in the SWF specification document if (76 == tag) { var classesArray:Array = new Array(); var symbolsNumber:uint = 0; var currentId:uint = 0; bytes.endian = Endian.LITTLE_ENDIAN; //read the symbols Number //again read more in the SWF specification document symbolsNumber = bytes.readShort(); bytes.position = 4; while (true) { var i:uint = bytes.position; //every string name ends with a null byte //again read more in the SWF specification document while(bytes[i] != 0) i++; var readAmount:uint = i - bytes.position; classesArray.push(bytes.readUTFBytes(readAmount)); //the last ID is always the base class Id, and it's 0 currentId=bytes.readUnsignedShort(); bytes.position++; if (currentId==0) { break; } } //this two should be equal trace(classesArray.length + 1);//the number of elements in the classesArray trace(symbolsNumber);//the number of classes retrived from the SWF //list the names var name:String; for each (name in classesArray) { trace(name); } //now you have an array with all the class names that you can use to compare } } } </code></pre> <p>}</p>

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