Handle VerifyError: Error #1014 when loading swfs using AS3

Question

We are making a system that has a main swf for the application, and loads separate tools from separate swfs -- there will be versioning issues in the future since the s

Answer 1

The best way to do this is by using one of the libraries bhups suggested. I used senocular's 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.

The next example lists all the class names from a loaded SWF:

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

   }
  }
 }

}