Read Image XMP Metadata

hi all,

hope i'm not spamming  thread mailbox felt question asked in unrelated  forum.

 

question: can read image meta data flex ?

 

i tried xmp core library , passed jpeg file xmpmeta object :

private function getimagemetadata(jpeg:file):void                     {                                  var meta:xmpmeta = new xmpmeta(jpeg);                               var packet:xml = meta.serializetoxml();                               var photoshop:namespace = xmpconst.photoshop;                               var value:string = meta.photoshop::authorsposition;                                 trace(value); // returns null, not sure why                     } 

 

can 1 me image metadata.

 

thanks in advance

mac

i've got content related issue net still won't solve problem

 

private function init():void {

 

                                        var ldr:loader = new loader();

                                        ldr.contentloaderinfo.addeventlistener(event.complete, imgloaded);

  var s:string = "my/jpgpath/myjpgname.jpg";

                                        ldr.load(new urlrequest(s));

 

                              }

 

 

                              private function imgloaded(e:event):void{

 

                                        var info:loaderinfo = e.target as loaderinfo;

                                        var xmpxml:xml = getxmp(info.bytes);

 

  //trace(xmpxml);

                                        var meta:xmpmeta = new xmpmeta(xmpxml);

  //var packet:xml = meta.serializetoxml();

                                        var photoshop:namespace = xmpconst.photoshop

                                        trace(meta.photoshop::authorsposition);

 

 

                              }

                              private function trim(s:string):string{

  return s.replace( /^([\s|\t|\n]+)?(.*)([\s|\t|\n]+)?$/gm, "$2" );

                              }

                              private function getxmp(ba:bytearray):xml{

                                        var lp:bytearray = new bytearray();

                                        var packet:bytearray = new bytearray();

                                        var l:int;

 

                                        ba.readbytes(lp, 2, 2);

                                        /*

                                        http://www.adobe.com/devnet/xmp.html

                                        read part 3: storage in files.

 

                                        that explain -2 -29 , other things see here.

                                        */

                                        l = lp.readint() - 2 -29;

                                        ba.readbytes(packet, 33, l);

                                        var p:string = trim(encode(packet) as string);

  var i:int = p.search('<x:xmpmeta xmlns:x="adobe:ns:meta/"');

  /* delete in front of xmp xml */

                                        p = p.substr(i);

                                        /*

                                        for reason left rubbish in front, i'll hardcode out

 

                                        todo clean up

                                        */

 

                                        var ar:array = p.split('<');

                                        var s:string = "";

                                        var q:int;

                                        var j:int = ar.length;

                                        for(q=1;q<j;q++){

                                                  s += '<'+ar[q];

                                        }

                                        i = s.search('</x:xmpmeta>');

                                        i += ('</x:xmpmeta>').length;

                                        s = s.slice(0,i);

  /* delete behind xmp xml */

                                        return xml(s);

                              }

 

                              private static function encode(ba:bytearray):string {

  var origpos:uint = ba.position;

  var result:array = new array();

 

   for (ba.position = 0; ba.position < ba.length - 1; )

   result.push(ba.readshort());

 

  if (ba.position != ba.length)

   result.push(ba.readbyte() << 8);

 

  ba.position = origpos;

                                                  return string.fromcharcode.apply(null, result);

                              }

 

 

it seems there bug in xmpmeta class throws exception "the xmpmeta object cannot have qualifiers", created default (no param).

 

does have clue on this? please help

 

thanks

mac

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