title: appcelerator titanium base64 encode blob objects
body: <p>I am developing a mobile (iphone/android) application using appcelerator titanium (sdk 1.6.2).
  At a certain point in the app the user choses an image that should be shown in an imageView, base64 encoded, then uploaded to my server.
  The problem is the success event of the photo gallery returns the selected image as a blob object and the Titanium.Utils.base64encode method only accepts string values!
  Is there any way to convert Titanium.Blob objects to strings?</p>
  
  <p>Here is the code snippet:</p>
  
  <pre><code>var imageView = Titanium.UI.createImageView({
  height:200,
  width:200,
  top:20,
  left:10,
  backgroundColor:'#999'
  });
  
  Titanium.Media.openPhotoGallery({
  
  success:function(event)
  {
      var cropRect = event.cropRect;
      var image = event.media;//blob object
  
      // set image view
      Ti.API.debug('Our type was: '+event.mediaType);
      if(event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO)
      {
          imageView.image = image;// this works
          var imgStr=Ti.Utils.base64encode(image);// doesn't work because 'image' has to be a string!, but how?
      }
      else
      {
  
      }
  
      Titanium.API.info('PHOTO GALLERY SUCCESS cropRect.x ' + cropRect.x + ' cropRect.y ' + cropRect.y  + ' cropRect.height ' + cropRect.height + ' cropRect.width ' + cropRect.width);
  
  },
  allowEditing:true,
  popoverView:popoverView,
  arrowDirection:arrowDirection,
  mediaTypes:[Ti.Media.MEDIA_TYPE_VIDEO,Ti.Media.MEDIA_TYPE_PHOTO]
  });
  </code></pre>
  
  <p>Thank you,</p>