I had this working for most part, retrieving and displaying the images
from Flickr, but BitmapData.draw was always throwing a security sandbox
violation when I needed to hide the canvas the Flickr images were
displayed in. Karl Johnson has written more about it here:
http://www.cynergysystems.com/blogs/page/karljohnson?entry=working_around_security_sandbox_errors
The problem is that the crossdomain.xml is at
http://api.flickr.com/crossdomain.xml, but the actual images are pulled
from http://farm1.static.flickr.com/... So running the app, I am seeing
an error:
Failed to load policy file from
http://farm1.static.flickr.com/crossdomain.xml
We're obviously not loading the crossdomain.xml from the right place, as
there is no crossdomain.xml at that location.
Next, I looked closer at James Ward's example of using Ely's
DisplayShelf component to retrieve images from Flickr:
http://www.jamesward.org/wordpress/2006/11/06/flex-widgets-from-widgetslive/
The AppDom and SecDom approach is taken from Ely's DisplayShelf
component, where he uses it with the SWFLoader. May not be needed for
images, I simply just left it in there.
I've taken a second look at Jame's write-up and he's posted a follow-up
in the comment section on April 20, 2007 where he's showing a proxy
setup to get around the issues at hand. His example wouldn't work either
until the proxy setup was in place.
This may be what I have to do as well. It's just amazing to me that
there is no unified approach to this. I agree with you, either you have
access permission to the images, or you don't.
Jurgen
Alex Harui wrote:
I'm not clear that AppDom and SecDom affect loading images (JPG, GIF,
etc). You either have permission from the crossdomain.xml at
flickr.com or you don't.
You can almost always load it, you just can't always access its pixels.
------------------------------------------------------------------------
*From:* [email protected] [mailto:[EMAIL PROTECTED]
*On Behalf Of *Jurgen Beck
*Sent:* Friday, May 25, 2007 3:34 PM
*To:* [email protected]
*Subject:* [flexcoders] Flickr - Issue with LoaderContext
I'm running into security sandbox violation issues trying to load images
from a Flickr account.
Since the Image component derives from SWFLoader I am setting the
LoaderContext before the image source is assigned. The image component
is used inside my custom component, which in turn is used as an
itemRenderer in a TileList.
Here is the image component code fragment:
<mx:Image id="imgThumbnail"
source="{data.url}"
initialize="imageInit()"
width="75" height="75"/>
Here is my imageInit() method:
private function imageInit():void {
loaderContext = new LoaderContext();
loaderContext.applicationDomain =
ApplicationDomain.currentDomain;
loaderContext.securityDomain =
SecurityDomain.currentDomain;
loaderContext.checkPolicyFile = true;
imgThumbnail.loaderContext = loaderContext;
}
I've traced through the processes and the LoaderContext is definitely in
place before the image source gets assigned, so I should be good.
However, the application is still returning a security sandbox violation
error stating that the connection to
http://farm1.static.flickr.com/... <http://farm1.static.flickr.com/...>
was halted - not permitted from [my server].
This obviously should be working fine. Looking through Ely's
DisplayShelf component, there are no such issues. So the question is
what else is missing.
Anyone with some thoughts?
Thanks,
Jurgen
