FlashPlayer 10 and loading AVM1 content

November 20th, 2008 • AIR, ActionScript, Flash

I’m using some swf assets directly exported from Illustrator CS3. You can export Flash 9 swfs, but as you can’t add any code there you will always get AVM1 content (AS2.0). So it’s basically just an information in the header and maybe Adobe will put an option in the export-settings to actually publish AVM2 swfs. I haven’t tried CS4 so far, maybe it’s in there already?!
Anyway, loading this swfs and moving it to another part of the displayList didn’t cause any problems using FlashPlayer 9. In FlashPlayer 10 I get the runtime error 2180:

Error #2180: It is illegal to move AVM1 content (AS1 or AS2) to a different part of the displayList when it has been loaded into AVM2 (AS3) content.

There are a few options to avoid this error:

• Don’t load AVM1 content respectively create the assets in Flash to get AVM2 swfs
• Don’t move the assets in a different part of the displayList
• Change the SWF header on-the-fly

The last solution seemed to be perfect and remembering the AVM2Loader class someone created in the upcoming AS3 times it was the easiest solution without changing the workflow. Even if the author Fladdict removed the class, you can still find it on the internet at Troy Gardners blog.

Update 20.11.2008

To use this workaround in an AIR application you have to set allowLoadBytesCodeExecution = true in your LoaderContext otherwise you aren’t allowed to load the bytes of the swf.

...
var loader:Loader = new AVM2Loader();
var loaderContext:LoaderContext = new LoaderContext();
loaderContext.allowLoadBytesCodeExecution = true;
loader.load("file.swf", loaderContext);
...

Tags: AIR, AS3, Flash

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