We use MD5 and understand the issue completely. We use classes that look at the file a chunk at a time as we don't want to load 60+MB MP4 files into a ByteArray. Our solution did help in keeping the general memory overhead under control. The issue becomes one of time as although our Air client can usually bring a large file down in a reasonable amount of time (let's say 1-3 or so minutes for a broadband connection) the sticky point is the MD5 typically ate another 2+ minutes to complete. Likewise hoping to implement a progress indicator, MD5 (or any CRC like mechanism) is processor heavy leaving you with the challenge the balance of running an animation at the same time you want your processor to be handling your check with the more animation, the slower your CRC will be.
If your mention of Asynchronous means you want this to run on its own thread, then you need to realize that the Flash Player is single threaded (but read about HTTP traffic). KFB From: [email protected] [mailto:[email protected]] On Behalf Of nathanpdaniel Sent: Friday, January 02, 2009 2:03 PM To: [email protected] Subject: [flexcoders] Creating Asynchronous Classes Is there a "primer" on creating asynchronous classes? I've been building an app that runs a CRC32 check on each file (which requires looking at every byte of every file). It doesn't cause issues when the files are small text files, but when they're 40mb video files, the app hangs till complete. I want the app to be able to update other things while waiting on the CRC32 functionality completes. Actually, all I need is some visual progress indicator (some way to update the display). Anyone with any suggestions! I'm all ears! :D -N. D.
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