Is there a barcode scanner SDK that works with iPad 2?
I've tried RedLaser 3.0 (I have an account through them) and they don't have native iPad 2 app support... only iPhone apps run on the iPad 2 work. I also tried an iPad 2 hack of ZBar (open source) and although it works, it doesn't work very well.
Any other options out there?
ZBar is the best to use. There are a post about it. The unique difference of zbar to iphone and ipad is the screen size, so it is a "little native". But take in mind that the camera of IPad 2 is very bad.... The iPad 2 have 0.7 MP camera (back) and 0.4 MP (front), so will be dificult decode same symbols. It even didn't have autofocus. Only to say, the first iPhone have a 2.0 MP. (Today is 5.0 MP)
Test with a iPhone program in your iPad if it decode what you want (make no difference the result). If it work, be happy, if not, next year buy the iPad 3.
--Edit--
Now the ZBar suport iPad 2
Scandit SDK barcode scanner from Mirasense. Their latest version was updated to optimally support the iPad 2.
You might want to take a look at ScannerKit. It's available for both iOS and Android.
ScannerKit for iOS: http://shopsavvy.mobi/sdk/
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