iPhone External Accessory Programming Exercises
Here you will find, step-by-step, how you can write iPhone or iPod Touch code, in Objective-C 2.0, to access an external accessory. You will do so by using the ExternalAccessory Framework.
The ExternalAccessory Framework, introduced with iPhone OS 3.0, provides a set of classes so that iPhone and iPod Touch applications can find, and communicate with, external accessories.
An external accessory is a device external to the iPhone or iPod Touch. The external accessory connects to the
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