By Ken Maskrey
Impressive! great excited to determine an add-ons e-book pop out. The ExternalAccessoriesFramework has been a sound asleep monstrous for a 12 months now looking ahead to sufficient momentum to truly escape. i'd fairly like to see a neighborhood of MFi businesses freeing add-ons with publicly on hand EA Protocols for any iPhone developer. i will absolutely see a way forward for one MFi corporation liberating a product that thousands of apps/ app builders may possibly use.
Get a leap at the components gold rush (okay gold rush is inaccurate, perhaps gold trickle) and turn into a grasp of the exterior add-ons framework. i have never accomplished the ebook but. i am simply large excited that Apress has an add-ons booklet to be had now!
Read or Download Building iPhone OS Accessories: Use the iPhone Accessories API to Control and Monitor Devices (Books for Professionals by Professionals) PDF
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Additional resources for Building iPhone OS Accessories: Use the iPhone Accessories API to Control and Monitor Devices (Books for Professionals by Professionals)
27 28 CHAPTER 2: EAAccessory Framework Figure 2–4. The LED command packet structure For example, to turn off LED #2, you send the sequence 0x010202 from the iPhone to the accessory. Status information works basically the same, but in the opposite direction. Instead of a command byte, you might have a status byte that indicates one of several conditions. For the results of a start diagnostics command, you might have 0x01 to mean that the tests completed successfully, 0x02 to mean that the tests completed but something failed, or 0x03 to mean that the tests hung up and did not complete.
For example, UIKit provides the mechanisms for your application to communicate with the user via the iPhone’s touchscreen. The Audio Toolbox framework provides the tools needed to allow the application to use sound. Figure 2–1 illustrates the general structure of a framework. Note that a framework includes much more than the shared library that we tend to think of as being the framework itself. 21 22 CHAPTER 2: EAAccessory Framework Figure 2–1. A framework contains shared libraries as well as other elements in a directory structure.
You need not worry about whether the device is your Pong game controller or a server on the other side of the globe. The stream simply provides the communications path. Cocoa, Apple’s name for the complete collection of frameworks, APIs and all the stuff that makes up Mac OS and iPhone OS, defines three classes of streams. NSStream defines the interface and properties for all stream objects. It is the abstract class from which the other stream objects derive. NSInputStream and NSOutputStream are subclassed from NSStream and define a basic input and output behavior, respectively.