Get Building iPhone OS Accessories: Use the iPhone Accessories PDF

By Ken Maskrey

ISBN-10: 1430229314

ISBN-13: 9781430229315

This booklet offers a significant, in-depth examine Apple’s exterior accent Framework and the iPhone add-ons API. You’ll find out how to create new, built-in suggestions that mix iPhone apps with committed hardware.

The iPhone OS add-ons API expands the possibilities for leading edge iPhone builders, permitting you to regulate and display screen exterior units, even if you’ve outfitted them your self or received them from a 3rd party.

What you’ll learn

  • Develop components and apps for the iPhone and iPod contact.
  • Use Apple’s exterior accent Framework to create hardware/software interplay.
  • Control and display screen exterior units utilizing the iPhone components API.
  • Use the explicit controller sessions in the iPhone OS SDK.
  • Build and keep an eye on your individual accent.
  • Get your components licensed via Apple’s AE software.

Who this e-book is for

This booklet is for iPhone and iPod contact builders who are looking to write apps to regulate exterior components and builders who are looking to create components for iPhone and iPod contact. This contains embedded platforms programmers who've been passed over of the iPhone gold rush until eventually now.

The iPhone OS add-ons API expands the industry of iPhone builders once more, and this e-book is for all these builders desirous to use those new APIs to regulate and computer screen exterior device—whether self-built or bought from different sources.

Table of Contents

  1. Accessory Overview 
  2. EAAccessory Framework  
  3. EA Framework layout Patterns  
  4. The online game Controller  
  5. Specifying a Pong Game  
  6. Coding a Pong Game  
  7. Adding the sport Controller 
  8. Improving the layout 
  9. Apple Developer Programs  
  10. Hardware layout 
  11. Firmware 
  12. Everything Else 

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Extra info for Building iPhone OS Accessories: Use the iPhone Accessories API to Control and Monitor Devices

Example text

And that is correct. The problem is that the EA framework uses another definition of protocol. What’s worse is that the EA framework actually uses both definitions of protocol. First, let’s make sure you understand Cocoa’s use of protocols. Protocols provide a mechanism for objects to communicate with each other. This interprocess communication comes about through the use of Objective-C messages. The UIApplication Delegate protocol fits the bill as the most common and frequently used protocol. It’s one you see in almost any app you build.

Depending on what eventCode was received you take one of several actions. But first, you need to create the streams and that is done in three steps for each (input and output) stream. This is where you use the if (session) statement. if (session) { [[session inputStream] setDelegate:self]; [[session inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [[session inputStream] open]; [[session outputStream] setDelegate:self]; [[session outputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [[session outputStream] open]; } else { NSLog(@"creating session failed"); } Most likely, you will include the preceding code within your method that handles the opening of the EASession.

At eight bits per byte this gives you 256 possible commands; plenty more than the handful you need. So what is the additional information? Let’s consider the command to turn on an LED. In actuality, you need to be able to turn the LED on or off. You could have a command for each or you could have a single command with a parameter to say whether you want the LED to turn on or off. Similarly, if you had multiple LEDs on the accessory, you might have an additional information field that tells you which LED to command.

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Building iPhone OS Accessories: Use the iPhone Accessories API to Control and Monitor Devices by Ken Maskrey


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