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Cable (from a cable set-top box or directly) Satellite (from a satellite receiver box) Antenna (over-the-air television signal)

Although CFRetain() and CFRelease() are functionally identical to -[NSObject retain] and -[NSObject release], you can t use the Objective-C messages to retain and release Core Foundation types in a garbage collection environment. Remember that the Objective-C messages -retain and -release are disabled when the garbage collector is started. So while CFRetain() and CFRelease() continue to function, -retain and -release do nothing.

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In a managed memory environment, Core Foundation and Objective-C share the same reference counting mechanism. In this environment, CFRetain() and CFRelease() are synonymous with -[NSObject retain] and -[NSObject release]. The simplest way of dealing with a retained Core Foundation type is to immediately add it to the autorelease pool. If the -uuid method in Listing 25-2 were written for a managed memory environment, it would look something like the code in Listing 25-3. Listing 25-3. Returning an Autoreleased Core Foundation Reference - (NSString*)uuid { CFStringRef cfString = CFUUIDCreateString(kCFAllocatorDefault,uuid); return [(NSString*)cfString autorelease]; } The object returned by -uuid in Listing 25-3 is autoreleased and behaves like any other autoreleased string object. Most managed memory patterns described in 24 apply equally to Core Foundation types.

If you have cable television and use a set-top box, you ll want to connect the set-top box television output to your Windows Vista PC

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Electric lighting has brought about a significant improvement in the standard of living for millions of people all over the world The availability of bright, instantly available illumination has made it possible for people to read, write, and do intricate work more effectively during the nightime hours, without concern for the fire hazards of open flames in fireplaces or from lamps fueled by coal gas, whale oil, or kerosene It also made homes more secure and streets safer to travel after dark The first electric power stations were built in cities in the United States and England to extend the benefits of electric lighting to the general public More than 100 years later, more electricity is still consumed for lighting than for any other purpose Incandescent lamps have long been the dominant light sources, but that dominance is being challenged by halogen and fluorescent lamps The halogen lamps offer more intense and natural-appearing light, while the newer fluorescent lamps consume less power for equivalent illumination, have far longer lives, and also provide cooler, more natural light This chapter describes, illustrates, and explains the most popular light sources as well as the high-intensity discharge (HID) lamps An extensive table gives the leading features of popular examples of all of these lamps Other topics discussed in this chapter include the different types and styles of light fixtures (now called luminaires), and the principles of home lighting design for each room Suggestions for obtaining the most cost-effective illumination are given, and various methods are described for calculating recommended illumination levels for each room Useful formulas for making those determinations are included Other topics in the chapter are the installation of lighting in and around swimming pools and fountains, general 120-V outdoor lighting, and low-voltage lighting for lawns and gardens A glossary of illumination terms at the end of the chapter defines many words and phrases associated with electric lighting for ready reference.

Summary

CHAPTER 4:

Invoking C functions from Objective-C is effortless, giving your code direct access to a universe of C-based solutions. Working with Core Foundation types is made easier by the toll-free bridge, allowing you to interact with many Core Foundation types as though they were Objective-C objects. The most common programming issue to deal with is matching, or rectifying, the memory management styles of the two languages.

Figure 3-2 is a diagram of a conventional (core-type) single-phase transformer It shows two independent coils or windings, the primary and secondary, wound on a closed-ring core made from a stack of laminated sheet steel

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