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4.1 Introduction
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The Macintosh GUI-based interface and programs abstract users from the low-level aspects of operating the computer. For most users, this is a good thing. One of the primary strengths of the Macintosh platform is its elegant, consistent, and aesthetically pleasing interface and user experience, which shields users from the low-level details of interacting with the operating system. This design has affected how Macintosh developers design software and how Macintosh users operate and interact with their programs. Typically, Macintosh applications are self-contained entities that encapsulate several features within one program, encouraging users to operate and use each
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Introduction
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program in relative isolation. You can use programs in succession through native scripting languages such as AppleScript, but not in the way to which UNIX users are accustomed. UNIX takes a different approach, founded on the tenets of the UNIX philosophy: use and design simple programs with clean and clear interfaces that do one thing well and that can be linked together to do powerful things. And by all means, do not get in the user s way. This is no surprise the original designers of UNIX were programmers writing a system for themselves and other programmers, and their goal was to support program development and text processing. This approach has changed somewhat over the years, but for most UNIX users, the command line is the preferred interface. For Macintosh developers and users, the command line is not a user interface. Software development on UNIX and the Macintosh platforms is also different. On the Macintosh, development centers on an Integrated Development Environment (IDE) composed of an integrated editor, compiler, linker, and debugger. UNIX, on the other hand, offers a more segregated development environment, centering on makefiles and command-line build and editing tools. These examples are generalizations, but they convey the main differences between the environments. Like most things, each environment has its strengths and weaknesses and, in many respects, is a reflection of the system designers and user base. The beauty of Mac OS X is that it blends the best of both worlds. If you like, you can use the system as a UNIX box through its command-line interface, or operate it as a standard Macintosh using the GUI interface. Software developers also have many choices in terms of the APIs and frameworks they can use to build programs. You can develop Mac OS X GUI programs under Cocoa, Java, or AppleScript using the Mac OS X APIs and frameworks, or develop UNIX textbased applications from the command line with familiar UNIX development tools (emacs, gcc, gdb). You can even write X Window programs, although doing so is not recommended because Mac OS X offers a more appealing GUI-based application infrastructure through Cocoa and Carbon. An interesting approach combines different programs by writing your interface in Cocoa and the program guts as a command-line tool. This approach makes sense for many applications and is becoming popular among Mac OS X software developers. For UNIX developers coming to Mac OS X, this is a useful path; it enables them to develop their core application in a familiar environment with known tools and techniques, while making it available to many Macintosh users who would otherwise shy away from the command line. In addition, you can run the program without its user interface and even port it to other platforms. You also
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have infinite opportunity to quickly write simple interfaces for the standard UNIX tools that come with the system. The technique is discussed in detail in chapter 6, Cocoa programming. Before continuing with this chapter, see appendix A for information about getting and installing Apple s Mac OS X development tools.
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