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Cocoa is an object-oriented development environment available in Apple's Mac OS X environment. Mac OS X, a unified operating system and graphical operating environment, is the fastest growing Unix variant on the market today. Hard-core Unix programmers, developers who cut their teeth on classic Mac operating systems, and developers who cherished NeXTSTEP, the decade-old system on which today's Cocoa is based -- all are flocking to Cocoa, and they need a lot more practical information than is currently available from Apple. There is a lot to learn. Building Cocoa Applications is an ideal book for serious developers who want to write programs for the Mac OS X using Cocoa. It's a no-nonsense, hands-on text that's filled with examples -- not only simple and self-contained examples of individual Cocoa features, but extended examples of complete applications with enough sophistication and complexity that readers can put them to immediate use in their own environments. Building Cocoa Applications takes a step-by-step approach to teaching developers how to build real graphics applications using Cocoa. By showing the basics of an application in one chapter and then layering additional functionality onto that application in subsequent chapters, the book keeps readers interested and motivated. Readers will see immediate results, and then go on to build onto what they've already achieved. The book is divided into four major parts: Part I introduces the Mac OS X graphical user interface (Aqua) from a developer's point of view, Cocoa developer tools (such as the Interface Builder, Project Builder, and gdb debugger), object-oriented concepts, the Objective-C language in which Cocoa is written, and the basics of Cocoa programming itself. Part II focuses on building the first complete application, Calculator, a simple four-function calculator. The chapters in this part of the book extend the application, piece by piece, by introducing such features as nibs, icons, delegation, resizing, events, and responders. Part III focuses on building an application called MathPaper, which is similar to a word processor but which instead solves mathematical expressions the user supplies. The chapters in this part of the book extend MathPaper by developing both the front and back ends using a variety of Cocoa classes and methods. They introduce Cocoa'sdocument-based architecture, tasks, pipes, Rich Text format, handling document files, and using Quartz to draw in windows. Part IV focuses on building the GraphPaper application, a more complex multithreading application that graphs mathematical functions in multiple dimensions and that uses mouse-over capabilities to identify graph points. The chapters in this part of the book add more advanced Mac OS X features such as multithreading, color, mouse events, zoom buttons, pasteboards, services, preferences, and the defaults database. By the end of the book, readers who have built the applications as they have read will have a solid understanding of what it really means to develop complete and incrementally more complex Cocoa applications. The book comes with extensive source code available for download from the O'Reilly web site, along with an appendix listing additional resources for further study.