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CHAPTER 1 AN INTRODUCTION TO REALBASIC Note The term BASIC stands for Beginners All-Purpose Symbolic Instruction Code. BASIC was created in 1963 at Dartmouth College. Using REALbasic, programmers create stand-alone applications. Stand-alone, in this instance, means that once written and compiled, an application can run natively on the OS for which it was created. Nothing else is required. Compiling is the process of translating programming statements into a format that can be executed on a particular OS. REALbasic is made up of a graphical integrated development environment (IDE), an object-oriented programming language, a debugger, and a cross-platform compiler, as Figure 1-1 shows. REALbasic provides a powerful collection of tools that any professional software developer can appreciate. At the same time, first-time programmers and computer hobbyists will find that REALbasic is easy to learn and fun to work with. Figure 1-1. The REALbasic IDE, as shown on Windows
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CHAPTER 1 An Introduction to REALbasic REALbasic is a cross-platform programming language designed to facilitate the creation of software applications that run on Macintosh, Windows, and Linux. REALbasic is a great tool for developing commercial software. It is also an excellent choice to learn as a first programming language. A great deal of time and effort has gone into making REALbasic both powerful and easy to use. In this chapter, you get an overview of what REALbasic is and the kinds of things you can do with it. You also get to see how REALbasic stacks up against competing application development tools that run on Macintosh and Windows. Finally, you jump right in and get your feet wet through the development of your first REALbasic application. Through the creation of your first REALbasic application, you Get a introduction to components that make up a REALbasic application Learn the steps involved in building a REALbasic application Get the chance to compare REALbasic to other application development tools and programming languages Learn how to compile a REALbasic application to run on different operating systems(OSs) Overview of REALbasic REALbasic is a software development tool that provides programmers at all levels with everything they need to create just about any kind of software application you can think of. This includes everything from major enterprise applications to small personal utility programs or even computer games. With REALbasic, the name of the game is cross-platform software development. What this means is that REALbasic enables programmers to create and deploy software applications that can run on different OSs, including Macintosh, Windows, and Linux. REALbasic is an object-oriented implementation of the BASIC programming language. REALbasic is also a visual programming language, meaning you visually create your REALbasic application s graphical user interface (GUI) by dragging-and-dropping prebuilt controls onto windows generated by REALbasic. The graphical user interface is the part of the application that the user sees and can interact with using the mouse and keyboard.
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PART 1 Introducing REALbasic PART 1 Introducing REALbasic
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xxiv INTRODUCTION Part 2: Learning How to Program with Realbasic This section consists of six chapters, each of which addresses a specific programming topic. These topics include interface development, menu development, storing and retrieving data, conditional logic, loops, and object-oriented programming. Part 3: Advanced Topics The Advanced Topics section, which is made up of four chapters, covers processing files, creating and accessing databases, and working with graphics and audio. Part 4: Appendixes This section is made up of three appendixes that address porting a Visual Basic application over to REALbasic, the contents of the book’s CD-ROM, and different resources available to you as you continue learning about REALbasic. Conventions Used in This Book One of the goals I had in writing this book was to make it as clear and easy to understand as possible. Throughout the book, you will find a number of special elements designed to make reading and working with the presented material easier. The following provides a quick review of these special elements. Tip Tips are suggestions that point out different ways of accomplishing tasks or helping you to work more efficiently and effectively. Note Notes are designed to provide you with additional information about a topic being discussed or to bring additional emphasis to a particular point. SIDEBAR Sidebars are designed to provide you with information that, while not necessarily essential to the topic being discussed, is still important and worth learning. Sidebars are also used to identify real-world situations where REALbasic can be applied.
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INTRODUCTION xxiii programmers in making the jump over to cross-platform development using REALbasic. It accomplishes this goal by pointing out key differences between the two programming languages where appropriate throughout the book. At a minimum, you need a good understanding of at least one of the OSs that REALbasic runs on (Macintosh, Windows, or Linux). So, whether you are new to programming or an experienced programmer eager to make the transition to cross-platform application development, this book can help you reach your goal. What You Need to Begin REALbasic supports cross-platform application development, meaning you can use it to create applications that can be run on Macintosh, Windows, and Linux. To demonstrate and reinforce REALbasic s cross-platform development capabilities, this book was written using versions of REALbasic that run on all three of these OSs. Therefore, you will see figures and examples of applications running on any combination of these OSs. Except where specifically noted, all the applications you learn how to create in this book run equally well on each OS. Because of differences in how each OS is designed, however, you may notice small differences in the appearance of certain application features. I make every effort to point out where differences occur and to ensure that the examples presented work equally well on Macintosh, Windows, and Linux. If you do not already have a copy of REALbasic installed on your computer, we have provided Macintosh, Windows, and Linux trial versions on the book s accompanying CD, along with the source code for all the examples featured in the book. Once you have REALbasic installed, you are prompted to enter a license key when you start it up. If you purchased REAL- basic online, you receive your license key via e-mail. If you did not purchase REALbasic online, you are prompted to automatically request a demo key via your Internet connection. This enables you to try REALbasic free for ten days. Once this is done, you are ready to go. Along with this book, we provide everything you need to begin developing world-class software applications for Macintosh, Windows, and Linux! How This Book Is Organized Beginning REALbasic is organized into four parts. Beginning REALbasic is designed to be read sequentially from cover-to-cover. However, more experienced programmers and programmers with previous BASIC programming experience may want to use this book by reading the first few chapters, and then skipping around and selecting the chapters that interest them the most. Part 1: Introducing REALbasic This section is made up of two chapters that are designed to provide you with a solid introduction to REALbasic and its integrated development environment.
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Introduction Welcome to Beginning REALbasic! REALbasic is a programming language that provides you with everything you need to create software applications that can run on Macintosh, Windows, and Linux. REALbasic is an extremely powerful programming language that is capable of creating world-class software. Yet, at the same time, REAlbasic is easy to learn and makes a perfect programming language for first-time programmers. Using REALbasic, you can create applications, utility programs, and computer games. If you are a Windows programmer, REALbasic provides you with all the tools you need to write just about any Windows application imaginable: the same goes for Macintosh and Linux programming. By supporting cross-platform application development, REALbasic significantly enhances your ability to distribute your applications. This means you can share your work with more friends and colleagues, and if you are in the business of developing commercial software, REALbasic can help you attract new consumer markets. Why REALbasic? Plenty of programming languages are available today that are similar to REALbasic in many aspects. On any given operating system (OS), they may come close to matching REALbasic s core set of features. However, none of the other major modern programming languages based on the Basic programming language support application development on all three major desktop OSs. This makes REALbasic unique and gives REALbasic programmers a competitive advantage over other programmers. As far as modern programming languages go, REALbasic is easy to learn, yet it is every bit as powerful and full featured as any other modern programming language. So, whether you are a student, a hobbyist, or a professional programmer, REALbasic has something to offer you. REALbasic programmers are supported by a thriving user community and an array of third- party developer support. This means you won t have any trouble finding help or locating companies that do REALbasic software development. Unlike other programming languages, REALbasic does not require a complex framework to execute. And, unlike Visual Basic .NET, REALbasic applications can run on older versions of Windows, such as Windows 95 or 98, where the .NET Framework is not installed. REALbasic is not restricted to a particular OS. In short, REALbasic is a modern, powerful, cross-platform, object-oriented programming language that is friendly to beginners, yet powerful enough to satisfy the most demanding programmers needs. Who Should Read This Book? The primary purpose of this book is to teach you how to develop applications using REALbasic that can run on Macintosh, Windows, and Linux. Previous programming experience is not required, although it certainly is helpful. This book is also designed to assist Visual Basic
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Acknowledgments This book represents the hard work and efforts of numerous individuals. I would like to thank Chris Mills, who served as the book s lead editor, for working so hard and for providing me with the opportunity to write this book. Special thanks go out to Allan Kent, the book s technical reviewer, for offering countless ideas and suggestions that helped make this a much better and stronger book. I would also like to thank Marcia Baker, the book s copy editor, for her dedication and professionalism, and for her patience in dealing with and fixing my many typos and grammatical errors. I also want to acknowledge and thank Richard Dal Porto, the project manager, for keeping me on schedule and making sure I didn t forget to tie up any loose ends, and Lori Bring, the book s production editor, for guiding this book through its final stages. Finally, I d like to thank everyone else at Apress for all their hard work.
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