Practical Programming in Tcl/Tk is described as the "bible" for Tcl programmers. It is a guide to the Tcl/Tk programming language and GUI toolkit. This revision includes substantial updates to cover the new version 8.4-giving both an overview of the features, as well as details about every command in the language. The third edition, written on version 8.2, sold over 30,000 copies. Version 8.4 of Tcl - Tool Command Language-provides substantial updates to one of the most popular UNIX scripting languages. The latest release, includes the addition of a virtual filesystem (VFS), many additional programming widgets (spinbox, panedwindow, labelframe),and improved performance of about 20% over 8.3. The book provides a guide to the best ways to use the tooklit. It not only gives accurate details, but includes extensive examples that demonstrate the best way to use the toolkit. The authors are experts that have both developed the technology and used it to solve problems, so they have many valuable insights to relate to the readers.
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Despite its frequently obtuse syntax, Tcl/Tk enjoys a large and enthusiastic following. It's king of the world when it comes to building graphical user interfaces (GUIs) for C programs (particularly those running in X Windows environments), which is what the language originally was invented to do. Tcl/Tk (which is pronounced "tickle tee-kay," and which stands for "Tool Control Language/Toolkit" despite the abbreviation's unusual capitalization) is expanding its scope to encompass fields as diverse as voice scripting and molecular visualization. The latest edition of Practical Programming in Tcl and Tk, the fourth, offers an encyclopedic guide to Tcl/Tk that not only helps programmers solve problems, but enables them to conceive new applications for the language.
The new edition of Practical Programming in Tcl and Tk covers Tcl 8.4, particularly its versatile new Virtual File System (VFS) capabilities that allow you to include FTP sites and other remote directories in ordinary File Save and File Open interfaces. Further new coverage goes to Starkits, with which you can bundle Tcl/Tk programs for deployment, and some new Tk elements. Otherwise, the book is generally revised and improved with additional examples (the sample code has always been one of this book's main attractions) and intelligently laid-out keyword tables. It has a great lay-flat binding, too. This book (with John Ousterhout's Tcl and the Tk Toolkit) remains one of the two must-have Tcl/Tk books. --David Wall
Topics covered: The Tcl programming language and the Tk toolkit on which it most usually operates. Sections cover basic and advance programming techniques, specific aspects of Tk widgets, and extending the C library that defines Tcl. Copious examples make it easier to understand (and quickly employ) effective design strategies.From the Inside Flap:
Tcl stands for Tool Command Language — Tcl is really two things: a scripting language, and an interpreter for that language that is designed to be easy to embed into your application. Tcl and its associated graphical user-interface toolkit, Tk, were designed and crafted by Professor John Ousterhout of the University of California, Berkeley. You can find these packages on the Internet (as explained on page lii) and use them freely in your application, even if it is commercial. The Tcl interpreter has been ported from UNIX to DOS, Windows, OS/2, NT, and Macintosh environments. The Tk toolkit has been ported from the X window system to Windows and Macintosh.
I first heard about Tcl in 1988 while I was Ousterhout's Ph.D. student at Berkeley. We were designing a network operating system, Sprite. While the students hacked on a new kernel, John wrote a new editor and terminal emulator. He used Tcl as the command language for both tools so that users could define menus and otherwise customize those programs. This was in the days of X10, and he had plans for an X toolkit based on Tcl that would help programs cooperate with each other by communicating with Tcl commands. To me, this cooperation among tools was the essence of Tcl.
This early vision imagined that applications would be large bodies of compiled code and a small amount of Tcl used for configuration and high-level commands. John's editor, mx, and the terminal emulator, tx, followed this model. While this model remains valid, it has also turned out to be possible to write entire applications in Tcl. This is because the Tcl/Tk shell, wish, provides access to other programs, the file system, network sockets, plus the ability to create a graphical user interface. For better or worse, it is now common to find applications that contain thousands of lines of Tcl script.
This book was written because, while I found it enjoyable and productive to use Tcl and Tk, there were times when I was frustrated. In addition, working at Xerox PARC, with many experts in languages and systems, I was compelled to understand both the strengths and weaknesses of Tcl and Tk. Although many of my colleagues adopted Tcl and Tk for their projects, they were also just as quick to point out its flaws. In response, I have built up a set of programming techniques that exploit the power of Tcl and Tk while avoiding troublesome areas. This book is meant as a practical guide to help you get the most out of Tcl and Tk and avoid some of the frustrations I experienced.
It has been about 10 years since I was introduced to Tcl, and about five years since the first edition of this book. During the last several years I have been working under John Ousterhout, first at Sun Microsystems and now at Scriptics Corporation. I have managed to remain mostly a Tcl programmer while others in our group have delved into the C implementation of Tcl itself. I've been building applications like HTML editors, e-mail user interfaces, Web servers, and the customer database we run our business on. This experience is reflected in this book. The bulk of the book is about Tcl scripting, and the aspects of C programming to create Tcl extensions is given a lighter treatment. I have been lucky to remain involved in the core Tcl development, and I hope I can pass along the insights I have gained by working with Tcl.
As a scripting language, Tcl is similar to other UNIX shell languages such as the Bourne Shell (sh), the C Shell (csh), the Korn Shell (ksh), and Perl. Shell programs let you execute other programs. They provide enough programmability (variables, control flow, and procedures) to let you build complex scripts that assemble existing programs into a new tool tailored for your needs. Shells are wonderful for automating routine chores.
It is the ability to easily add a Tcl interpreter to your application that sets it apart from other shells. Tcl fills the role of an extension language that is used to configure and customize applications. There is no need to invent a command language for your new application, or struggle to provide some sort of user-programmability for your tool. Instead, by adding a Tcl interpreter, you structure your application as a set of primitive operations that can be composed by a script to best suit the needs of your users. It also allows other programs to have programmatic control over your application, leading to suites of applications that work well together.
The Tcl C library has clean interfaces and is simple to use. The library implements the basic interpreter and a set of core scripting commands that implement variables, flow control, and procedures (see page 22). There is also a set of commands that access operating system services to run other programs, access the file system, and use network sockets. Tk adds commands to create graphical user interfaces. Tcl and Tk provide a "virtual machine" that is portable across UNIX, Windows, and Macintosh environments.
The Tcl virtual machine is extensible because your application can define new Tcl commands. These commands are associated with a C or C++ procedure that your application provides. The result is applications that are split into a set of primitives written in a compiled language and exported as Tcl commands. A Tcl script is used to compose the primitives into the overall application. The script layer has access to shell-like capability to run other programs, has access to the file system, and can call directly into the compiled part of the application through the Tcl commands you define. In addition, from the C programming level, you can call Tcl scripts, set and query Tcl variables, and even trace the execution of the Tcl interpreter.
There are many Tcl extensions freely available on the Internet. Most extensions include a C library that provides some new functionality, and a Tcl interface to the library. Examples include database access, telephone control, MIDI controller access, and expect, which adds Tcl commands to control interactive programs.
The most notable extension is Tk, a toolkit for graphical user interfaces. Tk defines Tcl commands that let you create and manipulate user interface widgets. The script-based approach to user interface programming has three benefits:
Development is fast because of the rapid turnaround; there is no waiting for long compilations.
The Tcl commands provide a higher-level interface than most standard C library user-interface toolkits. Simple user interfaces require just a handful of commands to define them. At the same time, it is possible to refine the user interface in order to get every detail just so. The fast turnaround aids the refinement process.
The user interface can be factored out from the rest of your application. The developer can concentrate on the implementation of the application core and then fairly painlessly work up a user interface. The core set of Tk widgets is often sufficient for all your user interface needs. However, it is also possible to write custom Tk widgets in C, and again there are many contributed Tk widgets available on the network.
Java has exploded onto the computer scene since this book was first published. Java is a great systems programming language that in the long run could displace C and C++. This is fine for Tcl, which is designed to glue together building blocks written in any system programming language. Tcl was designed to work with C, but has been adapted to work with the Java Virtual Machine. Where I say "C or C++", you can now say "C, C++, or Java," but the details are a bit different with Java. This book does not describe the Tcl/Java interface, but you can find TclBlend on the CD-ROM. TclBlend loads the Java Virtual Machine into your Tcl application and lets you invoke Java methods. It also lets you implement Tcl commands in Java instead of C or C++.
Tcl and Tk Versions
Tcl and Tk continue to evolve. See beedub/book/ for updates and news about the latest Tcl releases. Tcl and Tk have had separate version numbers for historical reasons, but they are released in pairs that work together. The original edition of this book was based on Tcl 7.4 and Tk 4.0, and there were a few references to features in Tk 3.6. This third edition has been updated to reflect new features added through Tcl/Tk 8.2:
Tcl 7.5 and Tk 4.1 had their final release in May 1996. These releases feature the port of Tk to the Windows and Macintosh environments. The Safe-Tcl security mechanism was introduced to support safe execution of network applets. There is also network socket support and a new Input/Output (I/O) subsystem to support high-performance event-driven I/O.
Tcl 7.6 and Tk 4.2 had their final release in October 1996. These releases include improvements in Safe-Tcl, and improvements to the grid geometry manager introduced in Tk 4.1. Cross-platform support includes virtual events (e.g., < > as opposed to ), standard dialogs, and more file manipulation commands.
Tcl 7.7 and Tk 4.3 were internal releases used for the development of the Tcl/Tk plug-in for the Netscape Navigator and Microsoft Internet Explorer Web browsers. Their development actually proceeded in parallel to Tcl 7.6 and Tk 4.2. The plug-in has been released for a wide variety of platforms, including Solaris/SPARC, Solaris/INTEL, SunOS, Linux, Digital UNIX, IRIX, HP/UX, Windows 95, Windows NT, and the Macintosh. The browser plug-in supports Tcl applets in Web pages and uses the sophisticated security mechanism of Safe-Tcl to provide safety.
Tcl 8.0 features an on-the-fly compiler for Tcl that provides many-times faster Tcl scripts. Tcl 8.0 supports strings with embedded null characters. The compiler is transparent to Tcl scripts, but extension writers need to learn some new C APIs to take advantage of its potential. The release history of 8.0 spread out over a couple of years as John Ousterhout moved from Sun Microsystems to Scriptics Corporation. The widely used 8.0p2 release was made in the fall of 1997, but the final patch release, 8.0.5, was made in the spring of 1999.
Tk changed its version to match Tcl at 8.0. Tk 8.0 includes a new platform-independent font mechanism, native menus and menu bars, and more native widgets for better native look and feel on Windows and Macintosh.
Tcl/Tk 8.1 features full Unicode support, a new regular expression engine that provides all the features found in Perl 5, and thread safety so that you can embed Tcl into multithreaded applications. Tk does a heroic job of finding the correct font to display your Unicode characters, and it adds a message catalog facility so that you can write internationalized applications. The release history of Tcl/Tk 8.1 also straddled the Sun to Scriptics transition. The first alpha release was made in the fall of 1997, and the final patch release, 8.1.1, was made in May 1999.
Tcl/Tk 8.2 is primarily a bug fix and stabilization release. There are a few minor additions to the Tcl C library APIs to support more extensions without requiring core patches. Tcl/Tk 8.2 went rapidly into final release in the summer of 1999.
Who Should Read This Book
This book is meant to be useful to the beginner in Tcl as well as the expert. For the beginner and expert alike, I recommend careful study of Chapter 1, Tcl Fundamentals. The programming model of Tcl is designed to be simple, but it is different from many programming languages. The model is based on string substitutions, and it is important that you understand it properly to avoid trouble in complex cases. The remainder of the book consists of examples that demonstrate how to use Tcl and Tk productively. For your reference, each chapter has tables that summarize the Tcl commands and Tk widgets they describe.
This book assumes that you have some programming experience, although you should be able to get by even if you are a complete novice. Knowledge of UNIX shell programming will help, but it is not required. Where aspects of window systems are relevant, I provide some background information. Chapter 2 describes the details of using Tcl and Tk on UNIX, Windows, and Macintosh.
How to Read This Book
This book is best used in a hands-on manner, trying the examples at the computer. The book tries to fill the gap between the terse Tcl and Tk manual pages, which are complete but lack context and examples, and existing Tcl programs that may or may not be documented or well written.
I recommend the on-line manual pages for the Tcl and Tk commands. They provide a detailed reference guide to each command. This book summarizes much of the information from the manual pages, but it does not provide the complete details, which can vary from release to release. HTML versions of the on-line manual pages can be found on the CD-ROM that comes with this book.
Other Tcl Books
This book was the second Tcl book after the original book by John Ousterhout, the creator of Tcl. Since then, the number of Tcl books has increased remarkably. The following are just some of the books currently available.
Tcl and the Tk Toolkit (Addison-Wesley, 1994) by John Ousterhout provides a broad overview of all aspects of Tcl and Tk, even though it covers only Tcl 7.3 and Tk 3.6. The book provides a more detailed treatment of C programming for Tcl extensions.
Exploring Expect (O'Reilly & Associates, Inc., 1995) by Don Libes is a great book about an extremely useful Tcl extension. Expect lets you automate the use of interactive programs like ftp and telnet that expect to interact with a user. By combining expect and Tk, you can create graphical user interfaces for old applications that you cannot modify directly.
Graphical Applications with Tcl & Tk (M&T Press, 1996) by Eric Johnson is oriented toward Windows users. The second edition is up-to-date with Tcl/Tk 8.0.
Tcl/Tk Tools (O'Reilly & Associates, Inc., 1997) by Mark Harrison describes many useful Tcl extensions. These include Oracle and Sybase interfaces, object-oriented language enhancements, additional Tk widgets, and much more. The chapters were contributed by the authors of the extensions, so they provide authoritative information on some excellent additions to the Tcl toolbox.
CGI Developers Resource, Web Programming with Tcl and Perl (Prentice Hall, 1997) by John Ivler presents Tcl-based solutions to programming Web sites.
Effective Tcl/Tk Programming (Addison Wesley, 1997) by Michael McLennan and Mark Harrison illustrate Tcl and Tk with examples and application design guidelines.
Interactive Web Applications with ...
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Book Description Prentice Hall. Book Condition: New. Brand New. Bookseller Inventory # 0130385603
Book Description Prentice Hall, 2003. Paperback. Book Condition: New. book. Bookseller Inventory # 0130385603
Book Description Prentice Hall, 2003. Paperback. Book Condition: New. 4. Bookseller Inventory # DADAX0130385603
Book Description Prentice Hall, 2003. Book Condition: New. Brand New, Unread Copy in Perfect Condition. A+ Customer Service! Summary: List of Examples. List of Tables. Preface. I. Tcl BASICS. 1. Tcl Fundamentals. Tcl Commands. Hello, World! Variables. Command Substitution. Math Expressions. Backslash Substitution. Grouping with Braces and Double Quotes. Procedures. A Factorial Example. More about Variables. More about Math Expressions. Comments. Substitution and Grouping Summary. Fine Points. Reference. 2. Getting Started. The source Command. UNIX Tcl Scripts. Windows Start Menu. Macintosh OS 8/9 and ResEdit. The console Command. Command-Line Arguments. Predefined Variables. 3. The Guestbook CGI Application. A Quick Introduction to HTML. CGI for Dynamic Pages. The guestbook.cgi Script. Defining Forms and Processing Form Data. Handling Errors in CGI Scripts. Next Steps. 4. String Processing in Tcl. The string Command. The append Command. The format Command. The scan Command. The binary Command. Related Chapters. 5. Tcl Lists. Tcl Lists. Constructing Lists. Getting List Elements: llength, lindex, and lrange. Modifying Lists: linsert and lreplace. Searching Lists: lsearch. Sorting Lists: lsort. The split Command. The join Command. Related Chapters. 6. Control Structure Commands. If Then Else. Switch. While. Foreach. For. Break and Continue. Catch. Error. Return. 7. Procedures and Scope. The proc Command. Changing Command Names with rename. Scope. The global Command. Call by Name Using upvar. Variable Aliases with upvar. 8. Tcl Arrays. Array Syntax. The array Command. Building Data Structures with Arrays. 9. Working with Files and Programs. Running Programs with exec. The file Command. Cross-Platform File Naming. Manipulating Files and Directories. File Attributes. Input/Output Command Summary. Opening Files for I/O. Reading and Writing. The Current Directory cd and pwd. Matching File Names with glob. The exit and pid Commands. Environment Variables. The registry Command. II. ADVANCED Tcl. 10. Quoting Issues and Eval. Constructing Code with the list Command. Exploiting the concat inside eval. The uplevel Command. The subst Command. 11. Regular Expressions. When to Use Regular Expressions. Regular Expression Syntax. Advanced Regular Expressions. Syntax Summary. The regexp Command. The regsub Command. Transforming Data to Program with regsub. Other Commands That Use Regular Expressions. 12. Script Libraries and Packages. Locating Packages: The auto_path Variable. Using Packages. Summary of Package Loading. The package Command. Libraries Based on the tclIndex File. The unknown Command. Interactive Conveniences. Tcl Shell Library Environment. Coding Style. 13. Reflection and Debugging. The clock Command. The info Command. Cross-Platform Support. Tracing Variables and Commands. Interactive Command History. Debugging. Tcl Dev Kit. Other Tools. Performance Tuning. 14. Namespaces. Using Namespaces. Namespace Variables. Command Lookup. Nested Namespaces. Importing and Exporting Procedures. Callbacks and Namespaces. Introspection. The namespace Command. Converting Existing Packages to use Namespaces. [incr Tcl] Object System. xotcl Object System. Notes. 15. Internationalization. Character Sets and Encodings. Message Catalogs. 16. Event-Driven Programming. The Tcl Event Loop. The after Command. The fileevent Command. The vwait Command. The fconfigure Command. 17. Socket Programming. Networking Extensions for Tcl. Client Sockets. Server Sockets. The Echo Service. Fetching a URL with HTTP. The http Package. Basic Authentication. 18. TclHttpd Web Server. Int. Bookseller Inventory # ABE_book_new_0130385603
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