Book Image

Tcl/Tk 8.5 Programming Cookbook

Book Image

Tcl/Tk 8.5 Programming Cookbook

Overview of this book

With Tcl/Tk, you can create full-featured cross-platform applications in a simple and easy-to-understand way without any expensive development package; the only tools required are a simple text editor and your imagination. This practical cookbook will help you to efficiently interact with editors, debuggers, and shell type interactive programs using Tcl/Tk 8. This cookbook will comprehensively guide you through practical implementation of Tcl/Tk 8.5 commands and tools. This book will take you through all the steps needed to become a productive programmer in Tcl/Tk 8. Right from guiding you through the basics to creating a stand-alone application, it provides complete explanation of all the steps along with handy tips and tricks. The book begins with an introduction to the Tcl shell, syntax, variables, and programming best practices in the language. It then explores procedures and the flow of events with control constructs followed by advanced error trapping and recovery. From Chapter 4, a detailed study of string expressions and handling enables you to handle various string functions and use lists to expand the string functionality. The book then discusses in-depth the Tcl Dictionary and how to utilize it to store and retrieve data. File operations and Tk GUI handling are covered extensively along with a developing a real-world address book application to practice the concepts learned.
Table of Contents (20 chapters)
Tcl/Tk 8.5 Programming Cookbook
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Preface

Adding a record


Now that we have an interface it would be nice to have records. To accomplish this, we need to give the user the ability to add a record including a photo if desired. This will require that we set up our variables to support adding a record, clear the interface, associate a picture to the entry and then save the record when the user is complete as well as a procedure to load the record for display.

How to do it…

In the address book file, enter the following text at the location defined in our main page for procedures as defined within the comments:

proc addRecord {} {
global currentRecord
global recordCount
global addressInfo
global pictureFile
# Clear current entries
clearRecord
set pictureFile ""
set currentRecord [expr $recordCount +1]
}
# Clear any contents from the entry widgets
proc clearRecord {} {
.main.efirst delete 0 end
.main.elast delete 0 end
.main.eaddress delete 0 end
.main.ecity delete 0 end
.main.estate delete 0 end
.main.ezip delete 0 end
.main.ephone delete...