S60 Programming A Tutorial Guide

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5 S60 Programming A Tutorial Guide Paul Coulton, Reuben Edwards With Helen Clemson Reviewed by Alex Wilbur, Alastair Milne, Filippo Finelli, Graeme Duncan, Iain Campbell, Kal Patel, Matthew O Donnell, Phil Northam, Phil Spencer, Richard Harrison, Ricky Junday, Stuart Fisher, Tom Janssens, Twm Davies Head of Symbian Press Freddie Gjertsen Managing Editor Satu McNabb

6 Copyright 2007 John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England Telephone (+44) (for orders and customer service enquiries): Visit our Home Page on or All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except under the terms of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London W1T 4LP, UK, without the permission in writing of the Publisher. Requests to the Publisher should be addressed to the Permissions Department, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England, or ed to permreq@wiley.co.uk, or faxed to (+44) Designations used by companies to distinguish their products are often claimed as trademarks. All brand names and product names used in this book are trade names, service marks, trademarks or registered trademarks of their respective owners. The Publisher is not associated with any product or vendor mentioned in this book. This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold on the understanding that the Publisher is not engaged in rendering professional services. If professional advice or other expert assistance is required, the services of a competent professional should be sought. Other Wiley Editorial Offices John Wiley & Sons Inc., 111 River Street, Hoboken, NJ 07030, USA Jossey-Bass, 989 Market Street, San Francisco, CA , USA Wiley-VCH Verlag GmbH, Boschstr. 12, D Weinheim, Germany John Wiley & Sons Australia Ltd, 42 McDougall Street, Milton, Queensland 4064, Australia John Wiley & Sons (Asia) Pte Ltd, 2 Clementi Loop #02-01, Jin Xing Distripark, Singapore John Wiley & Sons Canada Ltd, 6045 Freemont Blvd, Mississauga, Ontario, L5R 4J3, Canada Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books. Library of Congress Cataloging-in-Publication Data Coulton, Paul. S60 programming : a tutorial guide / Paul Coulton, Reuben Edwards, with Helen Clemson. p. cm. Includes bibliographical references and index. ISBN (pbk. : alk. paper) 1. Computer software Development. 2. Wireless communication systems Programming. 3. Mobile communication systems. 4. Symbian OS (Computer file) I. Edwards, Reuben. II. Clemson, Helen. III. Title. QA76.76.D47C dc British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library ISBN Typeset in 10/12pt Optima by Laserwords Private Limited, Chennai, India Printed and bound in Great Britain by TJ International, Padstow, Cornwall This book is printed on acid-free paper responsibly manufactured from sustainable forestry in which at least two trees are planted for each one used for paper production.

7 Contents About this Book About the Authors Acknowledgements Symbian Press Acknowledgements Glossary of Terms ix xi xiii xv xvii 1 Introduction to Mobile-Phone Systems Wireless Technologies Cellular Systems Elements of a Mobile-Phone System Keeping Users Calls Separate Multipath Propagation G Mobile-Phone Systems GPRS Systems G Mobile-Phone Systems IP Multimedia Subsystem Mobile-Phone Hardware 17

8 vi CONTENTS 2 Introduction to Symbian OS 19 Introduction The Development of Symbian OS Symbian OS User Interfaces Coding Idioms Tool Chains 28 3 The Console Application 33 Introduction Creating a Console Application CBase Classes Protecting Memory Putting It Into Practice: An Engine for a Simple Card Game 46 Summary 56 4 A GUI Application 57 Introduction The Structure of a Symbian OS Application Descriptors Literals Simple Graphics Bitmap Images Observer Mixin Classes Handling User Input Putting It Into Practice: Creating a GUI-based Card Game 96 5 Storing Data 103 Introduction Resource File Header Menus CBA Buttons Changing the Application Title Dialogs Forms Files, Streams and Stores Putting It Into Practice: Saving Your Name and High Score 143

9 CONTENTS vii 6 Complex Interfaces 153 Introduction Multiple View Applications Dynamic Menus Advanced Graphics Putting It Into Practice: The Blackjack Game Getting Your Application Onto a Phone Communications 187 Introduction Active Objects Serial Communications Text Messaging Socket Communications Infrared Communications Bluetooth Communications Putting It Into Practice: A Bluetooth Messaging Application Routes to Market 231 Introduction Testing an Application Quality Assurance Symbian Signed Software Marketing Portals Digital Rights Management 247 Appendix A Web Resources 251 Appendix B Specifications of Phones Based on S60 for Symbian OS 253 Index 289

11 About this Book S60 is the world s leading, feature-rich, smartphone software and it is based on Symbian OS, the market-leading operating system for smartphones. S60 includes an easy-to-use and intuitive award-winning user interface. With over 100 million mobile phones using Symbian OS, this book will give you the potential to develop applications on a global scale. Created for the academic and professional programmer and based around a series of exercises, this book has a unique approach to developing for Symbian OS. As well as being essential for students learning about Symbian OS, this book is also an invaluable aid to academic and professional programmers who want to learn about Symbian and quickly attain a level of competence allowing them to develop their own applications for the commercial market. This book focuses on developing an application using Symbian C++ and is fully up to date for the latest version of the operating system (Symbian OS v9), with sample code that runs on Symbian OS v9 smartphones and advice on the impact of platform security on application development. S60 Programming: A tutorial guide aims to help readers to develop commercial quality applications and to provide a route to market. It does so in a fun and innovative way.

12 x ABOUT THIS BOOK Why this Book? Who is it For? S60 Programming: A tutorial guide is based on our experiences in developing and teaching an academic course on Symbian software development. The book is based around a series of exercises for a Symbian Game Design module that forms part of the MSc in Mobile Game Design and M-Commerce Systems. When designing the exercises, we were very conscious of the steep learning curve experienced by many programmers (including ourselves) when getting started with Symbian, and that the majority of text books, although useful for programmers with some knowledge of Symbian, provided a set of unrelated and often incomplete examples, rather than taking programmers through a process of creating an increasingly complex application. This book develops a programmer s understanding by providing a series of examples based on the same application. It leads a programmer through the rigors of developing Symbian applications capable of being launched in the commercial market. The exercises take the reader from the initial development of a console game engine to a two-player blackjack game based on a graphical user interface (GUI) operating over a Bluetooth connection between two mobile phones. Another aspect that we feel is worthy of inclusion in this book is an introduction to the operation and environment of mobile-phone systems and the devices which operate in that environment. We believe that understanding these systems, and particularly that the mobile environment is much less predictable than a wired system, aids the application development process. Successful applications will be those that cope with all eventualities. Programming mobile-phone applications also requires an understanding of the resource constraints of mobile phones which, again, affects the development process. This book comes from our experience in developing and teaching an academic course. However, we believe it will prove an invaluable aid to academic and professional programmers alike. Indeed, developing commercial quality applications and providing a route to market is one of the underlying aims of the course from which the majority of this work is taken. The only assumption this book makes is that you have experience in C++ (an essential for all budding Symbian developers) and that you are keen to get started developing applications for Symbian smartphones.

13 About the Authors Paul Coulton and Reuben Edwards are internationally renowned researchers and developers of innovative mobile-phone systems and applications. Their work has been recognized within both academia and industry. Paul was selected by Nokia as one of the top 50 developers of mobile-phone applications in the world, chosen from a community of two million to become an inaugural Forum Nokia Champion. Pioneering academics for Symbian education, Paul and Reuben are part of the Nokia Symbian Educators Group. They run the only MSc in Mobile Games Design and M-Commerce Systems in the world and have formed a company that specializes in Mobile Applications Development. Helen Clemson is a mobile-phone programmer, now working with Mobica, who has extensive experience of Symbian OS, both in research and development. Helen has contributed to many of the most innovative projects developed by Reuben and Paul and provides practical training for the Mobile Games Design and M-Commerce Systems MSc.

15 Acknowledgements The authors wish to express their sincere thanks to those friends and colleagues at Lancaster University, Symbian, Nokia and Wiley for their invaluable contribution in bringing this project to fruition.

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