VBScript Programmer’s Reference,
`Second Edition
`
`Adrian Kingsley-Hughes
`Kathie Kingsley-Hughes
`Daniel Read
`
`WILEY
`
`Wiley Publishing, Inc.
`
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`VBScript Programmer's Reference, Second Edition
`Published by
`Wiley Publishing,Inc.
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`Indianapolis, IN 46256
`www.wiley.com
`Copyright © 2004 by John Wiley & Sons. All rights reserved.
`Published simultaneously in Canada
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`
`Library of Congress Card Number:
`eISBN:0-7645-7880-4
`Printed in the United States of America
`109 8 7 654321
`
`Library ofCongress Cataloging-in-Publication Data
`Kingsley-Hughes, Adrian.
`VBScript programmer’s reference / Adrian Kingsley-Hughes, Kathie
`Kingsley-Hughes, Daniel Read.—2nd ed.
`.
`cm.
`Includes index.
`eISBN 0-7645-7880- 4
`2. HTML (Document markuplanguage).
`1. VBScript (Computer program language).
`
`1. Kingsley-Hughes, Kathie.3. World Wide Web. II. Read, Daniel, 1969-_III.Title
`
`QA76.73.V27K56
`2004
`005.2'762—de22
`2004007671
`
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`Chapter 6
`
`off, a small yellow triangle with an exclamation point (!) will appearin the status bar at the bottom of the
`browser window.
`
`This will be the user’s only indication that an error has occurred, and the actual error message will only
`comeupif the user happensto notice the yellow icon and clicks on it. However,it is important to
`considerthe likely possibility that users of your Web pagewill not care whattheerroris. There is nothing
`that they can doaboutit anyway. All they knowisthat the page is not working. This situation underlines
`the importance of thoroughlytesting all of your browser-based VBScript code.
`
`Handling Errors
`Whatexactly does “error handling” mean? In the purest definition, error handling meanstake anactive,
`rather than passive, approach to respondingto errors. This means having extra code built into your script
`to deal with errors in case they occur. This can take the form of a “global” error handling schemethat
`does something such as:
`
`QO
`Q
`Q
`Q
`QQ
`
`displaying theerror to a user
`loggingthe errortoa file, database, or the Windows Event Log
`e-mailing the error to a system administrator
`paging the system administrator
`some combinationofall of the these
`
`In addition to a general error handling scheme, you can trap for specific errors at specific points. For
`example, trying to connectto a database is a common point where errors occur. The password entered by
`the user might be wrong, or the database might have reached the maximum allowable connections.
`Knowing that connecting to a database is error prone, the experienced VBScript programmerwill put a
`specific error trap in his or her codein the place where the code attempts a database connection.
`
`The remainderof this section will introduce the elements necessary for handling errors in your VBScript
`programs.
`
`The Err Object
`The Err objectis whatis described in the Microsoft VBScript documentation as an “intrinsic object with
`global scope,” which meansthatit is always available to any VBScript code. There is no need to declare a
`variable to hold an Err object and no needto instantiate it using CreateObject or New. Thereis exactly
`one Err object in memory atall times while a VBScript program is running.
`
`The Err object contains information aboutthe last error that occurred.If no error has occurred, the Err
`object will still be available, but it will not contain any error information. Error informationis stored in
`the properties of the Err object; some of which are given in the table.
`
`The properties and methodsof the Err object are described in more detail in Appendix E.
`
`The Err object also has two methods. Thefirst is the Clear method, whicherasesall of the properties of
`the Err object so that the information aboutthelast error is thrown away. The secondis the Raise
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