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Published by O'Reilly Media, Inc. VBScript in a Nutshell Preface Why This Book? Who Should Read This Book? How This Book Should Be Used How This Book Is Structured Conventions in This Book How To Contact Us I. The

Vbscript Type Mismatch Error

Basics 1. Introduction 2. Program Structure 3. Data Types and Variables 4. Error Handling and vbscript type mismatch 800a000d Debugging 5. VBScript with Active Server Pages 6. Programming Outlook Forms 7. Windows Script Host 8. VBScript with Internet Explorer II. Reference 9.

Vbscript Type Mismatch String

The Language Reference III. Appendixes A. Language Elements by Category B. VBScript Constants C. Operators Index Colophon Chapter 4. Error Handling and DebuggingErrors, bugs, and therefore debugging are a part of life for a programmer. As the saying goes, if https://support.microsoft.com/en-us/kb/976949 you haven’t made any mistakes, then you aren’t trying hard enough.Dealing with errors actually involves two very different processes: error handling and debugging. Error handling is a combination of coding and methodology that allows your program to anticipate user and other errors. It allows you to create a robust program. Error handling does not involve weeding out bugs and glitches in your source code, although some of the error handling techniques covered in this chapter can be https://www.safaribooksonline.com/library/view/vbscript-in-a/1565927206/ch04.html used to great advantage at the debugging stage. In general, error handling should be part of your overall program plan, so that when you have an error-free script, nothing is going to bring it to a screeching halt. With some sturdy error handling in place, your program should be able to keep running despite all the misuse that your users can—and certainly will—throw at it.The following ASP page illustrates some simple error handling: Error Checking The error handling in this example is the best kind—it stops an error before it can occur. Suppose you hadn’t used the conditional If...Else statement and had allowed any value to be assigned to x. Sooner or later, some user will fail to enter a value or will enter a zero. Possibly in both cases, and certainly in the latter case, this would generate the “cannot divide by zero” runtime error. So error handling, as this code fragment illustrates, is as much about careful data validation as it is about handling actual errors.While preventing an error before it can occur is one approach to handling errors, the second is to handle the error af

a tutorial example on how to enable the script debugging option in IE 6.0 to watch the runtime error message raised from http://www.herongyang.com/vb_script/Error-Handling-Enable-Scritp-Debugging-in-IE.html a VBScript example code. Since we have been using Internet Explorer http://www.vistax64.com/vb-script/174440-script-language-vbscript.html (IE) as the host environment in previous sections, let's look at what will IE do when the VBScript raises a runtime error. IE 6.0 supports an option called "Disable Script Debugging (Internet Explorer)" on the "Advanced" tab. Let's uncheck it, meaning enable script debugging as type mismatch shown in the picture below: Now run the following VBScript example:
You should get a dialog box with this message: A Runtime Error has occurred. Do you wish to Debug? Line: 8 Error: Division by zero You can click the "No" button to close the dialog box. What happened in the example: When IE tries to execute the "x = 1/0" statement, a runtime error "Division by zero" is raised. IE stops executing the rest of the VBScript code, because the error handling flag is turned off by default. IE displays a dialog box asking your confirmation to start the debugging tool. "Err" object properties are printed on the dialog box, telling us the type of error, and where it occurs. Table of Contents  About This Book  Introduction of VBScript - Visual Basic Scripting Edition  Variant Data Type, Subtypes, and Literals  Arithmetic Operations  Numeric Comparison Operations and Logical Operations  String Operations - Concatenation and Comparison  Variable Declaration and Assignment Statement  Expression and Order of Operation Precedence

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