Error Handling In Vb Script
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LippertAugust 19, 200419 0 0 0 OK, enough about the Peloponnesian war -- a number of readers have asked me questions about error handling in VBScript recently, so I think I'll talk about it a bit
Vbscript On Error Continue
for the next few days. Today, I want to very carefully describe what vbs on error goto the error handling semantics are in the language, because there is some confusion over how exactly it works. There
If Err.number 0 Then
are two statements that affect error handling in VBScript: On Error Resume NextOn Error Goto 0 The meaning of the first seems clear -- if you get an error, ignore it and resume https://technet.microsoft.com/en-us/library/ee692852.aspx execution on the next statement. But as we'll see, there are some subtleties. But before that, what the heck is up with the second statement? The second statement turns off ‘resume next' mode if it is on. Yes, the syntax is ridiculous -- something like On Error Raise would be a whole lot more clear. But for historical purposes, this is what we're stuck with. Visual https://blogs.msdn.microsoft.com/ericlippert/2004/08/19/error-handling-in-vbscript-part-one/ Basic has an error handling mode which VBScript does not -- VB can branch to a labeled or numbered statement. (Remember line numbers? Those were the days!) To tell VB that you no longer wish to branch to that statement, you give zero, an invalid line number. C'est super-beaucoup-de-fromage, n'est-ce pas? But we're stuck with it now. The subtlety in the "resume next" mode is best illustrated with an example. Const InvalidCall = 5Print "Global code start"Blah1Print "Global code end"Sub Blah1() On Error Resume Next Print "Blah1 Start" Blah2 Print "Blah1 End"End SubSub Blah2() Print "Blah2 Start" Err.Raise InvalidCall Print "Blah2 End"End Sub This prints out Global code startBlah1 StartBlah2 StartBlah1 EndGlobal code end Hold on a minute -- when the error happened, Blah1 had already turned ‘resume next' mode on. The next statement after the error raise is Print "Blah2 End" but that statement never got executed. What's going on? What's going on is that the error mode is on a per-procedure basis, not a global basis. (If it were on a global basis, all kinds of bad things could happen -- think about how you'd have to design a program t
VBScript in a Nutshell by Matt Childs... 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 https://www.safaribooksonline.com/library/view/vbscript-in-a/1565927206/ch04s02.html I. The Basics 1. Introduction 2. Program Structure 3. Data Types and Variables 4. Error Handling and Debugging 5. VBScript with Active Server Pages 6. Programming Outlook Forms 7. Windows Script Host 8. VBScript with Internet Explorer II. Reference 9. The https://www.tutorialspoint.com/vbscript/vbscript_error_handling.htm Language Reference III. Appendixes A. Language Elements by Category B. VBScript Constants C. Operators Index Colophon Error Handling Error handling does not involve finding errors in your scripts. Instead, use error handling techniques to allow your program to continue executing even error handling though a potentially fatal error has occurred. Ordinarily, all runtime errors that are generated by the VBScript engine are fatal, since execution of the current script is halted when the error occurs. Error handling allows you to inform the user of the problem and either halt execution of the program or, if it is prudent, continue executing the program.The On Error Resume Next StatementThere are two main elements to error handling in VBScript. The first is the On Error statement, which informs the error handling in VBScript engine of your intention to handle errors yourself, rather than to allow the VBScript engine to display a typically uninformative error message and halt the program. This is done by inserting a statement like the following at the start of a procedure:On Error Resume NextThis tells the VBScript engine that, should an error occur, you want it to continue executing the program starting with the line of code which directly follows the line in which the error occurred. For example, in the simple WSH script:On Error Resume Next x = 10 y = 0 z = x / y Alert za “Cannot divide by Zero” error is generated on the fourth line of code because the value of y is 0. But because you’ve placed the On Error statement in line 1, program execution continues with line 5. The problem with this is that when an error is generated, the user is unaware of it; the only indication that an error has occurred is the blank Alert box (from line 5) that’s displayed for the user.TipA particular On Error statement is valid until another On Error statement in the line of execution is encountered. This means that if Function A contains an On Error statement, and Function A calls Function B, but Function B does not contain an On Error statement, the error handling from Function A is still valid. Therefore, if an error occurs in Function B, it is the On Error statement in Function
Enabling VBScript - Placement VBScript - Variables VBScript - Constants VBScript - Operators VBScript - Decisions VBScript - Loops VBScript - Events VBScript - Cookies VBScript - Numbers VBScript - Strings VBScript - Arrays VBScript - Date VBScript Advanced VBScript - Procedures VBScript - Dialog Boxes VBScript - Object Oriented VBScript - Reg Expressions VBScript - Error Handling VBScript - Misc Statements VBScript Useful Resources VBScript - Questions and Answers VBScript - Quick Guide VBScript - Useful Resources VBScript - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who VBScript - Error Handling Advertisements Previous Page Next Page There are three types of errors in programming: (a) Syntax Errors and (b) Runtime Errors (c) Logical Errors. Syntax errors Syntax errors, also called parsing errors, occur at interpretation time for VBScript. For example, the following line causes a syntax error because it is missing a closing parenthesis: Runtime errors Runtime errors, also called exceptions, occur during execution, after interpretation. For example, the following line causes a runtime error because here syntax is correct but at runtime it is trying to call fnmultiply, which is a non-existing function: Logical errors Logic errors can be the most difficult type of errors to track down. These errors are not the result of a syntax or runtime error. Instead, they occur when you make a mistake in the logic that drives your script and you do not get the result you expected. You can n