How To Capture Runtime Error In Vbscript
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Vbscript On Error Goto
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Vbscript On Error Exit
each other. Join them; it only takes a minute: Sign up capture any error in VBScript? up vote 3 down vote favorite 4 I have a batch file that calls a VBScript (.vbs) program. After calling it, my batch vbscript error handling best practices script checks errorlevel to see if the .vbs program failed. I can signal failure with an exit code in the .vbs program with WScript.Quit(1). However, I can only do that explicitly. If some unexpected run-time error happens, the .vbs quits with an error dialog box, however the exit code is zero so my batch file thinks it suceeded! How can I change that behavior? And if you are thinking of saying, use on error goto, don't bother... vbscript error handling line number that syntax is available in regular VB, but not in VBScript. windows vbscript batch-file share|improve this question asked May 28 '10 at 14:08 JoelFan 15.7k2494170 add a comment| 5 Answers 5 active oldest votes up vote 3 down vote accepted I thought of an out-of-the-box solution... Who says 0 has to mean success? VBScript sometimes returns a 0 return code for failures, so why not embrace that? Adopt 0 as (at least one possible) failure code and make up another number (e.g. 10) as the "success code". At the end of the script, put WScript.Quit(10). That will only be hit if everything succeeded up to that point. Then instead of "if errorlevel 1" in the calling batch file, use "if %errorlevel% == 10" share|improve this answer answered May 30 '10 at 17:24 JoelFan 15.7k2494170 1 "Who says 0 has to mean success?"... this is a standard convention, and many tools that launch other processes will assume it. See wikipedia's Exit status semantics for more detail. That said, VBscript is sufficiently broken in this regard that it is quite appealing to flout convention given the limited alternatives, if you know what will call your script and that it's OK with that. Alternatively you could wrap your script in something that, say, subtracts 1 from your exit code. As long as you didn't write said wrapper in vbscript ;^] &nd
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
On Error Resume Next Vbscript W3schools
I. The Basics 1. Introduction 2. Program Structure 3. Data Types and Variables 4. Error Handling and vbscript goto Debugging 5. VBScript with Active Server Pages 6. Programming Outlook Forms 7. Windows Script Host 8. VBScript with Internet Explorer II. Reference 9. The Language
If Err.number 0 Then
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 though http://stackoverflow.com/questions/2929715/capture-any-error-in-vbscript 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 VBScript https://www.safaribooksonline.com/library/view/vbscript-in-a/1565927206/ch04s02.html 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 A that
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 for the next few days. Today, I want to very https://blogs.msdn.microsoft.com/ericlippert/2004/08/19/error-handling-in-vbscript-part-one/ carefully describe what the error handling semantics are in the language, because there is some https://msdn.microsoft.com/en-us/library/xe43cc8d(v=vs.84).aspx confusion over how exactly it works. There 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 execution on the next statement. But as we'll see, there are some subtleties. But before that, what the heck is on error 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 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 vbscript on error 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 to have consistent error handling in a world where that setting is global, and you'll see why it's per-procedure.) In this case, Blah2 gets an error. Blah2 is not in ‘resume next' mode, so it aborts itself, records that there was an error situation, and returns to its caller. The caller sees the error, but the caller is in ‘resume
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. VBScript VBScript Language Reference Errors (VBScript) Errors (VBScript) VBScript Run-time Errors VBScript Run-time Errors VBScript Run-time Errors VBScript Run-time Errors VBScript Syntax Errors TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. VBScript Run-time Errors VBScript run-time errors are errors that result when your VBScript script attempts to perform an action that the system cannot execute. VBScript run-time errors occur while your script is being executed; when variable expressions are being evaluated, and memory is being dynamic allocated.ErrorsError NumberDescription429ActiveX component can't create object507An exception occurred449Argument not optional17Can't perform requested operation430Class doesn't support Automation506Class not defined11Division by zero48Error in loading DLL5020Expected ')' in regular expression5019Expected ']' in regular expression432File name or class name not found during Automation operation92For loop not initialized5008Illegal assignment51Internal error505Invalid or unqualified reference481Invalid picture5Invalid procedure call or argument5021Invalid range in character set94Invalid use of Null448Named argument not found447Object doesn't support current locale setting445Object doesn't support this action438Object doesn't support this property or method451Object not a collection504Object not safe for creating503Object not safe for initializing502Obj