On Error Goto Errorhandler
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three flavors: compiler errors such as undeclared variables that prevent your code from compiling; user data entry error such as a user entering a negative value where only a positive number is acceptable; and run time errors, that occur when VBA cannot on error goto line correctly execute a program statement. We will concern ourselves here only with run time errors.
Vba On Error Goto 0
Typical run time errors include attempting to access a non-existent worksheet or workbook, or attempting to divide by zero. The example code in this on error goto vbscript article will use the division by zero error (Error 11) when we want to deliberately raise an error. Your application should make as many checks as possible during initialization to ensure that run time errors do not occur vba on error exit sub later. In Excel, this includes ensuring that required workbooks and worksheets are present and that required names are defined. The more checking you do before the real work of your application begins, the more stable your application will be. It is far better to detect potential error situations when your application starts up before data is change than to wait until later to encounter an error situation. If you have no error handling code and a run time
Vba Error Handling Best Practices
error occurs, VBA will display its standard run time error dialog box. While this may be acceptable, even desirable, in a development environment, it is not acceptable to the end user in a production environment. The goal of well designed error handling code is to anticipate potential errors, and correct them at run time or to terminate code execution in a controlled, graceful method. Your goal should be to prevent unhandled errors from arising. A note on terminology: Throughout this article, the term procedure should be taken to mean a Sub, Function, or Property procedure, and the term exit statement should be taken to mean Exit Sub, Exit Function, or Exit Property. The term end statement should be taken to mean End Sub , End Function, End Property, or just End. The On Error Statement The heart of error handling in VBA is the On Error statement. This statement instructs VBA what to do when an run time error is encountered. The On Error statement takes three forms. On Error Goto 0 On Error Resume Next On Error Goto
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On Error Resume Next Vbscript
Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up VBA - On Error GoTo ErrHandler: up vote 1 down vote http://www.cpearson.com/excel/errorhandling.htm favorite I have a simple question about error-handling in VBA. I know how to use the On Error GoTo ErrHandler statement but instead using my own code at the specified label, I would rather use a prefabricated VBA-message. Something like this in C#: catch(Exception ex){ Console.Writeline(ex.Message); } vba error-handling share|improve this question edited Oct 29 '14 at 13:43 RubberDuck 5,70822458 asked May 15 '14 at 20:26 user3283415 3615 add http://stackoverflow.com/questions/23687970/vba-on-error-goto-errhandler a comment| 2 Answers 2 active oldest votes up vote 0 down vote accepted In your error handler code your can access the Err.Number and Err.Description. The Description in the error message you would have seen without error handling, so is the equivalent of ex.Message in your code sample. share|improve this answer answered May 15 '14 at 20:30 Andy G 13.4k52448 add a comment| up vote 3 down vote Create an ErrorHandler Module and place this sub in it. Public Sub messageBox(moduleName As String, procName As String, Optional style As VbMsgBoxStyle = vbCritical) MsgBox "Module: " & moduleName & vbCrLf & _ "Procedure: " & procName & vbCrLf & _ Err.Description, _ style, _ "Runtime Error: " & Err.number End Sub Call it from anywhere in your project like so. Private sub Foo() On Error GoTo ErrHandler 'do stuff ExitSub: ' clean up before exiting Exit Sub ErrHandler: ErrorHandler.messageBox "ThisModuleName","Foo" Resume ExitSub End Sub I use a module scoped constant to hold the module name. Modify to suit your needs. share|improve this answer answered May 15 '14 at 20:35 RubberDuck 5,70822458 This is a good idea... Thank you! –user3283415 May 15 '14 at 20:44 1 You're welcome. Error handling in vba i
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company http://stackoverflow.com/questions/6489941/error-in-on-error-statement Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs http://stackoverflow.com/questions/6028288/properly-handling-errors-in-vba-excel Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error in On Error statement up vote 2 down vote favorite I am totally not a VBScript developer. But as it usually on error happens I have to write a small script to check something. It opens Excel, writes something to it and closes it. But that's not the point. The point is that I cannot manage to write code for error handling. This script: Sub Work() On Error GoTo ErrMyErrorHandler Dim objExcelApp Dim wb Dim ws Set objExcelApp = CreateObject("Excel.Application") Set wb = objExcelApp.Workbooks.Add(True) Set ws = wb.Sheets(1) ws.Cells(1,1).Value = "Hello" ws.Cells(1,2).Value = "World" wb.SaveAs("c:\test.xls") objExcelApp.Quit() Exit Sub on error goto ErrMyErrorHandler: MsgBox Err.Description, vbExclamation + vbOKCancel, "Error: " & CStr(Err.Number) End Sub Work() gives this error: Line 2 is the line with the On Error statement. What am I doing wrong? Thank you. vbscript share|improve this question asked Jun 27 '11 at 7:45 Grigory 45911024 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted looks like you can not point custom label to error handler in VB Script. You can only use on error goto 0 '(raises exceptions) on error resume next '(ignores exceptions) if you use the second syntax, you can catch occruing exceptions via Err global variable: if Err.Number <> 0 then MsgBox "Exception occured: " & Err.Decscription share|improve this answer edited Jun 27 '11 at 8:43 answered Jun 27 '11 at 7:48 heximal 7,46822149 add a comment| up vote 3 down vote Heximal is correct that VBScript does not allow custom labels for error handlers. Using your example, you'd really be trying to do something like this. Sub Work On Error Resume Next Dim objExcelApp Dim wb Dim ws Set objExcelApp = CreateObject("Excel.Application") Set wb = objExcelApp.Workbooks.Add(True) Set ws = wb.Sheets(1) ws.Cells(1,1).Value = "Hello" ws.Cells(1,2).Value = "World" wb.SaveAs("c:\test.xls") objExcelApp.Quit() If Err.Number <> 0 Then ErrMyErrorHandler End Sub Sub ErrMyErrorHandler MsgBox Err.Description, vbExclamation + vbOKCancel, "Error: " & CStr(Err.Number) End Sub Work() B
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Properly Handling Errors in VBA (Excel) up vote 34 down vote favorite 19 I've been working with VBA for quite a while now, but I'm still not so sure about Error Handling. A good article is the one of CPearson.com However I'm still wondering if the way I used to do ErrorHandling was/is completely wrong: Block 1 On Error Goto ErrCatcher If UBound(.sortedDates) > 0 Then // Code Else ErrCatcher: // Code End If The if clause, because if it is true, it will be executed and if it fails the Goto will go into the Else-part, since the Ubound of an Array should never be zero or less, without an Error, this method worked quite well so far. If I understood it right it should be like this: Block 2 On Error Goto ErrCatcher If Ubound(.sortedDates) > 0 Then // Code End If Goto hereX ErrCatcher: //Code Resume / Resume Next / Resume hereX hereX: Or even like this: Block 3 On Error Goto ErrCatcher If Ubound(.sortedDates) > 0 Then // Code End If ErrCatcher: If Err.Number <> 0 then //Code End If The most common way I see is that one, that the Error "Catcher" is at the end of a sub and the Sub actually ends before with a "Exit Sub", but however isn't it a little confusing if the Sub is quite big if you jump vice versa to read through the code? Block 4 Source of the following Code: CPearson.com On Error Goto ErrHandler: N = 1 / 0 ' cause an error ' ' more code