On Error Resume Err.clear
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 Samples Retired content We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Reference (Visual Basic) Visual Basic Reference Objects Objects Err Object Err Object Err Object Collection Object Err Object Err Object Members Clear Method Description Property Erl Property HelpContext Property HelpFile Property LastDllError Property Number Property Raise Method Source Property My.Application Object My.Application.Info Object My.Application.Log Object My.Computer Object My.Computer.Audio Object My.Computer.Clipboard Object My.Computer.Clock Object My.Computer.FileSystem Object My.Computer.FileSystem.SpecialDirectories Object My.Computer.Info Object My.Computer.Keyboard Object My.Computer.Mouse Object My.Computer.Network Object My.Computer.Ports Object My.Computer.Registry Object My.Forms Object My.Log Object My.Request Object My.Response Object My.Resources Object My.Settings Object My.User Object My.WebServices Object TextFieldParser Object 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. This documentation is archived and is not being maintained. Err Object (Visual Basic) Visual Studio 2008 Other Versions Visual Studio 2005 Visual Studio .NET 2003 Contains information about run-time errors.RemarksThe properties of the Err object are set by the generator of an error—Visual Basic, an object, or the programmer.When a run-time error occurs, the properties of the Err obje
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 https://msdn.microsoft.com/en-us/library/ka13cy19(v=vs.90).aspx each other. Join them; it only takes a minute: Sign up When is it appropriate to explicitly use Err.Clear? up vote 2 down vote favorite For example, the following function is used for checking whether a workbook is open: Function BookOpen(Bk As String) As Boolean Dim T As Excel.Workbook Err.Clear On Error Resume Next Set T = http://stackoverflow.com/questions/19477375/when-is-it-appropriate-to-explicitly-use-err-clear Application.Workbooks(Bk) BookOpen = Not T Is Nothing Err.Clear On Error GoTo 0 End Function Are these two Err.Clear statements necessary? vba excel-vba share|improve this question edited Sep 29 '15 at 8:29 Tomalak 208k41346464 asked Oct 20 '13 at 12:35 Felix 6015 add a comment| 1 Answer 1 active oldest votes up vote 6 down vote accepted In this example Function BookOpen(Bk As String) As Boolean Dim T As Excel.Workbook Err.Clear On Error Resume Next Set T = Application.Workbooks(Bk) BookOpen = Not T Is Nothing Err.Clear On Error GoTo 0 End Function none of the uses is appropriate, because On Error resets the last error, so Err.Clear is redundant. It's appropriate after actually handling a failed statement. Function BookOpen(Bk As String) As Boolean Dim T As Excel.Workbook On Error Resume Next Set T = Application.Workbooks(Bk) ' this can fail... ' so handle a possible failure If Err.Number <> 0 Then MsgBox "The workbook named """ & Bk & """ does not exist." Err.Clear End If BookOpen = Not T Is Nothing
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 https://www.safaribooksonline.com/library/view/vbscript-in-a/1565927206/re45.html This Book How To Contact Us I. The Basics 1. Introduction 2. Program Structure http://www.excel-easy.com/vba/examples/err-object.html 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 Language Reference III. Appendixes A. Language Elements by Category B. VBScript Constants C. Operators Index Colophon Name Err.Clear MethodSyntaxErr.ClearDescriptionExplicitly resets all the on error properties of the Err object after an error has been handled.Rules at a GlanceYou need to clear the Err object only if you need to reference its properties for another error within the same subroutine or before another On Error Resume Next statement within the same subroutine.ExampleOn Error Resume Next i = oObjectOne.MyFunction(iVar) If Err.Number <> 0 Then MsgBox "The Error : " & Err.Description & vbCrLf _ on error resume & " was generated in " & Err.Source Err.Clear End If j = oObjectTwo.YourFunction(iVar) If Err.Number <> 0 Then MsgBox "The Error : " & Err.Description & vbCrLf _ & " was generated in " & Err.Source Err.Clear End IfProgramming Tips & GotchasResetting the Err object explicitly using the Clear method is necessary when you use On Error Resume Next and test the value of Err.Number repeatedly. Unless you reset the Err object, you run the very real risk of catching the previously handled error, the details of which are still lurking in the Err object’s properties.The Err object is automatically reset when an On Error Resume Next statement is executed.It is also possible to set the Err.Number property to instead of calling up the Err.Clear method. However, this doesn’t reset the remaining properties of the Err object.When testing the value of Err.Number, don’t forget that OLE servers often return “negative” numbers. Actually internally they’re not really negative; they’re unsigned longs, but because VBScript has ... The best content for your career. Discover unlimited learning on demand for around $1/day. Get 10 Days Free Prev Err Object Next Err.Description Property Explore Tour Pricing Enterprise Government Education Queue App Learn Blog Contact Careers Press R
error in Excel VBA occurs, the properties of the Err object are filled with information. Situation: The program below calculates the square root of numbers. 1. Place a command button on your worksheet and add the following code lines: Dim rng As Range, cell As Range Set rng = Selection For Each cell In rng On Error GoTo InvalidValue: cell.Value = Sqr(cell.Value) Next cell Exit Sub InvalidValue: MsgBox Err.Number & " " & Err.Description & " at cell " & cell.Address Resume Next Result when you select Range("B2:B6") and click the command button on the sheet: Explanation: when an error occurs, the number property of the Err object is filled with an unique error number of the current error and the Description property is filled with the error description of the current error. 2. These descriptions may not be very helpful to the users of your program. You can make the error messages more user friendly by modifying the last part of the macro as follows: InvalidValue: Select Case Err.Number Case Is = 5 MsgBox "Can't calculate square root of negative number at cell " & cell.Address Case Is = 13 MsgBox "Can't calculate square root of text at cell " & cell.Address End Select Resume Next Tip: go through our Select Case program to learn more about the Select Case structure. Result: Do you like this free website? Please share this page on Google+ 4/6 Completed! Learn more about macro errors >Go to Top: Err Object|Go to Next Chapter: String Manipulation Chapter<> Macro Errors Learn more, it's easy Debugging Error Handling Err Object Interrupt a Macro Macro Comments Download Excel File err-object.xls Follow Excel Easy Popular Copyright (c) 2010-2016 www.excel-easy.com. All rights reserved. Microsoft Excel Tutorial | Excel Formulas | How to use VBA in Excel