On Error Goto Resume Next Vbscript
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On Error Resume Next Vbscript W3schools
a minute: Sign up What does the “On Error Resume Next” statement do? up vote 41 down vote favorite 4 I came to some VBScript examples, and I saw the statement On Error Resume Next basically at the beginning of the
On Error Resume Next Vba
script. What does it do? vbscript error-handling share|improve this question edited Feb 4 '10 at 20:42 Helen 18.3k44174 asked Feb 4 '10 at 20:18 Omar 3,364114280 4 It is a very powerful, but dangerous bit of syntax. Be very cautious using it. –Nate Feb 4 '10 at 20:22 2 It makes more sense now. After some functions that can end up in error. They have a function called checkError after them. –Omar Feb 4 '10 at 20:37 add a error handling in vbscript tutorial comment| 6 Answers 6 active oldest votes up vote 56 down vote accepted It basically tells the program when you encounter an error just continue at the next line. share|improve this answer answered Feb 4 '10 at 20:19 David 2,2601523 add a comment| up vote 24 down vote It's worth noting that even when On Error Resume Next is in effect, the Err object is still populated when an error occurs, so you can still do C-style error handling. On Error Resume Next DangerousOperationThatCouldCauseErrors If Err Then WScript.StdErr.WriteLine "error " & Err.Number WScript.Quit 1 End If On Error GoTo 0 share|improve this answer answered Feb 5 '10 at 15:49 Tmdean 6,5002645 add a comment| up vote 19 down vote When an error occurs, the execution will continue on the next line without interrupting the script. share|improve this answer answered Feb 4 '10 at 20:19 Pierre-Alain Vigeant 13.7k44388 add a comment| up vote 8 down vote It means, when an error happens on the line, it is telling vbscript to continue execution without aborting the script. Sometimes, the On Error follows the Goto label to alter the flow of execution, something like this in a Sub code block, now you know why and how the usage of GOTO can result in spaghetti code: Sub MySubRoutine() On Error Goto ErrorHandler REM VB code... REM More VB Code... Exit_MySubRoutine: REM Disable the Error Handler! On Error Goto 0 REM Leave.... Exit Sub ErrorHandler: REM Do some
error handling On Error goto vbscript error handling best practices 0 - Disable error handling Error properties: err.Number (default) err.Source err.Description Examples vbscript goto In the examples below - replace the 'code goes here' line with your VBScript commands. Example 1) Trap http://stackoverflow.com/questions/2202869/what-does-the-on-error-resume-next-statement-do an error On Error Resume Next' code goes hereIf Err.Number <> 0 Then 'error handling: WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " & Err.Description Err.ClearEnd If Example 2) Trap an error or http://ss64.com/vb/onerror.html success On Error Resume Next' code goes hereIf Err.Number = 0 Then WScript.Echo "It worked!" Else WScript.Echo "Error:" WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " & Err.Description Err.ClearEnd If Example 3) Trap an error On Error Resume Next' code goes hereIf Err.Number <> 0 Then ShowError("It failed") Sub ShowError(strMessage) WScript.Echo strMessage WScript.Echo Err.Number & " Srce: " & Err.Source & " Desc: " & Err.Description Err.Clear End Sub “Success is falling nine times and getting up ten” ~ Jon Bon Jovi Related: Syntax - error codes InputBox - Prompt for user input Equivalent in PowerShell: ErrorAction and $errorActionPreference © Copyright SS64.com 1999-2016 Some rights reserved
блоге Вы находитесь здесь: scriptcoding.ru » Программирование на VBSCRIPT » Урок 13 по VBScript: Конструкция On Error http://scriptcoding.ru/2013/07/03/vbscript-on-error-resume-next/ Resume Next Урок 13 по VBScript: Конструкция On Error Resume Next Опубликовано Среда, Июль 3, 2013 - Автор: Владимир http://techinterviewpuzzles.appspot.com/articles/VbScript/on-error-resume-next-in-vbscript-with-example Баталий. В рубрикеПрограммирование на VBSCRIPT В этой статье мы рассмотри обработку ошибок в языке VBScript, а именно объект Err, on error конструкцию On Error Resume Next и On Error Goto 0. Конструкция VBScript On Error Resume Next включает обработку ошибок, а On Error Goto 0 отменяет их обработку. Объект Err не нуждается в предварительном объявлении, и доступен всегда, давайте рассмотри on error resume его методы и свойства: Description - данное свойство содержит описание ошибки. Number - содержит целое число – номер ошибки. Если значение свойства Number ровно нулю – значит, ошибка отсутствует. Source - свойство содержит название приложения, в котором возникла ошибка. Методы Clear – полная очистка информации об ошибке. Стоит обратить внимание, что информация об ошибке автоматически очищается при выполнении операторов On Error Resume Next, Exit Sub и Exit Function. Raise(number, [source, description]) – данный метод позволяет генерировать собственную ошибку времени выполнения. Видим, что тут можно задать параметры, аналогичные по своей принадлежности свойствам самого объекта Err. Видим, что тут является обязательным только первый параметр. Хорошо, теперь давайте рассмотри четыре примера на языке vbscript. Пример 1 '--------------------
VbScript on error resume next in vbscript with example VBScript has no notion of throwing or catching exceptions, but the runtime provides a global Err object that contains the reuslts of the last operation performed. You have to explicitly check whether the Err.Number property is non-zero after each operation. Example On Error Resume Next DoStep1 If Err.Number <> 0 Then WScript.Echo "Error in DoStep1: " & Err.Description Err.Clear End If DoStep2 If Err.Number <> 0 Then WScript.Echo "Error in DoStop2:" & Err.Description Err.Clear End If Although Microsoft? Visual Basic? Scripting Edition (VBScript) provides the Err object, and that object exposes the same methods and properties available in the VBA Err object, writing error handlers using VBScript is not the same as in Visual Basic for Applications (VBA). The primary limitation is due to the limited functionality of the On Error statement in VBScript. In VBScript, you cannot branch to an error handler by using the familiar On Error GoTo ErrorHandler syntax. You can only enable error handling in VBScript by using the On Error Resume Next syntax. The following code excerpt shows the error-handler portion of a script. The script performs simple division and then immediately checks to see if an error occurred and responds accordingly: intResult = intNumerator/intDenominator ' Check for errors as a result of the division. If Err <> 0 Then Select Case Err.Number Case DIVIDE_BY_ZERO If Len(txtDenominator.Value) = 0 Then strErrorResultText = "Missing!" Else strErrorResultText = "'" & txtDenominator.Value & "'" End If strErrorMessage = "Error: " & Err.Number & _ vbCrLf & vbCrLf & "The value you entered in the " _ & "text box was: " & strErrorResultText txtDenominator.Focus Case Else strErrorMessage = "Error: " & Err.Number & _ vbCrLf & vbCrLf & "Unrecognized error!" End Select MsgBox strErrorMessage, CRITICAL_ERROR MSGBOX_OKONLY, _ "Error Type = " & Err.Description End If Tweet Related TopicsMost Viewed Delays, wait, sleep in VbScript with example getElementById in vbscript with example jquery fixed header with scroll jQuery Image Slider With An Accordion getElementById in vbscript with example endswith, startsWith, contains functions in Javascript Please enable JavaScript to view the comments powered by Disqus. facebook Subsc