How To Handle Error In Asp Vbscript
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Asp On Error Goto 0
Is try-catch like error handling possible in ASP Classic? up vote 26 down vote favorite 9 What options are there in ASP Classic for error handling? For example: I'm using the Mail.SendMail function but when switching on the testing server it classic asp global error handling doesn't work, which is normal. I want to test if mailing is possible, if not then continue and/or show a message. Any ideas? error-handling asp-classic share|improve this question edited Nov 19 '11 at 2:52 casperOne 58.1k10127202 asked Jan 23 '09 at 11:08 Sander Versluys 23.1k186785 add a comment| 8 Answers 8 active oldest votes up vote 37 down vote accepted There are two approaches, you can code in JScript or VBScript which do have the construct or you can fudge it in your code. classic asp throw exception Using JScript you'd use the following type of construct: In your ASP code you fudge it by using on error resume next at the point you'd have a try and checking err.Number at the point of a catch like: <% Dim i ' Turn on error Handling On Error Resume Next 'Code here that you want to catch errors from ' Error Handler If Err.Number <> 0 Then ' Error Occurred / Trap it On Error Goto 0 ' But don't let other errors hide! ' Code to cope with the error here End If On Error Goto 0 ' Reset error handling. %> share|improve this answer edited Oct 17 '12 at 11:42 Shadow Wizard 49.2k1385130 answered Jan 23 '09 at 11:19 Wolfwyrd 10.3k42961 2 +1. Javascript. If you need it, forget VBscript use javascript. –AnthonyWJones Jan 25 '09 at 23:24 add a comment| up vote 7 down vote A rather nice way to handle this for missing COM classes: Dim o:Set o = Nothing On Error Resume Next Set o = CreateObject("foo.bar") On Error Goto 0 If o Is Nothing Then Response.Write "Oups, foo.bar isn't installed on this server!" Else Response.Write "Foo bar found, yay." End If share|improve this answer answered Sep 9 '09 at 0:21 svinto 9,75132838 add a comment| up vote 6 down vote Regarding Wolfwyrd's anwer: "On Error Resume Next" in fact turns error handling off! Not on. On Error Goto 0
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Vbscript On Error Goto
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Error Handling In Vbscript Tutorial
In Other Languages Handling Errors In Other Languages Handling Errors in VBScript Handling Errors in VBScript Handling Errors in VBScript Handling Errors in VBScript Handling Errors in Visual C++ Handline http://stackoverflow.com/questions/472558/is-try-catch-like-error-handling-possible-in-asp-classic Errors in Visual J++ Handling Errors in JScript 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. Handling Errors in VBScript There is little difference between the methods used in Visual Basic and those used with VBScript. The primary difference is https://msdn.microsoft.com/en-us/library/ms675540(v=vs.85).aspx that VBScript does not support the concept of error handling by continuing execution at a label. In other words, you cannot use On Error GoTo in VBScript. Instead, use On Error Resume Next and then check both Err.Number and the Count property of the Errors collection, as shown in the following example: Copy
Error Handling Example (VBScript)
<% Dim cnn1 Dim errLoop Dim strError On Error Resume Next ' Intentionally trigger an error. Set cnn1 = Server.CreateObject("ADODB.Connection") cnn1.Open "nothing" If cnn1.Errors.Count > 0 Then ' Enumerate Errors collection and display ' properties of each Error object. For Each errLoop In cnn1.Errors strError = "Error #" & errLoop.Number & "" & _ " " & errLoop.Description & "
" & _ " (Source: " & errLoop.Source & ")" & "
" & _ " (SQL State: " & errLoop.SQLState & ")" & "
" & _ " (NativeError: " & errLoop.NativeError & ")" & "
" If errLoop.HelpFile = "" Then strError = strError & _ " No
Forums Links DISCUSSIONARCHIVES DISCUSSIONARCHIVES2 DISCUSSIONARCHIVES3 BLOG We didn't realize the site was so popular. Other Stuff How To Use On Error Resume http://www.powerasp.net/content/new/on-error-resume-next.asp Next Often when using ASP or Active Server Pages with VBScript you will find it necessary to check for errors when you do certain things that may fail and then handle it accordingly. Things like https://www.tutorialspoint.com/vbscript/vbscript_error_handling.htm opening a database connection or writing to a text file come to mind. Generally if an error is encountered in your .asp file, the processing of your script stops and an error message is on error returned to the browser. If you want to continue processing your page even if an error is encountered, include the following line at the beginning of your .asp file: <% On Error Resume Next %> That being said just ignoring errors in your code is not a very good idea. What you really want to do is handle the error in some way. The example below opens a database connection asp on error and shows you how to trap a potential error and do whatever you want because of it. In this case we are simply displaying the error. <% ConnectionString = "DBQ=c:\inetpub\wwwroot\mysite\data\mydatabase.mdb;Driver={Microsoft Access Driver (*.mdb)};" '*** This code checks the ConnectionString info you entered and reports back the error code if it is not ok Err.Clear On Error Resume Next Set ConnPasswords = Server.CreateObject("ADODB.Connection") ConnPasswords.Open ConnectionString If Err.Number <> 0 Then Response.Write (Err.Description& "
") Response.Write("This means there is most likely a problem with the" & vbCrLf) Response.Write("""ConnectionString"" info that you specified.
" & vbCrLf) Response.End End If On Error GoTo 0 %> We put the "On Error GoTo 0 at the end because that will essentially end the "on error resume next" That is something you want to do so any later errors in your application do not get ignored without you knowing about it. Below is another example. In this example our application logs user info in a text file when they sign in to a site. We add "On Error Resume Next" here simply so no nasty error message come up if by chance write permissions to the text file do not exist. <% Set ObjMyFile = Cr
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 not catch those errors, because it depends on your business requirement what type of logic you want to put in your program. For example, dividing a number by zero or a script that is written which enters into infinite loop. Err Object Assume if we have a runtime error, then the execution stops by displaying the error message. As a developer, if we want to capture the error, then Error Object is used. Example In the below example, Err.Number gives the error number and Err.Description gives error description. Previous Page Print PDF Next Page Adverti