Error Handling In Vbscript Examples
Contents |
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
Vbscript Clear Error
more about Stack Overflow the company Business Learn more about hiring developers or posting vbs on error goto 0 ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community vbs on error goto Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up VBScript — Using error handling up vote 58 down vote
If Err.number 0 Then
favorite 13 I want to use VBScript to catch errors and log them (ie on error "log something") then resume the next line of the script. For example, On Error Resume Next 'Do Step 1 'Do Step 2 'Do Step 3 When an error occurs on step 1, I want it to log that error (or perform other custom functions with it) then resume at step 2. Is
Error Handling In Vbscript Tutorial
this possible? and how can I implement it? EDIT: Can I do something like this? On Error Resume myErrCatch 'Do step 1 'Do step 2 'Do step 3 myErrCatch: 'log error Resume Next vbscript error-handling share|improve this question edited Oct 1 '08 at 14:13 asked Oct 1 '08 at 14:04 apandit 2,50111831 1 Dylan's response is about as good as VB gets in the Error handling department. This is why I always used Javascript when I could get away with it. –wcm Oct 1 '08 at 14:23 add a comment| 2 Answers 2 active oldest votes up vote 102 down vote accepted 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. 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 'If you no longer want to continue following an error after that block's completed, 'call this. On Error Goto 0 The "On Error Goto
of system administration. However in doing this I came across a gap in the existing Microsoft documentation and in many of the VBscripting books available(1) . vbscript error handling best practices None seem to give a clear and coherent explanation of how error processing
Vbscript Error Handling Line Number
works in VBscript. I think that I’m still a competent VBscript programmer, yet as I dug deeper I found some features exception handling in vbscript that surprised me and that most of our script coders knew even less about this than I did! However, if you think that you already understand how error handling works in VBscript, then try http://stackoverflow.com/questions/157747/vbscript-using-error-handling your knowledge on the following example. Look at the code and write down the error codes that it outputs up to the point where it fails, then compare your list to the answers at the end of this paper(5). I might warn you that I have yet to find anyone who gets it 100% right on the first attempt. On Error Resume Next ' Note that 1/0 generates error http://blog.ellisons.org.uk/article-1 11 -- division by zero ' Note that a(2) generates error 9 -- subscript out of range a = Array (0,1) b = 1/a(0) : Wscript.Echo "(a) = ", Err.Number Err.Clear c = a(2) : Wscript.Echo "(b) = ", Err.Number b = 1/c : Wscript.Echo "(c) = ", Err.Number b = 1/a(2) : Wscript.Echo "(d) = ", Err.Number Wscript.Echo "(e) =", b , Err.Number Wscript.Echo "(f) = ", a(2), Err.Number b = a(0): Wscript.Echo "(g) = ", Err.Number Blah a, 2, true, false : Wscript.Echo "(h) = ", Err.Number Blah a, 2, false, true : Wscript.Echo "(i) = ", Err.Number Blah a, 2, false, false : Wscript.Echo "(j) = ", Err.Number Blah a, 1, true, false : Wscript.Echo "Overall Status =", Err.Number Sub Blah(a, i, trap, cont) If trap Then On Error Goto 0 If cont Then On Error Resume Next b = a(i) c = 1/b End Sub So this paper is really essential reading for anyone who uses VBscript for the automation of server or client administration, ASPs or any other purpose. It provides documentation and guidance on how to code to avoid the pitfalls whilst utilizing the strengths of VBscript error handling. It is divided into 3 sections: Throwing and Catchi
error handling On Error goto 0 - Disable error handling Error properties: err.Number (default) err.Source err.Description Examples In the examples below - replace the 'code goes here' line with your VBScript commands. Example 1) Trap error handling 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 handling in vbscript 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