Add Error Checking Vbscript
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Vbscript On Error Resume Next
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Vbscript Error Handling Best Practices
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Vbscript Error Handling Line Number
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VBScript in a Nutshell by Matt Childs... Published by O'Reilly Media, Inc. VBScript in a Nutshell Preface error handling in vbscript tutorial Why This Book? Who Should Read This Book? How This Book vbscript on error continue Should Be Used How This Book Is Structured Conventions in This Book How To Contact Us I. vbscript goto The Basics 1. Introduction 2. Program Structure 3. Data Types and Variables 4. Error Handling and Debugging 5. VBScript with Active Server Pages 6. Programming Outlook Forms https://technet.microsoft.com/en-us/library/ee692852.aspx 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 Error Handling Error handling does not involve finding errors in your scripts. Instead, use error handling techniques to allow your program to continue executing even though a https://www.safaribooksonline.com/library/view/vbscript-in-a/1565927206/ch04s02.html potentially fatal error has occurred. Ordinarily, all runtime errors that are generated by the VBScript engine are fatal, since execution of the current script is halted when the error occurs. Error handling allows you to inform the user of the problem and either halt execution of the program or, if it is prudent, continue executing the program.The On Error Resume Next StatementThere are two main elements to error handling in VBScript. The first is the On Error statement, which informs the VBScript engine of your intention to handle errors yourself, rather than to allow the VBScript engine to display a typically uninformative error message and halt the program. This is done by inserting a statement like the following at the start of a procedure:On Error Resume NextThis tells the VBScript engine that, should an error occur, you want it to continue executing the program starting with the line of code which directly follows the line in which the error occurred. For example, in the simple WSH
error handling On Error goto 0 - Disable error handling Error properties: err.Number (default) err.Source err.Description Examples http://www.herongyang.com/VBScript/Error-Handling-On-Error-Resume-Next.html 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 vbscript error handling 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
provides a tutorial example on how to use the 'On Error Resume Next' statement to turn on error handling flag. You can use Err.Number > 0 to test if there is any runtime error has been raised or not. We have seen what happens when the error handling flag is turned off in the previous section. Now let's see how the "On Error Resume Next" statement should be used: By default, the error handling flag is turned off. You can turn on the error handling flag at time your want by entering the "On Error Resume Next" statement. Once the error handling flag is turned on, execution will not be stopped when a runtime error occurs. You can use the condition of (Err.Number>0) to determine a runtime error has occurred or not. If a runtime error has occurred, use Err object properties to get more information about the error: Err.Number - "Err" object property containing the error code. Err.Description - "Err" object property containing the error description. Err.Source - "Err" object property containing error source identification. I have modified the VBScript example used in the previous section to try to check the "Err" object by myself with the error handling flag turned on:
Run this example code in IE, you will get: There is no error at this time. Before statement: x = 1/0 Before statement: y = CInt(777777) Before statement: z = 1 + "2nd" End of test A runtime error has occurred: Err.Number = 13 Err.Description = Type mismatch Err.Source = Microsoft VBScript runtime error The output confirms that: When CheckError() was called at the beginning, Err.Number is 0, indicating that there is no runtime error. When the first runtime error occurred on