Error Handling Vbscript Tutorial
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Vbscript Error Handling Best Practices
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Training Catalog Class Locator Microsoft Virtual Academy Free Windows Server 2012 courses Free Windows 8 courses SQL Server training Microsoft Official Courses On-Demand Certifications Certification overview MCSA: Windows 10 Windows Server Certification (MCSE) Private Cloud Certification (MCSE) SQL Server Certification (MCSE) Other resources TechNet Events Second shot for certification Born To Learn blog Find technical communities in your area Support Support options vbscript resume on error For business For developers For IT professionals For technical support Support offerings More support Microsoft Premier Online TechNet Forums MSDN Forums Security Bulletins & Advisories Not an IT pro? Microsoft Customer Support Microsoft Community Forums United States (English) Sign in Home Library Wiki Learn Gallery Downloads Support Forums Blogs We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Script Center VBScript Doctor Scripto’s Script Shop Doctor Scripto’s Script Shop To Err Is VBScript – Part 1 To Err Is VBScript – Part 1 To Err Is VBScript – Part 1 Bring in da Subs, Bring in da Funcs - Building scripts with procedures Controlling pest-ware with asynchronous event monitoring Greg Smacks Down Procedures Inventorying Windows XP Service Packs - Part 1 Inventorying Windows XP Service Packs - Part 2 Inventorying Windows XP Service Packs - Part 3 - Scripting the Rollout It's 2 a.m. Do you know where your processes are? It's 2 a.m. Do you know where your processes are? - The Sequel Metering Application Usage with Asynchronous Event Monitoring Out of Sync: The Return of Asynchron
Enabling VBScript - Placement VBScript - Variables VBScript - Constants VBScript - Operators VBScript - Decisions VBScript - Loops VBScript - Events VBScript - Cookies
Vbscript On Error Resume Next
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VBScript Advanced VBScript - Procedures VBScript - Dialog Boxes VBScript - Object Oriented VBScript - Reg Expressions vbscript goto VBScript - Error Handling VBScript - Misc Statements VBScript Useful Resources VBScript - Questions and Answers VBScript - Quick Guide VBScript - Useful Resources VBScript - Discussion Selected Reading https://technet.microsoft.com/en-us/library/ee692852.aspx 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. https://www.tutorialspoint.com/vbscript/vbscript_error_handling.htm 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
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) . None seem to give a clear and coherent explanation of how error http://blog.ellisons.org.uk/article-1 processing works in VBscript. I think that I’m still a competent VBscript programmer, yet as I dug deeper I found some features that surprised me and that most of our script coders knew even less about this than I did! However, http://qaautomationqtp.blogspot.com/2013/04/error-handling-using-vbscript-in-qtp.html if you think that you already understand how error handling works in VBscript, then try 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 error handling 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 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) vbscript error handling = ", 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 Catching Errors. This section discusses how the VBscripting engine handles errors when one occurs in a script. It draws heavily on Eric Lippert’s excellent blog series and specifically on a set of three blogs on the 19th, 20th and 23rd Aug 2004. I have expanded these and added various clarifications within my own overall structure(2). Interpreting the Error Code and Description. Once the scripting engine detects an error, it records the details in the Err object
toError Handling using vbscript in QTP: Unexpected events during a test run disrupt a test or may give invalid test results. For example, during a test run, an application error may occur. This error does not permit the automated test to navigate to the feature, screen, or module that needs to be tested. These unexpected errors and events are called exceptions.It becomes important to handle these exceptions so that we are able to continue with automated testing even in unattended mode. Handling of exception in a manner so that test execution is uninterrupted is known as error handling. Following are the ways in which error handling can be implemented in QTP. •VB Script Error Handling oUsing Test Settings oUsing On Error Statement oUsing Err Object Properties oUsing Exit Statement •Recovery Scenarios Test Settings : Error Handling Error Handling can be defined in Test Settings through File>Settings>Run as shown below: It defines the possible actions in case anerror is encountered during run session Test Settings for error handling Using On Error Statement •On Error Statement On Error statement, which informs theVBScriptengine of intention to handle errors by self, rather than to allow theVBScriptengine 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 Next: On Error Resume Nexttells theVBScriptengine that, should an error occur, we want it to continue executing the program starting with the line of code that directly follows the line in which the error occurred. •On ErrorGoto 0: This turns off the error handling Err Object Properties and Methods TheErrobject is part of theVBScriptlanguage and contains information about the last error to occur.Some of the most useful properties and method of Err object are as follows: Err.Number Property:TheNumberproperty returns or sets a numeric value specifying an error. Number is theErrobject's default property.If the value ofErr.Numberis 0, no error has occurred. Err.Description Property:TheDescriptionproperty