If you intend to reuse code, like subroutines or user defined functions, it is essential to describe the functionality in comments. Return code 0 - Terminated Process Name: freecell.exe Process ID: 4028 Attempting to terminate process ... The WSH version required for a particular command can be found in the page's second table. I urge you to try Denis St-Pierre's ByVal/ByRef test script to build an understanding of the concepts. his comment is here
Syntax errors Syntax errors, also called parsing errors, occur at interpretation time for VBScript. Why is there a white line on Russian fighter jet's instrument panel? Error Handling and Debugging Next Common Problems Areas, and How to Avoid Them Explore Tour Pricing Enterprise Government Education Queue App Learn Blog Contact Careers Press Resources Support Twitter GitHub Facebook Figure 4.6, for instance, shows the Alert box that is displayed when the user enters a value of 13 into the text box.Example 4-10. Calling the Err.Raise Method
You may have noticed that many scripters use the first character, or the first 3 characters, of variable names to specify the data type: objFSO for a (FileSystem) object, intDaysPerWeek for Err Object Assume if we have a runtime error, then the execution stops by displaying the error message. Because of this, any script that runs against more than one machine is likely to use some variant of this kind of error checking. The explanation for each status code is taken from the Win32_PingStatus topic in the WMI SDK Listing 8: Ping Remote Machine and Display Ping Status Copy On Error Resume Next strComputer
For example, what if we check for a WMI remote binding error or a printer connection error in more than one place in the 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. When you call most methods in WMI, the method returns a numeric code that indicates the outcome of the call. Vbscript Error Codes Using a procedure for error-handing code is made easier by a convenient quality of the VBScript Err object: it automatically has global scope.
Never assume a Windows version. Error Checking Visual Basic Is it really that important to know? Even if the script finds the classes, methods and properties it's seeking, it's still not home free. Check This Out Back in the main code, the execution continued because the error handling flag was turned on for the main code.
Here is the modified VBScript example to catch the first runtime error in a section of code:
Vbscript Goto The two descriptions, "Not found" and "Invalid object path," by themselves might not be clear enough about what caused the error. The highest/latest version you wrote down is the minimum WSH version required to run your script. share|improve this answer edited Oct 1 '08 at 14:36 answered Oct 1 '08 at 14:11 Dylan Beattie 33.3k2095154 9 :( ...
Error Checking Visual Basic
It's 2 a.m. this content Someone out there has probably come up with a sophisticated equation that can help decide the optimum amount of error-checking to do in a script, but we haven't found it yet. For example, in the simple WSH script:On Error Resume Next x = 10 y = 0 z = x / y Alert za “Cannot divide by Zero” error is generated on 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:" & Vbscript Error Handling
It may save you days of stressful debugging.
Select Case displays a message that depends on the value of intReturn. Dividing the code into logical subroutines and functions will improve readability of your script, and thus will make maintenance a lot easier. You can put your unsafe part of code eg into a function, which will interrupted immediately if error occurs, and call this function from sub containing precedent OERN statement. Vbscript Error Handling Best Practices close WindowsWindows 10 Windows Server 2012 Windows Server 2008 Windows Server 2003 Windows 8 Windows 7 Windows Vista Windows XP Exchange ServerExchange Server 2013 Exchange Server 2010 Exchange Server 2007 Exchange
Linked 0 kill the Excel.exe from the .vbs file 2 How do I close Word (or other app) if an error occurs in a VBScript? 0 “Object cannot be identified” or Again, check it! strService = "Alerte" strPrinter = "FakePrinter" Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") If Err = 0 Then WScript.Echo vbCrLf & "Bind success" WScript.Echo vbCrLf & "Computer: " & strComputer check over here Without testing further, my guess is utilising objects clears err as a by product of their internal operations. –user66001 Dec 2 '14 at 17:45 @user66001 Agreed but still safer
Language Elements by Category B. Could intelligent life have existed on Mars while it was habitable? Because printers may not be installed or may be unavailable for other reasons, code that works with them is also a good candidate for error checking. If you want to catch the first runtime error is a large section of code, you need to: Enter the "On Error Resume Next" statement in the main code to turn
Never assume a script runs with administrative rights. The Basics 1. These techniques work with object references, so you would want to use them after GetObject, CreateObject or any other call that returns an object. Line 12 is a perfectly valid assignment statement that always executes without error, but the Err.Number property still contains the error number from the previous error in line 5.