asynchronous may make it not so much of an issue. 0 LVL 65 Overall: Level 65 VB Script 59 Visual Basic Classic 24 ASP 9 Message Active today Expert Register now Not a member yet? One of the features of VBScript error processing is that if a error is thrown it can be caught by a calling routine but it will have little information as to In this case you must ensure that your error handling block fixed the problem that caused the initial error. Source
He can also be found teaching classes on the Web, where he has successfully taught technology skills to thousands of learners, with his own special brand of knowledge, experience, wit, and Please remember that we are writing scripts to carry out automation of system administration in a live production estate so the last thing that we should allow is the situation where There is a small chance that the log open might fail because some other script is running which has also opened the log. Better to have redundant error checking than too little.
We should have verifed that data is good data or at least as good as we think it should be. On Error GoTo ErrHandler: Worksheets("NewSheet").Activate Exit Sub ErrHandler: If Err.Number = 9 Then ' sheet does not exist, so create it Worksheets.Add.Name = "NewSheet" Join Now For immediate help use Live now! But before that, what the heck is up with the second statement?
Typical run time errors include attempting to access a non-existent worksheet or workbook, or attempting to divide by zero. On Error Resume Next Vbscript W3schools wandergeist Ars Praefectus Registered: Jun 1, 2001Posts: 3412 Posted: Fri Jul 14, 2006 10:55 am Depends on what you want to do. When On Error Goto 0 is in effect, it is the same as having no enabled error handler. http://stackoverflow.com/questions/3520178/better-way-to-retry-a-statement-that-threw-an-exception-in-vb-net Errors do occur; operators do invoke scripts with the wrong parameters; external service failures such as network brown-out can cause scripts to fail in bizarre ways.
These ensure that any Err status is cleared and Resume Next is turned off. ` Template One On Error Resume Next =
However, the error may have side effects, such as uninitialized variables or objects set to Nothing. http://ss64.com/vb/onerror.html Not the answer you're looking for? On Error Resume Next Vbscript Example evil Aug 19 '10 at 10:20 @dr. Error Handling In Vbscript Tutorial Or store the result it finds in memory and then write it to the text file when it is free.
Visual Basic has an error handling mode which VBScript does not -- VB can branch to a labeled or numbered statement. (Remember line numbers? I am afraid it doesn't work. Using your example of testing this with one script that continually accesses the file, and another that tries Go to Solution 21 Comments LVL 35 Overall: Level 35 Visual Basic have a peek here This is not normally a good idea.
one thing i did notice is it always suceeded on the second attempt. On Error Goto 0 If the code causing the error is in a procedure with an On Error statement, error handling is as described in the above section. Now for the part that is confusing me: When Cancel is chosen, the code also redirects to CM while I want to exit the sub.
What is mathematical logic? The goal of well designed error handling code is to anticipate potential errors, and correct them at run time or to terminate code execution in a controlled, graceful method. The On Error Goto 0 (note that's a zero, not an O) isn't strictly necessary, but it allows you to see other errors you might have introduced in your code. On Error Resume Next Vbscript In Qtp Instead, I would write everything into a message queue or database queue table, then have a service constantly monitoring the queue for new entries.
When you designed your script there may be specific ‘errors’ that you anticipate and where you can define a rule for handling the error and continuing processing. First Name Please enter a first name Last Name Please enter a last name Email We will never share this with anyone. Finger trouble can cause disasters, so where appropriate put in sensible double checks and cross checks. Check This Out Have you verified the IUSR_
Wscript.Quit End If ...
C'est super-beaucoup-de-fromage, n'est-ce pas? deer in German: Hirsch, Reh How to defeat the elven insects using modern technology? In case of a loop, first time error handler will work but later on it will give you an error. You can apply tolerances here because you are trying to catch the simple finger trouble that can cause serious damage.
She also runs a web development company in the United Kingdom. Rob. 0 Message Author Comment by:BidwellsIT2007-07-03 Hi Guys.. Best regards, Trowa Reply Report rizvisa1 4482Posts Thursday January 28, 2010Registration date ContributorStatus February 12, 2016 Last seen - May 31, 2011 09:47AM You are very welcome Trowa. This is to remove the On Error goto ErrorMessage handle.
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