On Error Goto Visual Basic 6.0
Database Guide User login Username: * Password: * Request new password Home › Tutorials Error handling in Visual Basic Level: Error handling is essential to all professional applications. Any number of run-time errors can occur, and if your program does not trap them, the VB default action is to report the error and then terminate the program (often resulting in the end user calling you and complaining, "Your program kicked me out!"). By placing error-handling code in your program, you can trap a run-time error, report it, and let the user continue. Sometimes the user will be able to correct the error and sometimes not, but simply allowing the program to crash is not acceptable. You should generally place error-handling code in any Sub or Function that accesses files or databases. Your code will typically interrogate the Number and Description properties of the built-in VB Err object in an error-handling routine set up with the On Error statement. In this section, we will look at the following statements: On Error GoTo label On Error Resume Next Following is a brief tutorial in error-handling. To perform this tutorial, you should have a floppy disk handy. Also, in the VB IDE, make sure that the Break on Unhandled Errors option is set under Tools à Options à General. STEPS: 1. Start a new project. 2. Place four command buttons on the form. Name them and set their Captions as follows: Name Caption cmdCrash Crash cmdGoToLabel GoTo Label cmdGoTo0 GoTo 0 cmdResumeNext Resume Next Your form should look something like this: 3. Code the cmdCrash_Click event as follows: Private Sub cmdCrash_Click() Open "A:\JUNK.TXT" For Input As #1 MsgBox "File was opened successfully" Close #1 End Sub 4. Place your floppy disk in the A: drive. Run the program and click the Crash button. Assuming that you do not have a file called "JUNK.TXT" on your A: disk, the program will "bomb" with the code/message "53 – File Not Found". If you don't have a disk in drive A:, the code/message will be "71 – Disk Not Read
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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 more about Stack Overflow the http://stackoverflow.com/questions/2757477/trap-error-or-resume-next company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Trap error or 'Resume Next' up vote 4 down vote favorite I realise this is an older programming environment, on error but I have to clean up some VB6 code and I am finding that most of it uses: On Error Resume Next What is the general consensus about the use of On Error Resume Next? Surely, if there is an error, you would want the app to stop what it was doing, rollback any data changes, and inform the user of the error, rather than just resuming. When is it a good idea on error goto to use On Error Resume Next? vb6 error-handling share|improve this question edited Apr 9 '12 at 18:59 Kate Gregory 16.1k74478 asked May 3 '10 at 10:46 CJ7 4,99232114220 See stackoverflow.com/questions/2062058/… –Daniel Daranas May 3 '10 at 10:50 3 Re-reading your question: "I am finding most of it uses..." is a bad sign. There is no good reason for the promiscuous use of On Error Resume Next. –Joel Goodwin May 3 '10 at 14:53 Q:When is it a good idea to use On Error Resume Next?A:when you are a vb6 geek. –Behrooz May 5 '10 at 11:39 add a comment| 3 Answers 3 active oldest votes up vote 4 down vote accepted I have found it useful in functions where an error would not warrant the user being interrupted with the issue. A good example is in the resize event. If you make a mistake or there's a problem in the resize event then you probably don't want the user to see this, as it probably wouldn't affect functionality. I would say in general, use it sparingly. share|improve this answer answered May 3 '10 at 20:16 pm_2 4,8152291176 1 +1. Use it sparingly and keep the scope as short as possible. Here's a nice story about how On Error Resume Nex
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