Error Handling In Vb 6
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Error Handling Visual Basic 6
your program does not trap them, the VB default action is to report the error handling visual basic error and then terminate the program (often resulting in the end user calling you and complaining, "Your program kicked me out!"). error handling c# 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
Vb6 Throw Error
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
Vb6 Error Handling Best Practice
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 Ready". 5. Code the cmdGoToLabel_Click event: Copy and paste the code from the Crash sub, and add statements so that the cmdGoToLabel_Click Sub looks like the following (the new st
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Error Handling Techniques In Vb
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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 http://stackoverflow.com/questions/116289/what-is-the-better-way-to-handle-errors-in-vb6 Overflow the company Business Learn more about hiring developers or posting ads with us Stack http://www.aivosto.com/vbtips/errorhandling.html Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up what is the better way to handle errors in VB6 up vote 12 down vote favorite 6 error handling I have VB6 application , I want to put some good error handling finction in it which can tell me what was the error and exact place when it happened , can anyone suggest the good way to do this vb6 error-handling share|improve this question edited Sep 22 '08 at 17:36 Onorio Catenacci 9,01575386 asked Sep 22 '08 at 17:34 RBS 1,29692330 I removed the "in" tag. –Onorio Catenacci error handling visual Sep 22 '08 at 17:36 I also changed the two separate "error" and "handling" tags to "error-handling" –Onorio Catenacci Sep 22 '08 at 17:37 add a comment| 7 Answers 7 active oldest votes up vote 2 down vote accepted ON ERROR GOTO and the Err object. See this discussion. share|improve this answer answered Sep 22 '08 at 17:42 Joe Skora 8,97342430 add a comment| Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Subscribed! Success! Please click the link in the confirmation email to activate your subscription. up vote 27 down vote First of all, go get MZTools for Visual Basic 6, its free and invaluable. Second add a custom error handler on every function (yes, every function). The error handler we use looks something like this: On Error GoTo {PROCEDURE_NAME}_Error {PROCEDURE_BODY} On Error GoTo 0 Exit {PROCEDURE_TYPE} {PROCEDURE_NAME}_Error: LogError "Error " & Err.Number & " (" & Err.Description & ") in line " & Erl & _ ", in procedure {PROCEDURE_NAME} of {MODULE_TYPE} {MODULE_NAME}" Then create a LogError function that logs the error to disc. Next, before you release code add Line Numbers to every function (this is also built into MZTo
of losing unsaved data. If it's not her lucky day, her computer jams and the database corrupts. The system won't start up again. There is no backup. Naturally, she calls you (or your boss) yelling and demanding immediate action. You don't even know the error message. You get sick of such a user and never want to deal with her again. Tired of problems, you quit your developer career and start making burgers instead. Benefit from errors There's nothing positive about errors, is there? How about this way to look at it: When an error hits the user, your application reacts to it in a reasonable way, protecting the data and reporting the error to you. You find the cause of the fault and provide a fix in a short time. The user is amazed by your performance and buys a new project from you. You're the best choice since not only is your software great but you also give the best service. This kind of a paradise is not so far from the reality. With proper error handling you protect the users and get extensive information for fixing the bugs. This article is written with Visual Basic 6.0 in mind. The concepts presented are universal and not tied to a specific language or environment. VB Watch Protector is an automated tool that provides VB applications with the error handling features suggested by this article. What should your app do when an error occurs? When a run-time error occurs, the default way for Visual Basic to handle it is to display an error message and crash. Would you design your apps this way? Instead of the default way, you should trap the error, display a detailed description of what happened and give the user some options to cope with the failure. Retry the operation. If you can't overwrite a file because it's read-only, the user can possibly fix this herself and retry it. Ignore the error and try to continue execution. This is often a practical solution, provided that the code copes with the incompletely executed statement. Always ignore this error. This option is very handy if the same error keeps coming up repeatedly. This could happen if the error occurs in a loop or a recurring event, such as a form's Paint event or a Timer event. Without the option to Always ignore an error, the only way to survive is to quit the program. Quit the program. If nothing else helps, there should be a safe way out. Ideally, this option closes open files and database connections and also frees any used resources. Report the error to the developer(s) or log it automatically. Depending on the case, you could also offer extra options such as try