Error Handling In Excel Vba Macro
Contents |
three flavors: compiler errors such as undeclared variables that prevent your code from compiling; user data entry error such as a
Excel Vba Error Handling Best Practice
user entering a negative value where only a positive number is excel vba error handling in loop acceptable; and run time errors, that occur when VBA cannot correctly execute a program statement. We will excel vba error handling type mismatch concern ourselves here only with run time errors. Typical run time errors include attempting to access a non-existent worksheet or workbook, or attempting to divide by zero. The
Excel Vba Error Handling 1004
example code in this article will use the division by zero error (Error 11) when we want to deliberately raise an error. Your application should make as many checks as possible during initialization to ensure that run time errors do not occur later. In Excel, this includes ensuring that required workbooks and worksheets are present and that
Excel Vba Error Handling Find Method
required names are defined. The more checking you do before the real work of your application begins, the more stable your application will be. It is far better to detect potential error situations when your application starts up before data is change than to wait until later to encounter an error situation. If you have no error handling code and a run time error occurs, VBA will display its standard run time error dialog box. While this may be acceptable, even desirable, in a development environment, it is not acceptable to the end user in a production environment. 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. Your goal should be to prevent unhandled errors from arising. A note on terminology: Throughout this article, the term procedure should be taken to mean a Sub, Function, or Property procedure, and the term exit statement should be taken to mean
generally put more focus on the coding part and getting the desired result but during this process we forget an important thing i.e. Error handling. Error handling is an important part of every code and VBA On Error Statement is excel vba error handling exit sub an easy way for handling unexpected exceptions in Excel Macros. A well written macro is
Excel Vba Error Handling Not Working
one that includes proper exception handling routines to catch and tackle every possible error. Error handling is important because in case of any unexpected excel vba error handling line number exceptions your code doesn’t break. Even if any fatal unexpected error occurs in the code then also you should ensure that the code should terminate gracefully. Definition of VBA On Error Statement: On Error statement instructs VBA Compiler, what http://www.cpearson.com/excel/errorhandling.htm to do in case any runtime exception are thrown. Syntax of On Error Statement: Basically there are three types of On Error statement: On Error Goto 0 On Error Resume Next On Error Goto
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 company Business Learn more about hiring developers or posting ads with us Stack http://stackoverflow.com/questions/6028288/properly-handling-errors-in-vba-excel Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack http://www.globaliconnect.com/excel/index.php?option=com_content&view=article&id=348:excel-vba-errors-error-handling-on-error-resume-satements-exit-statement-err-object&catid=79&Itemid=475 Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Properly Handling Errors in VBA (Excel) up vote 34 down vote favorite 19 I've been working with VBA for quite a while now, but I'm still not so sure about Error Handling. A good article is the one of CPearson.com However I'm still wondering if the error handling way I used to do ErrorHandling was/is completely wrong: Block 1 On Error Goto ErrCatcher If UBound(.sortedDates) > 0 Then // Code Else ErrCatcher: // Code End If The if clause, because if it is true, it will be executed and if it fails the Goto will go into the Else-part, since the Ubound of an Array should never be zero or less, without an Error, this method worked quite well so far. If I understood it right it should be like this: Block 2 On Error excel vba error Goto ErrCatcher If Ubound(.sortedDates) > 0 Then // Code End If Goto hereX ErrCatcher: //Code Resume / Resume Next / Resume hereX hereX: Or even like this: Block 3 On Error Goto ErrCatcher If Ubound(.sortedDates) > 0 Then // Code End If ErrCatcher: If Err.Number <> 0 then //Code End If The most common way I see is that one, that the Error "Catcher" is at the end of a sub and the Sub actually ends before with a "Exit Sub", but however isn't it a little confusing if the Sub is quite big if you jump vice versa to read through the code? Block 4 Source of the following Code: CPearson.com On Error Goto ErrHandler: N = 1 / 0 ' cause an error ' ' more code ' Exit Sub ErrHandler: ' error handling code' Resume Next End Sub Should it be like in Block 3 ? Thank you for reading my question Greetings skofgar excel vba share|improve this question edited Jun 28 '14 at 13:37 asked May 17 '11 at 8:38 skofgar 6842816 7 rather than risk throwing an error with If Ubound(.sortedDates)>0 use If IsArrayAllocated(.sortedDates) = TRUE –osknows May 17 '11 at 8:53 Wow! that was fast :-) - thank you, that makes the On Error Goto unnecessary here... –skofgar May 17 '11 at 8:56 But if it wasn't an array check.. though I can't of any other case.. I think my question is answered like this - there's no way to vote up your comment is the
Errors & Error Handling, On Error & Resume Satements, Exit Statement, Err Object ------------------------------------------------------------------------------------------------- Contents: VBA Erros & Error Handling Error Handling Setting, in VBE Error Handler On Error Statements Using an Exit Statement Error Handling in Nested Procedures & The Resume Statement Get Information from the Error Object Raise Method of the Err Object: Generate a Run-time error ------------------------------------------------------------------------------------------------- Error Handling determines what is to be done next on the occurrence of an error. On encountering a run-time error, an On Error statement enables or disables an error-handling routine within a procedure. A Resume statement can only be used in an error-handling routine - it resumes execution at a sepcified point after the error-handline routine finishes. You can get information on the error from the properties of the Error object - this object is the Err Object. In this section, we cover: VBA Erros & Error Handling In vba programming you can have Syntax Errors or Run-time Errors. An error handler determines what action is to be taken within a procedure, on the occurrence of a run-time error. A syntax error occurs when you enter a line of code which is not allowed or recognized by Visual Basic. You will encounter a syntax error on misspelling a keyword or a named argument, for incorrect punctuation (ex. not specifying a comma as a placeholder for the omitted argument), use an undefined procedure, and so on. These errors are easier to locate as the Code Editor points them out at the time you are writing your code. A run-time error occurs at the time during which your code is running, that is after you have created your macro. There could be an error in your programming due to incorrect logic used in your code that prevents it from doing what you intended and may stop code execution, for example, if your code attempts to divide a value by zero. Another reason for an error which may cause even a valid code to crash could be a condition not being met, say, a reference to a worksheet in your code which has been deleted by the user. Other examples when a run-time error can occur are: on using incorrect variable names or variable types; if your code goes into an infinite loop; using a value or reference outside the allowabl