Excel Vba Error Function
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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 on error vba minute: Sign up VBA Excel Error Handling - especially in functions - Professional Excel Development Style up vote 5 down vote favorite 4 I got the book "Professional Excel Development" by Rob Bovey and it is opening up my eyes. try catch vba I am refitting my code with error handling. However, there is a lot I don't understand. I especially need to know how to correctly use it in functions. I use Bovey's rethrow version of the error handler (at bottom). When I started, I was using the basic boolean (non-rethrow) method and turned my subroutines into boolean functions. (P.S. I am switching back to the boolean method based on the answer.) I need guidance on how to fit functions into this scheme. I
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want them to return their real values (a string or double, e.g., or -1 if they fail in some cases) so I can nest them in other functions and not just return an error handling boolean. This is what a typical subroutine call to bDrawCellBorders(myWS) would look like within an entry point. Sub calls seem to be working well. (I.e. it is a subroutine that was turned into a function only so it can return a boolean to the error handling scheme.) Sub UpdateMe() ' Entry Point Const sSOURCE As String = "UpdateMe()" On Error GoTo ErrorHandler Set myWS = ActiveCell.Worksheet Set myRange = ActiveCell myWS.Unprotect ' lots of code If Not bDrawCellBorders(myWS) Then ERR.Raise glHANDLED_ERROR ' Call subroutine ' lots of code ErrorExit: On Error Resume Next Application.EnableEvents = True myWS.Protect AllowFormattingColumns:=True Exit Sub ErrorHandler: If bCentralErrorHandler(msMODULE, sSOURCE,,True) Then ' Call as Entry Point Stop Resume Else Resume ErrorExit End If End Sub However, I don't know how to extend this to real functions. This is based off an example in the book that was drawn up for a subroutine, and I just switched it to a function. Questions: * How do I call it? Is it simply like x = sngDoSomeMath(17) * Will its error handling function properly? * Where is the right place or places to call the error handling routine with bReThrow=true? Public Function sngDoSomeMath(ByVal iNum As Integer) As Single Dim sngResult As Single Const sSOURCE As String = "s
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Vba Error Numbers
4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to Trigger a Error from a VBA function up vote 3 down vote favorite 1 I need http://stackoverflow.com/questions/19042604/vba-excel-error-handling-especially-in-functions-professional-excel-developm to trigger(return) an error event from a VBA function, then the calling function of this function can trigger On Error Go to call. E.g function Test() On Error Go to myError: TestErr() Exit Function myerror: Test = "Error Triggered" End Function Function TestErr() ?? 'How to Trigger error here End Function Thank You excel vba share|improve this question asked Jun 16 '10 at 6:06 nimo 691312 add a comment| 3 Answers 3 http://stackoverflow.com/questions/3051051/how-to-trigger-a-error-from-a-vba-function active oldest votes up vote 8 down vote accepted Err.Raise 5, "optional error source" , "optional error description" MSDN reference http://msdn.microsoft.com/en-us/library/aa164019%28office.10%29.aspx#odc_tentipsvba_topic3 share|improve this answer edited Jun 16 '10 at 17:24 answered Jun 16 '10 at 6:09 Russel Yang 799512 +1 for the clean way –RC. Jun 16 '10 at 6:10 +1: Yes, the clean way –A9S6 Jun 16 '10 at 6:21 I think there should be two commas after the '5'. The second argument is for Source, the third for Description. –Dick Kusleika Jun 16 '10 at 14:55 Yes, it should be two commas, I updated my response. thanks. –Russel Yang Jun 16 '10 at 17:25 add a comment| up vote 1 down vote Dirty way: 1 / 0 share|improve this answer answered Jun 16 '10 at 6:09 RC. 29.2k65488 Haha!! I initially thought about this when I saw the question –A9S6 Jun 16 '10 at 6:11 add a comment| up vote 1 down vote Not what you asked, but note that if you want to return an error to a cell from a UDF, use CVErr. Like Test = CVErr(xlErrNA) to return #NA share|improve this answer answered Jun 16 '10 at 14:58 Dick Kusleika 22.1k22647 add a comment| Your Answer draft saved
of the function is:Error( [ErrorNumber] )Where [ErrorNumber] is an optional integer argument representing the required error number.If the [ErrorNumber] argument is omitted, the Error function returns the most recent run-time error.Note that:If the [ErrorNumber] argument is zero, the Error function http://www.excelfunctions.net/vba-error-function.html returns an empty String.If the [ErrorNumber] argument is omitted and there have not http://www.functionx.com/vbaexcel/Lesson26.htm been any run-time errors so far, the Error function returns an empty String.VBA Error Function ExamplesExample 1The following VBA code uses the Error function to get the error messages for the error codes 5 and 11.The last call to the Error function has no argument and so returns the most recent run-time error (none in vba error this case).' Display the error messages for different error codes.Dim errMsg1 As StringDim errMsg2 As StringDim errMsg3 As StringerrMsg1 = Error( 5 )' Now, errMsg1 = "Invalid procedure call or argument".errMsg2 = Error( 11 )' Now, errMsg2 = "Division by zero".errMsg3 = Error()' Now, errMsg3 = "" (no run-time errors have yet occurred).Example 2The following example shows a simple VBA function that divides a supplied number by a excel vba error second supplied number.If the second supplied number is zero, a message box showing the corresponding error message is displayed.' Function to divide two numbers.Function performDiv( num1 As Double, num2 As Double )if num2 = 0 Then' Display the error message corresponding to error code 11 (represents division by zero).MsgBox ( Error( 11 ) )' Code to run if the divisor is zero.performDiv = CVErr( 11 )Else' Perform the division.performDiv = num1 / num2End IfEnd FunctionIn the above function, if the second supplied number is zero, the following message box is displayed:A useful list of VBA error codes and the corresponding error messages is provided on the Wiley Online Library website. Return to the VBA Functions PageReturn to the Excel VBA Tutorial Page Home Basic Excel Built-In Excel Functions ▾ List of All Excel Functions Text Functions Logical Functions Information Functions Date & Time Functions Lookup & Reference Functions Math Functions Statistical Functions Database Functions Financial Functions Engineering Functions Excel 2013 New Functions Excel Vlookup Tutorial Pivot Table Tutorial Excel Formulas Array Formulas Tips & Tricks Common Excel Errors Excel Templates Excel Macros Excel VBA Tutorial Built-In VBA Functions Excel 2003 vs 2007 Recommended Books Disclaimer Privacy Policy Copyright © 2008-2016 ExcelFunctions.net
the wrong time. The application may crash. A calculation may produce unexpected results, etc. You can predict some of these effects and take appropriate actions. Some other problems are not under your control. Fortunately, both Microsoft Excel and the VBA language provide various tools or means of dealing with errors. Practical Learning:Introducing Error Handling Open the Georgetown Dry Cleaning Services1 spreadsheet and click the Employees tab Click the Payroll tab Click the TimeSheet tab To save the workbook and prepare it for code, press F12 Specify the folder as (My) Documents In the Save As Type combo box, select Excel Macro-Enabled Workbook Click Save Introduction to Handling Errors To deal with errors in your code, the Visual Basic language provides various techniques. One way you can do this is to prepare your code for errors. When an error occurs, you would present a message to the user to make him/her aware of the issue (the error). To prepare a message, you create a section of code in the procedure where the error would occur. To start that section, you create a label. Here is an example: Private Sub cmdCalculate_Click() ThereWasBadCalculation: End Sub After (under) the label, you can specify your message. Most of the time, you formulate the message using a message box. Here is an example: Private Sub cmdCalculate_Click() ThereWasBadCalculation: MsgBox "There was a problem when performing the calculation" End Sub If you simply create a label and its message like this, its section would always execute: Private Sub cmdCalculate_Click() Dim HourlySalary As Double, WeeklyTime As Double Dim WeeklySalary As Double ' One of these two lines could produce an error, such as ' if the user types an invalid number HourlySalary = CDbl(txtHourlySalary) WeeklyTime = CDbl(txtWeeklyTime) ' If there was an error, the flow would jump to the label WeeklySalary = HourlySalary * WeeklyTime txtWeeklySalary = FormatNumber(WeeklySalary) ThereWasBadCalculation: MsgBox "There was a problem when performing the calculation" End Sub To avoid this, you should find a way to interrupt the flow of the program before the label section. One way you can do this is to add a line marked Exit Sub before the label. This would be done as follows: Private Sub cmdCalcu