On Error Repeat Vba
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Tweet Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Jun 2nd, 2010,04:32 vba on error exit sub AM #1 Dr.Gues View Profile View Forum Posts Thread Starter New Member Join Date Feb 2010 Posts 6 [RESOLVED] on error repeat command Hey Guys! I'm writing a program where I communicate over a GPIB card with a device. Sometimes the on error goto line commands I send to the device fail. Until now my program stops working and an error message appears. Now I want to change the program, so that it repeats to send the command until it doesn't not fail anymore. My code looks like this: Code: Call ibtmo(Sourcemeter, 16) 'thats for example a command I send If (ibsta And EERR) Then ' if this fails GPIBCleanup is called Call GPIBCleanup("Unable to set timeout of Sourcemeter") End If Public Sub GPIBCleanup(msg$) ' After each GPIB
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call, the application checks whether the call succeeded. ' If an NI-488.2 call fails, the GPIB driver sets the corresponding bit in ' the global status variable. If the call failed, this procedure prints an ' error message. ErrorMnemonic = Array("EDVR", "ECIC", "ENOL", "EADR", "EARG", _ "ESAC", "EABO", "ENEB", "EDMA", "", _ "EOIP", "ECAP", "EFSO", "", "EBUS", _ "ESTB", "ESRQ", "", "", "", "ETAB", _ "ELCK", "EARM", "EHDL", "", "", "", "EWIP", "ERST", "EPWR") ErrMsg$ = msg$ & Chr(13) & "ibsta = &H" & Hex(ibsta) & Chr(13) _ & "iberr = " & iberr & " <" & ErrorMnemonic(iberr) & ">" MsgBox ErrMsg$, vbCritical, "Error" Unload Me End Sub Can I do this by inserting a RESUME instead of the error message? Code: Call ibtmo(Sourcemeter, 16) If (ibsta And EERR) Then RESUME End If or will this only repeat the if statement. Or do I have to use something like an On Error GoTo... thanks Philip Reply With Quote Jun 2nd, 2010,06:35 AM #2 westconn1 View Profile View Forum Posts PowerPoster Join Date Dec 2004 Posts 21,961 Re: on error repeat command you can use error handling like vb Code: sub mysub()on error goto errh'your codeexit suberrh:'you can use condition processing in case some other error occursresumeend sub i do my best to test code works before i post it, but sometimes am unable to do so for some reason, and usually say so if this is the case. Note code snippets posted are just
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other. Join them; it only takes a minute: Sign up vba error handling in loop up vote 9 down vote favorite new to vba, trying an 'on error goto' but, i keep getting errors 'index out of range' http://www.vbforums.com/showthread.php?616895-RESOLVED-on-error-repeat-command i just want to make a combo box that is populated by the names of worksheets which contain a querytable For Each oSheet In ActiveWorkbook.Sheets On Error GoTo NextSheet: Set qry = oSheet.ListObjects(1).QueryTable oCmbBox.AddItem oSheet.Name NextSheet: Next oSheet I'm not sure whether the problem is related to nesting the On Error GoTo inside a loop, or how to avoid using the loop vba error-handling share|improve this question asked Oct 4 '11 at 19:51 justin cress 5331921 add a http://stackoverflow.com/questions/7653287/vba-error-handling-in-loop comment| 9 Answers 9 active oldest votes up vote 11 down vote accepted The problem is probably that you haven't resumed from the first error. You can't throw an error from within an error handler. You should add in a resume statement, something like the following, so VBA no longer thinks you are inside the error handler: For Each oSheet In ActiveWorkbook.Sheets On Error GoTo NextSheet: Set qry = oSheet.ListObjects(1).QueryTable oCmbBox.AddItem oSheet.Name NextSheet: Resume NextSheet2 NextSheet2: Next oSheet share|improve this answer answered Apr 27 '12 at 19:07 Gavin Smith 1,690616 add a comment| up vote 7 down vote As a general way to handle error in a loop like your sample code, I would rather use: on error resume next for each... 'do something that might raise an error, then if err.number <> 0 then ... end if next .... share|improve this answer answered Oct 4 '11 at 20:28 iDevlop 14.4k44187 add a comment| up vote 3 down vote How about: For Each oSheet In ActiveWorkbook.Sheets If oSheet.ListObjects.Count > 0 Then oCmbBox.AddItem oSheet.Name End If Next oSheet share|improve this answer edited Oct 4 '11 at 20:01 answered Oct 4 '11 at 19:56 Joe 82.7k21118233 aren't there 'list objects' that aren't query tables? I need the sheet to have a query table. –justin cress Oct 4 '11 at 20:19 @Justin, if so, add a test for ListObject
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 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 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 http://www.excel-easy.com/vba/examples/error-handling.html 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 on error 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 vba error handling 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 allowable range; and so on. If you dont implement error handling in your macro, on encountering a run-time error your c
execution at a specified line upon hitting an error. Situation: Both programs calculate the square root of numbers. Square Root 1 Add the following code lines to the 'Square Root 1' command button. 1. First, we declare two Range objects. We call the Range objects rng and cell. Dim rng As Range, cell As Range 2. We initialize the Range object rng with the selected range. Set rng = Selection 3. We want to calculate the square root of each cell in a randomly selected range (this range can be of any size). In Excel VBA, you can use the For Each Next loop for this. Add the following code lines: For Each cell In rng Next cell Note: rng and cell are randomly chosen here, you can use any names. Remember to refer to these names in the rest of your code. 4. Add the following code line to the loop. On Error Resume Next 5. Next, we calculate the square root of a value. In Excel VBA, we can use the Sqr function for this. Add the following code line to the loop. cell.Value = Sqr(cell.Value) 6. Exit the Visual Basic Editor and test the program. Result: Conclusion: Excel VBA has ignored cells containing invalid values such as negative numbers and text. Without using the 'On Error Resume Next' statement you would get two errors. Be careful to only use the 'On Error Resume Next' statement when you are sure ignoring errors is OK. Square Root 2 Add the following code lines to the 'Square Root 2' command button. 1. The same program as Square Root 1 but replace 'On Error Resume Next' with: On Error GoTo InvalidValue: Note: InvalidValue is randomly chosen here, you can use any name. Remember to refer to this name in the rest of your code. 2. Outside the For Each Next loop, first add the following code line: Exit Sub Without this line, the rest of the code (error code) will be executed, even if there is no error! 3. Excel VBA continues execution at the line starting with 'InvalidValue:' upon hitting an error (don't forget the colon). Add the following code line: InvalidValue: 4. We keep our error code simple for now. We display a MsgBox with some text and the address of the cell where the error occurred. MsgBox "can't calculate square root at cell " & cell.Address 5. Add the following line to instruct Excel VBA to resume execution after executing the error code. Resume Next 6. Exit the Visual Basic Editor and test the program. Result: Do you like this free website? Please share this page on Google+ 3/6 Completed! Learn more about macro errors >Go to Top: Error Handling|Go to Next Chapter: String Manipulation Chapter<> Macro Errors Learn more, it's easy Debugging Error Handl