Mid() will see the BOM and if you specify a starting point will start at the BOM, but Len() ignores the BOM. In other cases, text handling functions give wrong answers, e.g. When you run some procedure that works with the data, strange errors can occur and it may look like your file has become corrupt. utf-8 with a byte order mark (BoM) is particularly nasty. utf-8 can get into your data if data was originally loaded from a text file. utf-8 unicode can sometimes play havoc with ms-access as it seems to be allow data to be confused for instruction codes (my guess).
Excel vba on error not working code#
The have() has been called hundreds of millions of times in my code but this is the only instance that causes it to fail and the error handler is not involked. The have() function is not directly called by my code, but somehow seems to be triggered by the me.requery method. The form is a continuous form, so records and fields are not visible when the form is loaded with an empty recordset. In this case, the form that called the code returned had its recordsource set on the fly to an empty recordset, hence the fields on the screen are not visible. The code sometimes fails on the line flagged with **. 'Errors sometimes occur if an unbound control is referenced **ElseIf Len(Trim(item)) = 0 Then 'Faster than Item ""**
Excel vba on error not working validation code#
Simplifies handling nulls and empty strings in validation code Public Function Have(ByVal item As Variant) As Boolean But it might be quite difficult to come up with tests that will produce all the possible errors you want to ignore. I would much prefer the first, as I'm a firm believer in only ignoring known errors, not any old error that happens. Something like this: Public Sub MySub()ĭim bolErrorInCodeBlockToIgnore As Boolean If you don't want to figure out what the limited number of errors you want to ignore happen to be, I would suggest that you set a flag at the beginning of the code block that produces the errors you want to ignore, then use an `If bolErrorInCodeBlockToIgnore Then to decide if you're ignoring all errors or not. You don't want to ignore every single error because you might end up ignoring important errors elsewhere in your subroutine. In my code framework above, I listed the error numbers as X, Y, Z, but you'd replace that with the real error numbers you want to ignore, instead. In this code, you use a SELECT CASE in your error handler to decide which errors you want to ignore. MsgBox Err.Number & ": " & Err.Description, vbExclamation, _ ' do whatever it is you need to do in order to record the offending rowĬall RecordError(rs!PK, Err.Number) ' PK is a field that identifies the bad record Set rs = CurrentDB.OpenRecords()Ĭase X, Y, Z ' where these are error numbers you want to ignore Say your code is something like this (a skeletal framework): Public Sub MySub() Nobody has really answered your question. Note that David Heffernan gave you the essential part of this in his answer, and it was here before mine.
If you want to temporarily change the manner of error handling within a routine, put the "new" one right before the code to which it is to apply, and (if used), the "revert" (reissuing the original), right after.Įven given all that, I have no idea why it would break on the error-throwing line when "Break on Unhandled Errors" is selected, unless you've managed to confuse it so much that it thinks there's no active error handling (and I'd be surprised if it compiled if that were the case). statement immediately followng the routine's declaration (the Sub or Function statement), though some people put their Dim statements in between. Given this, it's usual to place the On Error.
On Error GoTo 0: turns off error handling.This is way too much work for most situations. Alternatively, this form can also be used if you check the Err object immediately after any potentially error-throwing line (if Err.Number is zero (0), the statement succeeded without throwing an error). Sometimes useful at the end of routines for cleanup (for instance, if you want to Close a Recordset that may or may not be open). On Error Resume Next: ignores the error & continues.Hardly ever used, since it's potentially infinite. On Error Resume: immediately retries the error-throwing statement.On Error GoTo : must be defined in the same routine, by writing the label name immediately followed by a colon (:) on a line by itself.it remains in force for the rest of the routine, unless superceded by a new On Error. statement only applies to the routine (Sub or Function) in which it appears (though it will also catch errors that "bubble up" from routines that are called from within the routine in which you use it). I think you're not understanding how VB(A) error handling works.