Program To Demonstrate Nested On Error Statement In Vb
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On Error Goto Vba
checking, but it does not. The code is psuedo as below. However, whenever an error occurs within an error (For instance, an error is tripped in the loop, goto SmallError occurs, and an error occurs in SmallError) The second GoTo is not used. The error then breaks the code. Ex: Error in Loop GoTo SmallError Error in SmallError Code Breaks (Here code should GoTo FatalError) Sub DoThings() On Error GoTo SmallError 'Coding Happens Do on error goto line While(conditionhere) 'Looping things happen GoTo LoopResume SmallError: source = Err.source descript = Err.Description On Error GoTo Fatal Error 'Small error processing happens Resume LoopResume FatalError: source = Err.source descript = Err. Description On Error GoTo ExitError 'Fatal Error processing happens ExitError: Exit Sub LoopResume: count = count + 1 Loop On Error GoTo FatalError 'Finishing code happens End Sub excel vba error-handling nested goto share|improve this question asked Apr 4 '13 at 12:50 steventnorris 1,9701147104 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted You can't use an On Error statement within an error handler. See e.g. this article that explains this. What you CAN do however is to have a separate routine that handles the "regular error". This routine can have a "fatal error" handler. Your code would then look something like this: (Edit: Edited the code to enable exit when there is a fatal error): Sub DoThings() On Error GoTo SmallError Dim fatalExit As Boolean 'Coding Happens Do While(conditionhere) 'Looping things happen LoopResume: count = count + 1 Loop On Error Goto SmallError2 'Finishing code happens Exit Sub SmallError: handleError Err.Source, Err.Description, fatalExit If fatalExit Then Exit Sub Else Resume LoopResume End If SmallError2: handleError Err.Source, Err.Description, fatalExit Exit Sub End Sub Private Sub handleError(ByVal source As String,ByVal description As String, ByRef
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Database Guide User login Username: * Password: * Request new password Home › Tutorials Error Handling In Visual Basic Level: Despite your best efforts to cover all possible contingencies, run-time errors will occur in http://www.vb6.us/tutorials/error-handling your applications. You can and should do all you can to prevent them, but when they happen you have to handle them. Introduction Trapping Errors at Run-Time Building Error Handlers Raising Your Own Errors Summary Introduction The various functions, statements, properties and methods available in Visual Basic and the components used in Visual Basic expect to deal with certain types of data and behavior in your applications. For on error example, the CDate() function can convert a value to a Date variable. The function is remarkably flexible in the type of information it can accept, but it expects to receive data that it can use to derive a date. If you provide input that it can't convert, it raises error number 13 - "Type mismatch" - essentially saying "I can't handle this input data." In an application, this type on error goto of error may be a program logic error (you simply passed the wrong data) or it may be a data entry error on the part of the user (you asked for a date and the user typed a name). In the first case, you need to debug the program to fix the mistake. However, there is no way for you to anticipate the behavior of the end users of the application. If the user enters data you can't handle, you need to deal with the situation. Dealing with errors at run-time is a two step process: Trap the Error Before you can deal with an error, you need to know about it. You use VB's On Error statement to setup an error trap. Handle the Error Code in your error handler may correct an error, ignore it, inform the user of the problem, or deal with it in some other way. You can examine the properties of the Err object to determine the nature of the error. Once the error has been dealt with, you use the Resume statement to return control to the regular flow of the code in the application. In addition to dealing with run-time errors, you may at ti