On Error Goto In Vb6
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x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Confused vba on error goto 0 about Error Handling in VB6 and the use of On Error GoTo up vote 3 down vote favorite 1 I'm needing to troubleshoot some old VB6 code and I'm confused about the use of "On Error". In the sample below, if I surround the specific line of code I want to test with the On Error GoTo and the ErrHandler1, is that the ONLY vba error handling best practices line that's tested. Or will the divide by Zero be included if it's in the same Sub? On Error GoTo ErrHandler1 If Not Exists(BaseDirectory + "\ARCHIVE") Then _ MkDir BaseDirectory + "\ARCHIVE" ErrHandler1: Call MsgBox(Err.Number & vbCrLf & Err.Description, vbExclamation, App.Title) intValue1 = 12 intValue2 = 0 intValue3 = intValue1 / intValue Thanks. vb6 error-handling share|improve this question asked Jan 27 '12 at 15:25 JimDel 2,05453369 add a comment| 3 Answers 3 active oldest votes up vote 8 down vote accepted The divide by zero will be included and handled, and it will probably create a loop in your sample... The correct approach is like that On Error GoTo ErrHandler1 If Not Exists(BaseDirectory + "\ARCHIVE") Then _ MkDir BaseDirectory + "\ARCHIVE" On Error Goto 0 'this will un-hook you error handler intValue1 = 12 intValue2 = 0 intValue3 = intValue1 / intValue 'this will be an un-managed error Exit Sub 'this make sure that msgbox is shown only when the error happens ErrHandler1: Call MsgBox(Err.Number & vbCrLf & Err.Description, vbExclamation, App.Title) share|improve this answer answered Jan 27 '12 at 15:48 Max 4,23511426 Thanks for the explanation! –JimDel
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 your applications. You can and should do all
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you can to prevent them, but when they happen you have to handle them. Introduction vba error number Trapping Errors at Run-Time Building Error Handlers Raising Your Own Errors Summary Introduction The various functions, statements, properties and methods available in Visual
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Basic and the components used in Visual Basic expect to deal with certain types of data and behavior in your applications. For example, the CDate() function can convert a value to a Date variable. The function is remarkably http://stackoverflow.com/questions/9035664/confused-about-error-handling-in-vb6-and-the-use-of-on-error-goto 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 of error may be a program logic error (you simply passed the wrong data) or it may be a data entry error on http://www.vb6.us/tutorials/error-handling 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 times want to generate them. This is often done in class modules built as components of ActiveX server DLLs or EXEs. It is considered good programming practice to separate the user interface from the program logic as much as possible, so if a server component cannot deal
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J2EEOther migration services Downloads Product Demos White Papers Videos/Audio Blogs About About ArtinSoft Our Technology Legacy Software MigrationBoard of Directors General FAQ JobsPress Room Mobilize.NET Customers Our CustomersCase Studies Partners Partner Program Commercial Deployment Certification ProgramOur Partners Contact Us Mobilize.NET ES Tweet Error Handling Transformation Visual Basic 6.0 and the .NET languages have different error handling techniques; while VB.NET is able to support a small subset of VB6 error handling keywords, C#.NET is not. Also, VB6 features in-code labels that can be used to create confusable “jump” patterns. These patterns are complex to read in VB6 and need to be removed from the resulting code for the sake of maintainability. The Visual Basic Upgrade Companion is able to remove unstructured “spaghetti code” and convert it to structured .NET statements. All unused labels are removed from the resulting code, plus the most commonly used “On Error” patterns are currently recognized and replaced for native .NET equivalent “try … catch” blocks. As part of the full conversion of the Visual Basic 6 Error handling schema (On Error ... Goto) to .NET, it is also necessary to convert the Err Object. The following VB6 extract shows a simple usage of the “On Error” statement to avoid a possible division by zero. The flow control of this source code extract will jump to the “ErrorHandler:” label in case there is an arithmetic error. Original VB6 source code Public Sub ErrorHandling(arg1 As Integer) On Error GoTo ErrorHandler Dim var1 As Integer var1 = 1 / arg1 MsgBox var1 MsgBox arg1 Exit Sub ErrorHandler: MsgBox Err.Description, , "Error" End Sub The Upgrade Wizard converts it using the same error management statements as in the original VB6 source code. VB.NET code generated by the Upgrade Wizard Public Sub ErrorHandling(ByRef arg1 As Short) On Error GoTo ErrorHandler Dim var1 As Short var1 = 1 / arg1 MsgBox(var1) MsgBox(arg1) Exit Sub ErrorHandler: MsgBox(Err.Description, , "Error") End Sub The Visual Basic Upgrade Companion is able to generate VB.NET source code using the .NET “Try Catch” blocks by applying special refactor techniques, as well as the same error management patterns from VB6 if needed. If the resulting language is C# the “try catch” generation is mandatory. VB.NET code generated by the Visual Basic Upgrade Companion Public Sub ErrorHandling(ByRef arg1 As Integer) Try Dim