Error Trapping
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Error Trapping Excel Vba
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Error Trapping Java
the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Error Trapping Office 2013 and later Other Versions Office 2010 Contribute to this content Use GitHub to suggest and submit changes. See our guidelines for contributing to VBA documentation. You can use the On Error GoTo error trapping definition statement to trap errors and direct procedure flow to the location of error-handling statements within a procedure. For example, the following statement directs the flow to the label line: Copy On Error GoTo ErrorHandler Be sure to give each error handler label in a procedure a unique name that will not conflict with any other element in the procedure, and make sure you append a colon to the name. Within the procedure, place the Exit Sub or Exit Function statement in front of the error handler label so that the procedure doesn't run the error-checking code if no error occurs. Copy Sub CausesAnError() ' Direct procedure flow. On Error GoTo ErrorHandler ' Raise division by zero error. Err.Raise 11 Exit Sub ErrorHandler: ' Display error information. MsgBox "Error number " & Err.Number & ": " & Err.Description ' Resume with statement following occurrence of error. Resume Next End Sub The Raise method of the Err object generates the specified error. The Number property of the Err object returns the number corresponding to t
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Error Trapping Excel
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Error Trapping In R
redirected in 1 second. Articles and Overviews Web Applications (ASP.NET) JSP Migration Articles JSP Migration Articles HTTP Error Trapping HTTP error trapping python Error Trapping HTTP Error Trapping ADO.NET for the Java Programmer ASP.NET Best Practices Authentication Configuration Cookies Deployment Directives Downloading and Uploading Files HTTP Error Trapping Java Servlets Multi-Browser Support Session Management Tag Libraries https://msdn.microsoft.com/en-us/library/office/ff192902.aspx Tracing and Debugging Validation ViewState and JavaBeans Web Services Integration XML Processing TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. HTTP Error Trapping Microsoft Corporation October 2003 Applies to Microsoft® ASP.NET Microsoft Visual Basic® .NET Java Server Pages Summary: Learn how error trapping works https://msdn.microsoft.com/en-us/library/aa478986.aspx in Java and ASP.NET, and how to convert error trapping routines using the Java Language Conversion assistant. (9 printed pages) Contents Introduction Errors in Java JCLA Conversion of Error Handling Error Trapping in ASP.NET Conclusion Introduction Most applications—Web-based or otherwise—use some kind of error trapping to handle both expected and unexpected errors. Error handling in Web applications occurs on four different levels, each of which generally traps different types of errors. Code-block level. Error handling done within a page in try-catch-finally blocks. Both JSP and Microsoft® ASP.NET support this structure. Page level. Errors that occur on a JSP or ASP.NET page (for example, compilation errors) are generally processed by specialized error pages. Redirection to error pages is accomplished through page directives. Application level. These errors apply to entire Web applications, and are generally handled and controlled by settings within configuration files, such as deployment descriptors in JSP applications or the web.config file in ASP.NET. Server level. This applies to all applications running on a server, and is generally configurable in the settings for the particular server. Error handling of this nature is vendor-specific. When an error occurs, it moves through these levels in a process called
of unanticipated errors, and in runtime applications if an unhandled error occurs the application will quit. Error handling will prevent that. Here are the basics: error trapping Private Sub Whatever() Dim db As DAO.Database 'These two lines are just an example Dim rs As DAO.Recordset 'your code may not include them On Error GoTo ErrorHandler error trapping excel 'Your code here ExitHandler: 'clean up as necessary and exit Set rs = Nothing 'These two lines are just an example Set db = Nothing 'your code may not include them Exit Sub ErrorHandler: Select Case Err 'specific Case statements for errors we can anticipate, the "Else" catches any others Case 2501 'Action OpenReport was cancelled. MsgBox "No data to display" DoCmd.Hourglass False Resume ExitHandler Case Else MsgBox Err.Description DoCmd.Hourglass False Resume ExitHandler End Select End Sub Home
map Error Trapping and Handling in Excel Macros Errors occur during the execution of a macro due to a variety of reasons including the use of incorrect code and the macro being executed under circumstances for which it was not intended. Including error trapping in all your macros allows you to determine what happens in the event of any error. You gain control of the error and are in a position to take appropriate action without your users getting wind of there being anything wrong. Failure to include error handling may result in unwelcome and confusing Excel behaviour. At the very least, your users might be dumped out of their spreadsheet and into your code in the Visual Basic Editor, facing for them some bewildering error messages from Excel. At worst you could be faced with loss of recent changes to a spreadsheet or with Excel freezing and refusing to function at all. Simple Error Handler There are a number of ways in which you might choose to include code for error handling in a macro. This is the skeleton code for a simple way: Sub your_macro_name() ' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On Error Goto ErrorHandler your macro code here ProcedureDone: Exit Sub ErrorHandler: MsgBox Err.Number & ": " & Error.Description Resume ProcedureDone End Sub The On Error statement turns on error trapping. Information about any error that occurs subsequent to line 3 is stored in a VBA error object named 'Err'. In the event of an error, the On Error Goto ErrorHandler statement instructs the macro to stop executing your code at the point at which the error occurs and to pick again at the ErrorHandler label, line 9. Line 10 sends a message box to the screen displaying information about the nature of the error: Err.Number is a unique identification number for the error object drawn from VBA's library of errors Error.Description is a description of that error. Line 11 instructs the macro to resume executing at the ProcedureDone label on line 6. Refined Error Handling Code Let's assume you have wrapped a new macro in the error-handling code described above. As you test your macro an error results. Therefore you are presented with the message box from which you learn the error number and the nature of the error. Now you are in a position to revise your error handler to respond to this specific error (in this example the error number 1234): Sub your_macro_name() ' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On Error Goto ErrorH