Home > Vb6 Error > Vb6 Error Checking

Vb6 Error Checking

If you must terminate an application due to some disastrous situation, be sure to provide as much information to the user as you can so that the situation can be resolved. Posts 6,600 Re: The best error handling for VB6 Originally Posted by isnoend07 I also have a custom ocx that silently emails me any errors thru an online jmail if my On Error GoTo ErrHandler: Worksheets("NewSheet").Activate Exit Sub ErrHandler: If Err.Number = 9 Then ' sheet does not exist, so create it Worksheets.Add.Name = "NewSheet" Tue, 08/16/2011 - 00:05 — Anonymous (not verified) hmmm.....tell me if ur hmmm.....tell me if ur application run...it has been two years..

The following example shows how these features can be used with the existing exception handling support: VB Copy On Error GoTo Handler Throw New DivideByZeroException() Handler: If (TypeOf Err.GetException() Is DivideByZeroException) I'm about half a decade late to the game of VB6. It might also be illegal in some countries. If Err.Number = vbErrFileNotFound Then ' It's a file not found error.

For backward compatibility, VB continues to support the Err and Error statements and functions. Number You can raise any of the standard VB error numbers or provide your own number. Integer function which takes every value infinitely often How much more than my mortgage should I charge for rent? start_date = CDate(date_string) ' Do something with the date. : ' Do not pass through into the error handler code.

My 21 yr old adult son hates me Which is the most acceptable numeral for 1980 to 1989? Trapping Errors at Run-Time Before you can do anything to deal with a run-time error, you need to capture the error. Crowder. For example, the following code tries to load a file that might be stored on a floppy disk.

Control passes to Error1 if Subroutine1 ran correctly, but it passes to Error2 if Subroutine1 also generated an error. start_date = Date Resume Next End Sub Note that this is probably not the best way to handle this situation because it silently handles the error instead of making it obvious. Anyhow, it is good practice to only allow one exit point for any function. Is there any way to get the stacktrace or location of error?

Execution of all Visual Basic code begins with either an event handler or the Main subroutine. dlgOpenFile.CancelError = True ' Ignore errors for now. Sending a stranger's CV to HR Treasure hunt of the century What are the implications of the curse of dimensionality for ordinary least squares linear regression? You should include the module' name as well; one simple idea is to define a private' constant in all modules that contains the module name,' and then add the function name

This statement tests the value of Err.Number and assigns some other number to N. If the data provided is not a date, an error is raised using the constant from the error enumeration in the declarations section of the class module and a description that If the program encounters an error, it passes control to the error handler beginning at the indicated line number or label. but some time Err.Description gives me blank value. –Royson Jan 19 '10 at 7:33 Err.Description can be blank (try this Err.Raise 1234567 to see that happen), Err.Number should always

Always ask for user's confirmation before sending any unexpected email from your application. Trick or Treat polyglot Generate a one-path maze How do really talented people in academia think about people who are less capable than them? Most event procedures are also fired by Visual Basic when no other code is running so these are also at the top of the tree. Click the Resume Next button.

You can code your classes to map any error the class encounters to class-defined error numbers, but given the large number of potential errors that could occur in an application, that If desired, test conditions that would cause errors. Here is a complete example:'Public Function GetEmployeeName() As String'On Error GoTo GetEmployeeNameErr' ErrorHandler eaEnter, ModuleConstant & ".GetEmployeeName"' ' Your code to access data/create objects goes here' ErrorHandler eaExit''GetEmployeeNameExit:' Summary Handling run-time errors is something all applications must do if they are to be robust and reliable.

I attached a simple test project (bas only; just double-click to open it and then Run it) as proof of concept. 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 Tell the user and leave.

Pradeep, Microsoft MVP (Visual Basic) Please appreciate posts that have helped you by clicking icon on the left of the post. "A problem well stated is a problem half solved."

You must also deal with the error in some way, even if the error handling code is as simple as ignoring the error (a perfectly valid approach in some situations) or The values you provide for these parameters are available to error handling code that deals with the error you generate. Visual Basic Language Reference Statements F-P Statements F-P Statements On Error Statement On Error Statement On Error Statement For Each...Next Statement For...Next Statement Function Statement Get Statement GoTo Statement If...Then...Else Statement Not surprisingly, the parameters of the Raise method are the same as the properties of the Err object: Number, Description, Source, HelpContext, and HelpFile.

But simple vb6 developers will face problem to follow this. The specified line must be in the same procedure as the On Error statement, or a compile-time error will occur.GoTo 0Disables enabled error handler in the current procedure and resets it It should stop during design mode or raise an error in the final compiled version so someone can fix the problem. Unlike the Class_Terminate event, the Class_Initialize event of a class module can raise an error or allow it to go untrapped.

Or will the divide by Zero be included if it's in the same Sub?