Error Handling In Vba Class
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Error Handling In Vba Excel
up vote 4 down vote favorite I have several Class Modules in my Workbook. One of public functions in Class Module 1 relies on data from a function in Class Module 2, this happens four times. In the event that the object is missing from Class 2 the program crashes (as expected). I am having difficulty debugging the code properly as it seems that I can only error handling in vba macro exit the program from the main subroutine. I would prefer to kill the program from the Class function, but I don't know if that is possible (we can squash this here if it is). I am currently using On Error statements in the main subroutine, but these don't execute in a timely manner because the function in Class 1 gets data from Class 2 four times. Class Module 1 Function Function oload(ByVal pload As Double, ByVal cord As cCordCol, ByVal grid As cGridCol) ' cord is a scripting.dictionary of Class Module Objects (cCord) ' grid is a scripting.dictionary of Class Module Objects (cGrid) n1 = grid.Item(pg1).toGlobal(cord) n2 = grid.Item(pg2).toGlobal(cord) n3 = grid.Item(pg3).toGlobal(cord) n4 = grid.Item(pg4).toGlobal(cord) ' do something here oload = sum_Ploads End Function Above the n1 thru n4 is where I am calling on the public function of Class Module 2. Below is the Class Module 2 Function Function toGlobal(ByVal cord As cCordCol) On Error Resume Next ctype = cord.Item(Me.cord1).sys ' Missing Coordinate System Error If Err.Number <> 0 Then i = MsgBox("The definition of Coordinate " & Me.cord1 & " was missing from the Bulk Data " & Chr(10) & _ "File. Include this Coord in
Kusleika in Classes, Events on January 2, 2014. A while ago I read an answer on stackoverflow about error handling. I can't seem to find that question now, so you'll have to take my word for it. The question was asking about error handling best practices in VBA and I found one of the answers interesting. The
Vba Error Handling Best Practices
answerer said that you could use the Terminate event of a custom class module as your error vba error handling exit sub logger. I had never thought of that. I've been using the Professional Excel Development error handling method with great success for many years. This method if error vba controls the error as it moves back up the call stack, either by returning a Boolean to the calling procedure or by rethrowing the error. Without error handling, VBA sends the error back up the call stack automatically until it is http://stackoverflow.com/questions/27828316/error-handling-in-a-class-module-function handled. So, for instance, if you only handled errors in your entry point procedures, you would still have an error handler. You just wouldn't have the information about the stack that would be critical to finding out where the error occurred. The class method of error handling takes advantage of the built-in ability of VBA to pull an error back up the stack. It uses the fact that local variables go out of scope when the procedure is complete, such as when an http://dailydoseofexcel.com/archives/2014/01/02/error-handling-via-an-error-class/ unhandled error occurs and the cursor is sent to the calling procedure. If you had a local variable pointing to a class, that class' Terminate event would fire when an unhandled error occurred. Borrowing the setup from PED2, let's see how this would work. Sub EntryPoint() Dim clsError As CError On Error GoTo ErrorHandler Set clsError = New CError: clsError.SetLoc "Module1", "EntryPoint" SubProc1 ErrorExit: Exit Sub ErrorHandler: If gbDebugMode Then Stop: Resume Else Set clsError = Nothing MsgBox Err.Description Resume ErrorExit End If End Sub Sub SubProc1() Dim clsError As CError Set clsError = New CError: clsError.SetLoc "Module1", "SubProc1" SubProc2 End Sub Sub SubProc2() Dim clsError As CError Set clsError = New CError: clsError.SetLoc "Module1", "SubProc2" Debug.Print 1 / 0 End Sub EntryPoint calls SubProc1. SubProc1 calls SubProc2. An error occurs in SubProc2. Only EntryPoint has error handling. It uses On Error Goto ErrorHandler to route program flow to the error handling section. Neither SubProc1 nor SubProc2 have any error handling. We're going to
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Break In Class Module setting in your VBA Code. Error Handling When you are testing and running your code, you have three error trapping modes. The first is Break On All Errors. This will cause the debugger to open if any error occurs, regardless of any On Error handling you might have in the code. The second option is Break On Unhandled Errors. This will cause the debugger to open if the error is not handled by an existing On Error directive. This is the most often used option and is the default setting. The third option, Break In Class Module is the most important and least used. It is not the default error trapping mode, so you have to set it manually. The Break In Class Module is the most important because it will cause the debugger to break on the line of code within an object module that is actually causing the problem. The Break In Class Module setting is in the Options dialog accessible on the Tools menu. It is on the General tab of the Options dialog, as shown below. For our discussion, we will look at a UserForm as the object module. Other object modules include Class modules, the ThisWorkbook module, and the Sheet modules. A regular code module is not an object module. If you have your error trapping set to Break On Unhandled Errors and an error occurs within the form's Initialize method or any method called by Initialize, the debugger will take you to the line of code that created the object. This creation takes place when you use the Load statement to load a form into memory, or when you call Show to make the userform visible. (The Show method will Load the form if it is not already in memory.) For example, UserForm1.Show Clearly, there is nothing wrong with this statement. The error is inside the userform's code, not in the Show method. If error trapping is set to Break On Unhandled Errors, the debugger will show this line of code as the source of the error. You could spend a lot of time trying variations of the code to get it to work, but you would continue to get an error. The Break In Class Module tells the debugger to go inside the object module and flag the line of code that is actually causing the error. For example, suppose your userform has an Initialize event like the following: Private Sub UserForm_Initialize() ' Force an error for illustration. Debug.Print 1 / 0 End Sub If Break In Class Module setting in effect, the debugger would take you to the Debug.Print statement within the userform's object module, as the cause of the error. If the setting is something else, the debugger would take you to the line where the form is displayed with the Show method, masking the true cause of the