Run Sub before macro Ends like Finally block - vba

Question

Is there some VBA best practice to use something like 'before end' subroutines?
I am changing Excel's default configs when my macro starts, and before my macro reaches its 'end sub' line I am resetting the configs to its standards.
But what if some error occurs? Am I supposed to define 'On Error' treatment inside all subs to reset the configs to the standard properties?
Just for example, I am changing configs such as:
ScreenUpdating
DisplayStatusBar
Calculation
DisplayAlerts

Answer 1

I'm pretty sure there is no such mechanism that is called unconditionally before exiting a function or a subroutine. You may have though error handlers (but these are executed conditionally; see the comment of ckuhn203 for an example).
However, there is such a mechanism for instances of Class Modules (i.e. for objects). When an object is destroyed (this happens when is not referenced anymore by any variable/storage), its Class_Terminate subroutine is called no-matter-what. If you can wrap your task in such an object that you discard immediately after you create it, you could override overwrite this subroutine to do the cleanup.

Answer 2

If I understand your question correctly, yes, the best way is to define an On Error Goto line, in each method where it's needed, like this:
Public Sub DoSomething()
On Error GoTo Finally ' Try
Application.ScreenUpdating = False
' Do your stuff here
Finally:
Application.ScreenUpdating = True
End Sub
This will ensure the things like ScreenUpdating get done even if there is an error. You can also add a catch block, like this:
Public Sub DoSomething()
On Error GoTo Catch ' Try
Application.ScreenUpdating = False
' Do normal stuff here
GoTo Finally
Catch:
' Do only error stuff here
Finally:
Application.ScreenUpdating = True
End Sub
Generally speaking, GoTo is a hated practice, but for error catching, VBA kind of forces your hand.