Error With No Error Handler
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Express Throw Error
Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like express router error handling you, helping each other. Join them; it only takes a minute: Sign up Error handling VBA : when no errors? up vote 2 down vote favorite I'm trying to catch some errors with VBA, i found this
Express Error Object
tutorial and i wanted to catch the errors using the GoTo method like in the following example : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' myHandler: MsgBox "EROOR !" End Sub The problem is that even if there is no error, the myHandler section is always executed ! I found this discussion but the proposed answer doesn't solve the problem ! I tried to add an Exit Sub statement as express error handling best practices explained : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") Exit Sub ' ' Some Code ' myHandler: MsgBox "EROOR !" End Sub In that case it exits the method even without error. I also tried : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' myHandler: MsgBox "EROOR !" Exit Sub End Sub But still the same problem, the myHandler is executed even without errors ! Can anyone help please ? excel vba error-handling share|improve this question asked Apr 13 '12 at 12:58 Mehdi 72241333 add a comment| 4 Answers 4 active oldest votes up vote 8 down vote accepted Just put Exit sub in. Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' Exit sub myHandler: MsgBox "EROOR !" err.clear End Sub share|improve this answer answered Apr 13 '12 at 13:01 Fionnuala 77.1k665110 1 Can you add the line On Error Goto 0? So OP understands that it's a good practice resetting error redirects... Upvoted :) –Marco Apr 13 '12 at 13:02 @Marco Do you mean err.Clear? This is VBA. –Fionnuala Apr 13 '12 at 13:05 1 @Remou: maybe I'm wrong, but I remember I used (many years ago) On Error Goto 0 to make code behave without error checking. And I remember it was a good practice to use this instruction to
a long time now, I've been brute-force ugly with my error handling in my ExpressJS apps. Basically, just throw the exception after it bubbles back up to the route handler. This
Express Error Handling Example
works. If you don't mind the app completely blowing chunks at this
Express Error Handler Not Called
point and dumping itself entirely. Of course, you could put a global error handler in your code to node js error handling catch this unhandled exception, and *not* exit the app. But this is probably a bad idea, too. Once an exception is thrown (and not handled by the code that was http://stackoverflow.com/questions/10141292/error-handling-vba-when-no-errors being called, in the first place), the NodeJS environment is basically in an unknown and potentially bad state. Handle It Properly Unhandled exceptions should not be allowed to crash and exit the app. Therefore, you really want to handle this exception in your callback, properly. It's a simple change, but using "return next(err);" instead of "throw err;" allows asynchronous code to https://derickbailey.com/2014/09/06/proper-error-handling-in-expressjs-route-handlers/ raise an exception and still have it caught by the error handling pipeline in your app. Instead of putting the app into an unknown state where everything is potential dead or dangerous, calling "next(err)" tells the Express and Connect frameworks to pass the error along until an error handling middleware of function can properly take care of it. Error Handler Middleware If you weren't aware of it, every ExpressJS app comes with an error handler (or two - one for development work, one for non-development work… "production" … by default) in the default app.js file that is generated by the express command line: This code properly handles an error that was sent up the line using the "return next(err);" style of handling. Instead of putting the app in to an exception state by throwing the error, it is properly handled by the middleware, allowing you to write your own custom code, error logging and rendered view in response to the error ocurring. More On Error Handling There are potentially a lot more advantages to doing things this way, ce
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