try... Catch problem

Targets Web
1

I am developing a web app where select users can upload certain documents pertaining to an event, that general users can then download as required. I am having some difficulty with the code that will download the document. Specifically, when a document was manually removed, I have a try catch logic to skip the download. The problem is however that I don’t reach the Catch section, I have a unhandled exception (nilobject exception, which is what I was trying to catch) in the try section.

Usually, such issues result from my code being incorrect, but I don’t see what I could be doing wrong. So, here it is. What am I doing wrong?

The user selects a file name in a listbox. The file was previously saved in a folder that is specific to the environment. :

If Me.listindex > -1 Then
  
  Dim SavedFile As folderitem
  Dim UploadedFile As String
  UploadedFile = Me.cell(Me.listindex,0)

  SavedFile = App.ExecutableFile.Parent.Child("UploadedDocuments")  ' get to the uploaded documents folder
  SavedFile = SavedFile.child(Session.ZENV)                         ' Reach the environment subfolder
  Try
    SavedFile = SavedFile.Child(UploadedFile)                             ' the actual file to download   <---this is where the application fires the nilobjectexception 
  Catch err As RuntimeException
    If err IsA NilObjectException Then
      MsgBox ("Le fichier n'est pas disponible.")
      Return
    Else
      Return                                                        ' do nothing - early return  --- need to build logging here
    End If
  End Try

..... (method continues)

This is with 2017R3 on Windows 10 X64 (the app is compiled 32 bit)

Thanks in advance.

2

I think I may have found my answer in an older thread

the debugger would stop at the error before my code has a chance to handle it, so when running in the IDE I would have to use #Pragma BreakOnExceptions to let my code handle it. back to testing this.

3

of course… Worked on it for hours, and found the solution right after posting. Hopefully, it is going to be useful to someone else.