Try...Catch problems

Getting Started
1

Alright, it’s time to ask the question; What’s wrong with this code?

try
While Not checkFile.EOF
itemsArray.Append(checkFile.ReadLine)
Catch e as OutOfBoundsException
MsgBox(“Exceeded size of Array.”)
Wend
End Try

I’m following the example in the Docs (hopefully), but it’s throwing two errors:

Syntax error
Catch e as OutOfBoundsException

Syntax error
Wend

Thanks!

2

Put the While and Wend outside of the Try/EndTry.

3

That was it. Funny thing is though, in the Docs, all the code is inside the Try/End Try

Try
Dim d As Xojo.Core.Date
Dim t As Text = d.ToText
Catch e As RuntimeException
If e IsA NilObjectException Then
’ your code
Else
’ Re-raise the exception for the framework
Raise e
End If
End Try

Try
Dim a(5) As Integer
a(6) = 45 ’ Raises an OutOfBoundsException
Catch e As OutOfBoundsException
’ The above exception is caught here for you to handle
ErrorLabel.Text = “Exceeded size of array”
End Try

Thanks, Greg!
regards,
-Rob

4

You might want to look at using Do/Loop rather than While/Wend http://developer.xojo.com/do-loop which allows you to test at the beginning (and end) of the loop.

Do Until CheckFile.EOF itemsArray.Append(checkFile.ReadLine) Loop

5

You should not “catching” external errors INSIDE the loop.

Move the test to where it belongs. Try something like:

While Not checkFile.EOF
  Try
     itemsArray.Append(checkFile.ReadLine) // Exploded?
  Catch e as OutOfBoundsException // let's take care of it and read another one
     MsgBox("Exceeded size of Array.")
  End
Wend

Another way could be catching outside (you “try” the entire loop):

Try
  While Not checkFile.EOF
     itemsArray.Append(checkFile.ReadLine) // Exploded?
  Wend
Catch e as OutOfBoundsException // let's take care of it and finish/give up the loop
    MsgBox("Exceeded size of Array.")
End
6