Unexpected OutOFBounds Exception

General
1

The code below works fine, but a folder is skipped:

// Combien d’items dans le dossier Master_FI ?
Master_Cnt = Master_FI.Count - 1

// Récupère la liste des dossiers scan
For Loop_Idx = 1 To Master_Cnt

This code leads to an OutOfBoundsException:

// Combien d’items dans le dossier Master_FI ?
Master_Cnt = Master_FI.Count

// Récupère la liste des dossiers scan
For Loop_Idx = 1 To Master_Cnt

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image526×438 41.3 KB

The following lines add “valid” folders to a DesktopListBox.

I followed my result in the DesktopListBox and discovers a folder was not reported (I read 118 lines in the DesktopListBox).

Before answering, look at the loop indice start value: 1 in both cases.
There are 119 items in the scanned folder, some are excluded (invisibles and ending with " - Data" a Folder named “Graphics” is excluded too).
The case of the Icon + CR is excluded, I placed all my target items in a brand new folder (and so without custom icon).

I am out of ideas (except blaming Tahoe…)

Mac Tahoe 26.1 / Xojo 2025r3.

2

Yup, because it’s an index. You should be doing 0 to count-1.

1 Like
3

If it’s an array it would run from 0 to count - 1. For example if count is 10 it would run from 0 to 9, which is 10 items. Accessing element 10 would result in an out of bounds error as you’ve seen.

4

It would be faster if you did this anyway

For each file as folderitem in Master_FI.children

1 Like
5

I do not used an array…

6

But most methods in Xojo API2 are 0 based also.

7

You are correct:
For Loop_Idx = 0 To Master_Cnt - 1

Works.

So FolderItem(0) = an item from the folder (a difference with API1 where I never used index 0 - it was probably returning the reference of .Parent folder: not what I wanted).

This hurt my eye, but if this is faster, I will try it after a drink.

In my test I even get:

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image1605×1670 156 KB

my data folder was a child (folder) of Downloads
Xojo Applications is the folder where Xojo creates the Debug applications instead of beside the project file).

Thank you for your answers.