How do we parse through the members of a Control Array?

General
1

Opened a new thread on this since it’s not specific to Web use.

In trying to debug the cause of the NOE when accessing my Control Arrays, I simply tried to loop through the Text values of the members. As soon as I tried to access array member 1, I get an NOE. I then tried to get the Ubound for the Control Array to only step through the existing members but Ubound is not an option …

I know I’ve been living in Visual Studio and XCode for the last 4 months, but, no Ubound on a Control Array?

2

Hi Tim,

Yes, you don’t have a ubound for Control Sets. You need to keep a count of members yourself when you add or remove them. I don’t know about your NOE, but check it’s of the type you want with ISA and then if it is, cast accordingly.

Regards - Richard.

3

Thanks, Richard, but the reason that I was trying the Ubound trick was because my array of 5 controls (0-4) is throwing an NOE as soon as I stepped from 0 to 1. Basically:

For x = 0 To 4
    MemCheck = MemCheck + Val(pmCount(x).Text)
Next

Accessing 0 is good, but as soon as x becomes 1, poof - NOE.

4

I seem to recall that control arrays don’t necessarily go in order with no holes. Xojo renamed them to Control Sets to help mitigate this confusion https://documentation.xojo.com/topics/user_interface/desktop/desktop_controls/control_sets.html

If I were implementing this, I would use ContainerControl and manage my own array. You may find more luck with this method.

5

It turns out that if the members of the control set (thanks, Tim) aren’t visible, they don’t exist. If I keep track of how many rows are visible, the logic works …

6

Usually, the way to replace the missing UBound function was to use a code like this:

var i as integer
do
try
var cnt as MyControlArray=MyControlArray(i)
catch
return i
end try
i=i+1
loop

(sorry for possible bugs, I don’t remember well; it was months/years ago that I needed this)
This is no longer doable in Xojo because the order/hole-free is not guaranteed anymore?

7

This will fail on Control Sets with holes in them. According to Tim, making a control invisible creates a hole. Removing an item also leaves a hole. Control Sets are not arrays and that is covered in the documentation I linked.

8

So it changed, because that was doable 5 or 10 years ago.

What’s the proper way to get all items of a controls set now? Keep a property array to the window and add/remove items along the real control?