Question

The following code is causing random Run-Time Error '35600' Index out of bounds Ok

Asked by: dimante

       

    Dim keepplace As Integer

        keepplace = lv.SelectedItem.Index
   
        PopList

    lv.ListItems(keepplace).Selected = True

This is the code that I use to at a 5 minute interval refresh the items in a listview control.  I cannot reproduce the problem but I have complaints that it is happening.  Anyone ever run into this problem?

I am unsure as to why an error like that would ever come up.  The list is never empty.

Thanks in advance!
-D-

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Asked On
2006-08-19 at 13:09:48ID21960373
Tags

35600

,

error

,

out

Topic

Visual Basic Programming

Participating Experts
3
Points
500
Comments
15

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Answers

 

by: angelIIIPosted on 2006-08-19 at 13:17:40ID: 17349009

>        keepplace = lv.SelectedItem.Index
first ensure/check if you HAVE a selected item:

if lv.SelectedItem is nothing then
  'no selected item
  keepplace = 0
else
  keepplace = lv.SelectedItem.Index
end if



and to ensure the following line does not error out:
on error resume next
    lv.ListItems(keepplace).Selected = True

or, if you can be sure the the item (keepplace) is not removed from the list:

if keepplace <> 0 then
    lv.ListItems(keepplace).Selected = True
end if

 

by: dimantePosted on 2006-08-19 at 13:58:02ID: 17349125

Good call.  I will put these changes in place and let you know in a couple days 8)

 

by: ShauliPosted on 2006-08-19 at 16:52:41ID: 17349611

This error will occurs if keepplace is = to 0. That is because listitems cannot begin with a 0. It always begins with 1.
Check to see if keepplace is equal to 0 and trap it if it is.

S

 

by: dimantePosted on 2006-08-19 at 17:26:18ID: 17349681

or just make it equal to 1 no?

 

by: ShauliPosted on 2006-08-19 at 18:30:40ID: 17349773

No. What you need to do is to check the value of keepplace and trap it if it is = to 0

If keepplace > 0 then
      lv.ListItems(keepplace).Selected = True
Else
     'whatever you want to do: ignore.... do something.... msgbox... etc....
End If

S

 

by: ShauliPosted on 2006-08-19 at 19:58:58ID: 17350014

You may have a point here. If 0 means the first elemnet, then yes, make it keepplace+1, otherwise, trap for 0.

S

 

by: aikimarkPosted on 2006-08-20 at 18:29:34ID: 17353216

If it is possible that your users or (other) application code is removing nodes/rows, you will also experience this error on a situational basis.

You might make your application more resilient by using the key of the node instead of its index.  This is analogous to using a recordset bookmark instead of the absoluteposition property.

 

by: aikimarkPosted on 2006-08-20 at 18:35:10ID: 17353223

Another thing... this is why you delete list/array items from back-to-front when referencing items by index number.

 

by: dimantePosted on 2006-08-21 at 05:32:44ID: 17355293

Quote>
 If it is possible that your users or (other) application code is removing nodes/rows, you will also experience this error on a situational basis.

You might make your application more resilient by using the key of the node instead of its index.  This is analogous to using a recordset bookmark instead of the absoluteposition property.
</quote>
Absolutely,  Can you explain how to do this "using the key of the node instead of its index"

-D-

 

by: aikimarkPosted on 2006-08-21 at 08:05:40ID: 17356406

Key is a property of a node and must be unique within a listview or treeview.  It is usually assigned a value when you create the node.  The control hashes the key string value and creates a numeric value that is used in a lookup table.

If you can derive some unique value from the row you are adding, it will make your job easier.

==========================
Example:
    ListView1.ListItems.Add , "Now", "Now"
    ListView1.ListItems.Add , "is", "is"
    ListView1.ListItems.Add , "the", "the"
    ListView1.ListItems.Add , "time", "time"

iterating through the listitems:
Debug.Print listview1.ListItems(x).Key, listview1.ListItems(x).index

Now            1
the            3
time           4
is             2

 

by: dimantePosted on 2006-08-21 at 08:10:33ID: 17356453

But how would you find it again and select it:

keepplace = lv.SelectedItem.Index

won't work then.

 

by: aikimarkPosted on 2006-08-21 at 08:17:03ID: 17356499

Dim keepplace_Key As String
keepplace_Key = lv.SelectedItem.Key

 

by: dimantePosted on 2006-08-21 at 16:49:07ID: 17360223

Using your exact code snippet above:

Dim keepplace_Key As String
keepplace_Key = lv.SelectedItem.Key

MsgBox keepplace_Key

The message box is empty when an item is selected....  Please advise.

 

by: aikimarkPosted on 2006-08-22 at 02:10:10ID: 17362050

<<Please advise>>

If you don't supply a key to your items, there will be no key value.

 

by: dimantePosted on 2006-08-22 at 05:44:47ID: 17363173

The items come from a database.  There is an ID field but it is hidden from the list.  So I will make my decision as such.

20120131-EE-VQP-002

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