Hi Oliver,
On Sat, Jan 28, 2012 at 10:57 AM, Oliver Sims <
[email protected]> wrote:
> The ooDialog Reference (build 7341) section 16.41 ~getItemInfo (ListView)
> says::
> Return value:
> Returns .true on success and .false on error.
>
> On my ListView, the user selects an item, which enables a pushbutton. On
> pressing the pushbutton, the selected item is actioned. This works fine.
> But
> if I select an item, then de-select it, then press the pushbutton, the
> value
> -1 is returned from ~getItemInfo, and the program closes with an error. I
> expected it to return .false.
>
No that's a misinterpretation of what happened on your part. Nothing is
returned from getItemInfo(), rather a syntax condition has been raised,
which is not trapped, that causes the interpreter to close.
>
> Is this an error on my part, or is the documentation incomplete? The
> ooDialog Reference also says, under "Details":
>
This is an error on your part, the documentation is complete, (in my
opinion.)
>
> Raises syntax errors when incorrect arguments are detected.
>
Which is exactly what happened. -1 is not a valid list item index.
>
>
>
> The console output is:
>
> CustomerListView-showCustomer-01: item selected = -1
> 202 *-* if lvCustomers~getItemInfo(item, info)
> Error 88: Invalid argument
> Error 88.907: Argument 1 must be in the range 0 to 4294967295; found "-1"
>
So here, we see exactly what you did wrong, spelled out in detail. <grin>
Argument 1, which is the item index is incorrect. It must be in the range
of 0 to 429... and you passed in -1. -1 is not a valid item index.
>
> The code is:
>
> ::METHOD showCustomer UNGUARDED
> expose lvCustomers rootDlg
> item = lvCustomers~selected
> say "CustomerListView-showCustomer-01: item selected =" item
> info=.Directory~new
> if lvCustomers~getItemInfo(item, info) then do
> ...
> end
> else do
> say "No item selected!"
> end
>
>
You just have your logic there a little inverted. The method should be
something like this:
::METHOD showCustomer UNGUARDED
expose lvCustomers rootDlg
item = lvCustomers~selected
say "CustomerListView-showCustomer-01: item selected =" item
if item < 0 then do
say "No item selected!"
end
else do
info=.Directory~new
if lvCustomers~getItemInfo(item, info) then do
-- Process the information returned
...
end
end
The selected() method is what informs you if an item is selected or not.
The getItemInfo() method requires you to pass in a valid index.
Oh - by the way, these are the type of questions that I would prefer to be
on the ooRexx Users list. I don't see anything wrong with posting them on
the Developers list and will answer questions where ever I see them.
However, very few users read the developers list. It's true that probably
very few users read the users list either. <grin> But, it makes sense to
me to encourage ooDialog users to read the users list, less sense to
encourage them to read the developers list.
--
Mark Miesfeld
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