On Tue, 29 Oct 2013, Bruce wrote:
> I have a need to detect if a particular Slot exists in the .config
> file for an application. Just the Slot not whether any value lines exist
> under it.
>
> There doesn't seem to be a way to do this via gb.settings? I have tried
> using
>
> If Settings.Keys["Filter"] then
>
> but this seems always to be true. Similarly
>
> If Settings["Filter"] then
>
> always seems to be false.
>
> So is there a way to find out if a Slot does exist?
>
> ---- more info -----
> The problem is that the value lines depend on about 8 text boxes set or
> cleared by the user. If one or more of the text boxes are empty then
> that value line will not appear under the [Filter] slot. So I can't
> detect the existence of the slot by detecting a particular value line.
> In fact if they clear all the filter strings then that whole slot will
> disappear.
>
> Thus I need to check if the slot exists, so then I could
> If Settings.Exist["Filter"] then
> GetFilterSettings
> Else
> SetDefaultFilter
> Endif
>
Hmm. Settings["Filter"] will return Null if the slot does not exist. Note
that the slot is also non-existent if you do assign Null like
Settings["Filter"] = Null
which means Settings[sKey] returning Null is a necessary and sufficient
indicator that sKey is not a slot in the Settings.
So, use
If IsNull(Settings["Filter"]) Then
' Settings["Filter"] does not exist...
Endif
in case you want to do something when the "Filter" key does not exist.
Regards,
Tobi
--
"There's an old saying: Don't change anything... ever!" -- Mr. Monk
------------------------------------------------------------------------------
Android is increasing in popularity, but the open development platform that
developers love is also attractive to malware creators. Download this white
paper to learn more about secure code signing practices that can help keep
Android apps secure.
http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk
_______________________________________________
Gambas-user mailing list
Gambas-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/gambas-user
