Findcomponent causes AV

[MarkLince]

Hi,

I have a Frame with a scrollbox on it and some labels and listboxes on the scrollbox. 

The labels and listboxes are named ADLabel1, ADlabel2, ADLabel3 ....  and similarly the listboxes.

 

trying to cycle through the controls and change properties using for example;

 

for count1:= 0 to mystringlist.count-1 do

begin

   TUniLabel(FindComponent('ADLabel'+inttostr(count1+1))).caption:=mystringlist[count1];

end;

 

But this causes an AV, searched through forum and fincomponent seems to have been a problem in early builds of uniGUI, is it still a problem??

 

I have tried lots of variations of findcomponent but nothing seems to work. 

 

So... any help is gratefully received.

 

Regards

Mark

 

 

[Farshad Mohajeri]

FindComponent returns NIL when it can not find the component. Can it be the case?

[Farshad Mohajeri]

Also make sure you call FindComponent of the correct Owner.

[MarkLince]

Hi Farshad,

Thanks for a quick reply, yes as you say, findcomponent is returning nil and therefore causes AV in my code sample.

I have also tried;

 

var

ADlabel:Tunilabel;

 

 ADLabel:=TUniLabel(ADScroll1.FindComponent('ADLabel'+inttostr(count1+1))); 

 if not (AdLabel = nil) then

 begin

     ADLabel.Caption:='Test';

 end;

 

and of course no AV and caption is not set as ADLabel is nil, but I don't understand why it should be nil. as there is a component called "ADLabel1, ADLabel2, ....." with parent ADScroll1

 

What am I missing? 

 

Thanks

Mark

[Farshad Mohajeri]

How ADLabel(s) are created?

[Farshad Mohajeri]

ADScroll1.FindComponent

Here is the issue.

 

ADScroll1 is the parent not the owner.  FindComponent only works for owner of the control.

[MarkLince]

Hi Farshad,

Thanks again for your help, I feel silly I missed that!!  

 

This works

 

ADLabel:=TUniLabel(ADScroll1.owner.FindComponent('ADLabel'+inttostr(count1+1)));

 

Regards

Mark