Hello

I am currently working in CBuilder 4, but I suppose the following question/concept will apply to any version.

When dropping a new object onto a form, (eg. a label) CBuilder automatically names it, with the object type and a number, (eg. label1)
When more objects are dropped, the object numbers are sequentially incremented (label2, label3, label4, etc)

Now, if I wanted to modify a common field in a whole bunch of objects (say label1 to label10) using a loop, how would I address these objects?

-g

I'm not sure i understood the question
any way if you want to loop through controls
you have to:
1- make sure your interested controls are in same container (say groupBox)
2- make sure their tab stops are sequenced
3- use the following code

OnClick()
{    
    for(int i=0; i<GroupBox1->ControlCount; i++)
    {
        TLabel* activeControl = (TLabel*)GroupBox1->Controls[i];
        activeControl->Caption = IntToStr(i);
    }
}

note1: if Tab Stops are not in sequence, try to jump with i in the loop
note2: remember that Form is a container itself, so you can use Controls[index] without GorupBox preceeding it, but this will affect all controls on the form.

Mohammad Nasim

: I'm not sure i understood the question
: any way if you want to loop through controls
: you have to:
: 1- make sure your interested controls are in same container (say
: groupBox)
: 2- make sure their tab stops are sequenced
: 3- use the following code
:

: 
: OnClick()
: {    
:     for(int i=0; i<GroupBox1->ControlCount; i++)
:     {
:         TLabel* activeControl = (TLabel*)GroupBox1->Controls[i];
:         activeControl->Caption = IntToStr(i);
:     }
: }
: 

:
:
: note1: if Tab Stops are not in sequence, try to jump with i in the
: loop
: note2: remember that Form is a container itself, so you can use
: Controls[index] without GorupBox preceeding it, but this will affect
: all controls on the form.
:
: Mohammad Nasim

I think it's more save to check if the TControl which you'd like to change is really a 'TLabel'. You should use 'InheritsFrom'.

OnClick()
{
  // count all controls
  for(int i=0; i<GroupBox1->ControlCount; i++)
	{
	  // check if the control is really a TLabel
	  if(GroupBox1->Controls[i]->InheritsFrom(__classid(TLabel)))
		{
		  // change the name of the label starting with 1
		  ((TLabel *)GroupBox1->Controls[i])->Name = "Label" + IntToStr(i + 1);
		}
	}
}

Good luck,

PiSymbol