creating checkbox - delphi

Question

I am trying to create a few checkboxes, how many is decided by the recordcount of a query. Also i need to set the loction of the check box +38 from the previous location. Anyone give me some help with this? not sure how to create the checkboxes, The rest i should be able to do...anyhow he is what i have so far.
var
i, top,left : integer;
begin
......
left := 81;
top := 119;
while i < qry.RecordCount do
begin
// create check box
// set caption of checkbox to i
// set checkbox loction to left + 38, top
// left = left+38??
end;

Answer 1

After clarifying your needs, I would recommend you to use TObjectList as a container for your check boxes. This list can own the objects, what allows you to release them by a simple removing the item from the list either by Clear or by Delete. It also provides a simple access to each element by typecasting the obtained indexed item object to your known class type. More in the following untested pseudo-code:
uses
Contnrs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
CheckList: TObjectList;
public
{ Public declarations }
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
CheckList := TObjectList.Create;
// setting OwnsObjects to True will ensure you, that the objects
// stored in a list will be freed when you delete them from list
CheckList.OwnsObjects := True;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
// this will also release all check boxes thanks to OwnsObjects
CheckList.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
I: Integer;
CheckBox: TCheckBox;
begin
...
CheckList.Clear; // this will free all check boxes
for I := 0 to RecordCount - 1 do // iterate over your recordset
begin
CheckBox := TCheckBox.Create(nil); // be sure to use nil as an owner
CheckBox.Parent := Self; // where will be laying (Self = Form)
CheckBox.Caption := IntToStr(I); // caption by the iterator value
CheckBox.Top := 8; // fixed top position
CheckBox.Left := (I * 38) + 8; // iterator value * 38 shifted by 8
CheckBox.Width := 30; // fixed width
CheckList.Add(CheckBox); // add the check box to the list
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
// this will check the first check box from the list (be careful to indexes)
TCheckBox(CheckList.Items[0]).Checked := True;
// this will delete 3rd check box from the list (using Clear will delete all)
CheckList.Delete(2);
end;

Answer 2

Your pseudo code translates almost literally into Delphi code although it's better to use a for loop here:
for I := 0 to qry.RecordCount-1 do
begin
CheckBox := TCheckBox.Create (Self); // the form owns the checkbox
CheckBox.Parent := Self; // checkbox is displayed on the form
CheckBox.Caption := IntToStr (I);
CheckBox.Top := Top;
CheckBox.Left := 81 + I*38;
end;
BTW, you don't have to free the created checkbox thanks to the ownership mechanism built into the VCL.