Добавление записей в TStrings, TTreeView или TListView

Оформил: DeeCo

{ 
  Bei der Klasse TStrings und den Komponenten TTreeview/TListview gibt es die 
  Moglichkeit, neben dem einfachen einfugen eines Strings auch Objekte mitanzufugen. 
  Da eine Klasse TObject erwartet wird, muss man einen kleinen Umweg programmieren. 
}

 { 
  The Classes TStrings and the components TTreeview/TListview allow you to add an 
  additional Object to a string. 
  Since a TObject is expected, you need to make a little detour to achive this. 
}


 type
   TMyRecord = record
     id: Integer;
     Name: string;
     {...}
   end;
   PMyRecord = ^TMyRecord;

   {...}


   { In this example I use a Listview component }

 procedure Form1.Form1Create(Sender: TObject)
   var
   i: Integer;
   pRec: PMyRecord;
 begin
   for i := 0 to 10 do
   begin
     new(pRec);
     pRec.id := i;
     pRec.Name := 'Entry' + IntToStr(i);
     {...}
     ListView1.AddItem('Entry' + IntToStr(i), Pointer(pRec));
   end;
 end;

 { To retrieve the stored records just use this: }

 procedure Form1.ListView1Click(Sender: TObject);
 var
   i: Integer;
   xRec: TMyRec;
 begin
   for i := 0 to Listview1.Count - 1 do
     if ListView1.Selected[i] then
     begin
       xRec := PMyRecord(ListView1.Items.Objects[i])^;
       ShowMessage(Format('Record #%d Name: %s', [xRec.id, xRec.Name]));
     end;
 end;

 { finally do not forget to free assigned memory }

 procedure Form1.FormClose(Sender: TObject);
 var
   i: Integer;
 begin
   for i := 0 to ListView1.Count - 1 do
     if ListView1.Items.Objects[i] <> nil then
       Dispose(ListView1.Items.Objects[i]);
 end;