procedure TForm1.Button1Click(Sender: TObject);
var
  Lpos,Cpos,LineLength:integer;
begin
   Lpos := SendMessage(memo1.Handle,EM_LINEFROMCHAR,Memo1.SelStart,0);
   Cpos := SendMessage(memo1.Handle,EM_LINEINDEX,Lpos,0);
   LineLength := SendMessage(memo1.handle, EM_LINELENGTH, Cpos, 0);
   CPos := Memo1.SelStart-CPos;
 
   Label1.Caption:='Aktif Satır no: '+IntToStr(Lpos);
   Label2.Caption:='Aktif Sütun no: '+IntToStr(Cpos);
   Label3.Caption:='Karakter sayısı: '+IntToStr(LineLength);
end;