procedure TForm1.pingClick(Sender: TObject);
var
  i: Integer;
begin
form1.ping.Enabled:=false;
IdIcmp.ReceiveTimeout:=200;
for i := 0 to Listbox1.Count - 1 do
begin
Application.ProcessMessages;
sleep(100);
IdIcmp.Host:=Listbox1.Items[i];
Listbox1.ItemIndex:=i;
IdIcmp.Ping;
idicmp.Free;
form1.ping.Enabled:=true;
//if stop then Break;end;
end;
procedure TForm1.IdIcmpReply(ASender: TComponent;
  const AReplyStatus: TReplyStatus);
begin
case AReplyStatus.ReplyStatusType of
  rsEcho: Listbox2.Items.Add(IdIcmp.Host+'  成功  耗时(毫秒):'+inttostr(areplystatus.MsRoundTripTime));
  rsError: Listbox2.Items.Add(IdIcmp.Host+'  错误  ');
  rsTimeOut:Listbox2.Items.Add(IdIcmp.Host+'  超时  ');
  rsErrorUnreachable:Listbox2.Items.Add(IdIcmp.Host+'  地址错误  ');
else
  Listbox2.Items.Add(IdIcmp.Host+'  其他未知错误  ');
end;
Listbox2.ItemIndex:=Listbox2.Count-1;
end;出错提示
Listbox1.Items[i]里面有200多个IP地址
报错如何处理呢