void hook_KeyPressed(object sender, KeyPressedEventArgs e)
        {
            if (txbSaveTo.Text == "")
            {
                showTip("请设置正确的保存地址!");
                return;
            }

            string hotKey = "";

            hotKey += ((e.Modifier & ModifierKeys_e.Control) == ModifierKeys_e.Control) ? "Ctrl+" : "";
            hotKey += ((e.Modifier & ModifierKeys_e.Alt) == ModifierKeys_e.Alt) ? "Alt+" : "";
            hotKey += ((e.Modifier & ModifierKeys_e.Shift) == ModifierKeys_e.Shift) ? "Shift+" : "";
            hotKey += e.Key.ToString();

            //showTip("已捕获所设置的快捷键:" + e.Modifier.ToString() + " + " + e.Key.ToString());
            showTip("已捕获所设置的快捷键:" + hotKey);

            doDownload();
        }