/// <summary>
        /// 关闭音频
        /// </summary>
        public Int32 CloseAudio()
        {
            Int32 iRet = -1;

            if (m_lHandle != -1)
            {
                iRet = VsClientAPI.VSSP_ClientStopAudio(m_lHandle);
            }
            return(iRet);
        }