/// <summary>
        /// 获取最近联系人的会话列表。
        /// </summary>
        /// <param name="handler">获取最近联系人会话列表的回调</param>
        public static TIMResult IMConvGetConvList(ConvGetConvListDelgate handler = null)
        {
            var ptr = DelegateConverter.ConvertToIntPtr(handler);

            return((TIMResult)TIMClientAPIDef.TIMConvGetConvList(ConvGetConvListResultCallBack, ptr));
        }