public int GetSpeakerDevList(int _fromIndex, int _toIndex, int _size, byte[] devList)//该函数用于获取扬声器设备列表
 {
     try
     {
         LogManager.SystemLog.Debug(string.Format("Start UC_SDK_GetSpeakerDevList"));
         int iRet = UCInterface.UC_SDK_GetSpeakerDevList(_fromIndex, _toIndex, _size, devList);
         if (iRet != 0)
         {
             LogManager.SystemLog.Error(string.Format("Start UC_SDK_GetSpeakerDevList error {0}", iRet));
             return(iRet);
         }
         LogManager.SystemLog.Debug(string.Format("End UC_SDK_GetSpeakerDevList"));
         return(iRet);
     }
     catch (Exception ex)
     {
         LogManager.SystemLog.Debug(ex.ToString());
         return(-1);
     }
 }