大华NVR通过SDK接入EasyCVR平台如何过滤无效通道？

		//登录成功，获取通道信息
		int nRetLen = 0;
		NET_DEV_CHN_COUNT_INFO stuChn = { sizeof(NET_DEV_CHN_COUNT_INFO) };
		stuChn.stuVideoIn.dwSize = sizeof(stuChn.stuVideoIn);
		stuChn.stuVideoOut.dwSize = sizeof(stuChn.stuVideoOut);
		if (CLIENT_QueryDevState(ret, DH_DEVSTATE_DEV_CHN_COUNT, (char*)&stuChn, stuChn.dwSize, &nRetLen))
		{
			nChnNum = stuChn.stuVideoIn.nMaxTotal;
		}
		else
		{
			nChnNum = stDevInfo.byChanNum;
		}

			int index = 0;
			//*channelSizes = nChnNum;
			char names[DAHUA_CHANNEL_INFO_ARR_MAX_LEN][32] = {};
			CLIENT_QueryChannelName(ret, names[0], 32 * DH_DEVSTATE_DEV_CHN_COUNT, &nChnNum);
			//通道信息
			if (lpChannels != NULL){
				for (int i = 0; i < stDevInfo.byChanNum; i++){
					if (i < DAHUA_CHANNEL_INFO_ARR_MAX_LEN){
						//获取码流
						const int channum = 1;
						DWORD dwBitRate[channum] = { 0 };
						int retlen = 0;
						BOOL bRet = CLIENT_QueryRemotDevState(ret, DH_DEVSTATE_BITRATE, i, (char *)dwBitRate, channum*sizeof(DWORD), &retlen);
						if (!bRet || retlen != channum*sizeof(DWORD)){
							printf("[DAHUA SDK S] \r\n");
							printf("[%s] DH_DEVSTATE_BITRATE bRet=%d,retlen=%d,chnNum=%d,sizeof()=%d \r\n", ip, bRet, retlen, nChnNum, sizeof(DHDEV_CHANNEL_CFG));
							printf("[DAHUA SDK E] \r\n");
						}
						else{
							printf("[DAHUA SDK S] \r\n");
							printf("[%s] DH_DEV_CHANNELCFG dwBitRate=%d \r\n", ip, dwBitRate);
							printf("[DAHUA SDK E] \r\n");
							//strncpy(lpChannels->arr[i].name, names[i], 32);
							memcpy(lpChannels->arr[index].name, names[i], 32);
							lpChannels->arr[index].channelNum = i;
							lpChannels->arr[index].online = 1;
							index++;
						}
					}
					else{
						break;
					}
				}
			}
			*channelSizes = index;