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N+1模式设备信息联合体。
struct{
BYTE byUnionLen[512];
NET_DVR_WORKING_DEVICE_INFO struWorkingDeviceInfo;
NET_DVR_REDUNDANT_DEVICE_INFO struRedundantDeviceInfo;
}NET_DVR_NPO_DEV_INFO_UNION, *LPNET_DVR_NPO_DEV_INFO_UNION;
NET_DVR_N_PLUS_ONE_DEVICE_INFO