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CVR设备报警信息结构体。
struct{
DWORD dwAlarmType;
NET_DVR_TIME struTime;
NET_ALARM_CVR_SUBINFO_UNION uSubAlarmInfo;
BYTE byRes[256];
DWORD dwNumber;
WORD *pNO;
}NET_DVR_ALARMINFO_DEV_V40, *LPNET_DVR_ALARMINFO_DEV_V40;
NET_DVR_SetDVRMessageCallBack_V30 NET_DVR_StartListen_V30