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指示灯外控报警信息结构体。
struct{
DWORD dwSize;
DWORD dwChannelNo;
NET_DVR_LAMP_STATE struLampStateCtrl;
NET_DVR_TIME struExternalBeginTime;
BYTE byRes1[64];
}NET_DVR_EXTERNAL_CONTROL_ALARM, *LPNET_DVR_EXTERNAL_CONTROL_ALARM;
NET_DVR_SetDVRMessageCallBack_V31 NET_DVR_StartListen_V30