Alarm input parameter structure of video intercom
struct{ DWORD dwSize; BYTE byIOUseType; BYTE byRes[63]; }NET_DVR_VIDEO_INTERCOM_IOIN_CFG, *LPNET_DVR_VIDEO_INTERCOM_IOIN_CFG;
Structure size.
Alarm input usage: 0-disabled, 1-for unlocking, 2-represents door status, 0xff-custom.
Reserved, set to 0.