触发抓图的通道信息。
struct{ DWORD dwMaxRelCaptureChanNum; DWORD dwChanNo[MAX_CHANNUM_V40]; BYTE byRes[32]; }NET_DVR_REL_CAPTURE_CHAN_V40, *LPNET_DVR_REL_CAPTURE_CHAN_V40;
NET_DVR_EVENT_CAPTURE_V40