Clear alarms of partition.
BOOL NET_DVR_AlarmHostClearAlarm( LONG lUserID, DWORD dwSubSystemNum );
[IN] Value returned by NET_DVR_Login_V40.
[IN] Partition No., which starts from 0.
Return TRUE for success, and return FALSE for failure.
If FALSE is returned, you can call NET_DVR_GetLastError to get the error code.