getMessage.m
% read basic data from messages
%%   DESC
%%   'Status'		double	status of succes
%%   'Station'		string	Station Code
%%   'Detector'		string	Detector Code
%%   'SampleType'		string	sample type
%%   'SystemType'	char	P/G/B
%%   'SRID'		string  sample reference ID
%%   'CollectionStart'	datenum Collection Start Date
%%   'CollectionStop'	datenum Collection Stop Date
%%   'SampleVolume'		double
%%   'Channels'		double	number of channels in spectrum
%%   'AcquisitionStart'	datenum
%%   'AcquisitionStop'	datenum
%%   'AcquisitionReal'	double  Acquisition Real Time (s)
%%   'AcquisitionLive'	double  Acquisition Live Time (s)
%%   'CalibrationDate'	datenum Date of calibration
%%   'idMeas'		double	Linssi:idMeas, if specified in Comment block

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loadCtrlFcn.m
% case 'AddMessages' 模块里调用 getMessage
% The following cases access the figure 'UserData' property value, which is
% a struct with the fields
%
% ud.sid	[] sample id
% ud.loadidx	[] NaN or current sn of spectrum
% ud.source_t	'' 'D' 'M' 'U' or 'A' , according to data source (db, msg, ...)
% ud.aatfile	{} aat file name
% ud.aatfileidx	[] index of spectrum within aat file
% ud.msg	{} message file name
% ud.station	{} station code
% ud.detector	{} detector code
% ud.cstart	[] collection start
% ud.cstop	[] collection start
% ud.astart	[] acquisition start
% ud.astop	[] acquisition start
% ud.cat	[] category
% ud.channels	[] number of channels
% ud.stype	{} sample type
% ud.NS		NS number of spectra

 ud 信息存储于 Af_loadCtrlFcn_data 全局变量