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R11173/v2p5/tdmsSubfunctions/TDMS_getPropValue.m
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TDMS_getPropValue.m
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function propValue = TDMS_getPropValue(fid,propDataType,UTC_DIFF,DATE_STR_FORMAT)
%TDMS_getPropValue Returns the property value given the Labview DataType
%
% propValue = TDMS_getPropValue(fid,propDataType,UTC_DIFF)
%
% See Also: TDMS_getDataTypeName
SECONDS_IN_DAY = 86400;
CONV_FACTOR = 695422; %datenum('01-Jan-1904')
UNICODE_FORMAT = 'UTF-8';
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switch propDataType
case 1
propValue = fread(fid,1,'*int8');
case 2
propValue = fread(fid,1,'*int16');
case 3
propValue = fread(fid,1,'*int32');
case 4
propValue = fread(fid,1,'*int64');
case 5
propValue = fread(fid,1,'*uint8');
case 6
propValue = fread(fid,1,'*uint16');
case 7
propValue = fread(fid,1,'*uint32');
case 8
propValue = fread(fid,1,'*uint64');
case 9
propValue = fread(fid,1,'*single');
case 10
propValue = fread(fid,1,'*double');
case 25
propValue = fread(fid,1,'*single');
case 26
propValue = fread(fid,1,'*double');
case 32
stringLength = fread(fid,1,'uint32');
temp = fread(fid,stringLength,'*uint8');
propValue = native2unicode(temp,UNICODE_FORMAT)'; %#ok<*N2UNI>
%propValue = fread(fid,stringLength,'*char')';
case 33
propValue = logical(fread(fid,1,'*uint8'));
case 68
%Eeek, uint64 really????
%Time in seconds since 01/01/1904 0 UTC
%Matlab: days since 01/00/0000 0 i.e. 1 represents 01/01/0000
firstByte = fread(fid,1,'uint64');
secondByte = fread(fid,1,'int64');
tSeconds = firstByte/(2^64)+secondByte;
propValue = datestr(tSeconds/SECONDS_IN_DAY + CONV_FACTOR + UTC_DIFF/24,DATE_STR_FORMAT);
otherwise
error('Unhandled property type: %s',TDMS_getDataTypeName(propDataType))
end
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