Open files with certain file size

Question

David du Preez 2017-3-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332953-open-files-with-certain-file-size

评论： David du Preez 2017-4-1

Hi I have hundreds of files with a similar name. I can open them all with the following code:

% Open the HDF5 File.
for k = 1:365
    FILE_NAME = sprintf('MLS-Aura_L2GP-O3_v04-20-c01_2006d%03d.SUB.he5',k);
    file_id = H5F.open(FILE_NAME, 'H5F_ACC_RDONLY', 'H5P_DEFAULT');
end

now I only want to open files when the file size is greater than 37 KB. How do I do that ?

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Answer 1

KSSV 2017-3-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332953-open-files-with-certain-file-size#answer_261212

在 MATLAB Online 中打开

files = dir('your file extension') ;
% loop for each file 
for i = 1:length(files)
    if files(i).bytes*1000 > 37   % if file size is > 37 do what you want
        filename = files(i).name ;
        disp(filename) 
        %open your file do what you want
    end
end

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David du Preez 2017-4-1

在 MATLAB Online 中打开

Great thanks. Here is my updated script:

for i = 1:length(files)
    if files(i).bytes > 50000
       filename =  files(i).name;
       disp(filename)
         %open files with data
         file_data = H5F.open(filename,'H5F_ACC_RDONLY','H5P_DEFAULT');
         %Data field for data wanted   
         DATAFIELD_NAME = 'HDFEOS/SWATHS/O3 column/Data Fields/L2gpValue';    
         data_id = H5D.open(file_data,DATAFIELD_NAME);
         %Time component
         TIME_NAME='HDFEOS/SWATHS/O3 column/Geolocation Fields/Time';
         time_id = H5D.open(file_data,TIME_NAME);
         data1=H5D.read (data_id,'H5T_NATIVE_DOUBLE', 'H5S_ALL', 'H5S_ALL', ...
              'H5P_DEFAULT');
         time=H5D.read(time_id,'H5T_NATIVE_DOUBLE', 'H5S_ALL', 'H5S_ALL',...
              'H5P_DEFAULT');
         time1lvl=datestr(datevec(datenum(1993,1,1,0,0,0)+time(1)/86400));
      end
  end