How do I specify the compression level to gzip?

Question

sunil anandatheertha 2011-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/11910-how-do-i-specify-the-compression-level-to-gzip

评论： raym 2018-4-19

Is there a way I can specify the zip compression to "best compression" or "normal compression".

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Answer 1

Jan 2011-7-19

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11910-how-do-i-specify-the-compression-level-to-gzip#answer_16299

在 MATLAB Online 中打开

This is the core method:

function zipLevel(ZIPFile, FileList, Level)
import java.io.*
import java.util.zip.*
import com.mathworks.mlwidgets.io.InterruptibleStreamCopier.*
if nargin < 3, Level = 6; end
% Create output stream and set the level of compression:
try
   fileOut = FileOutputStream(ZIPFile);
catch
   error(['*** ', mfilename, ': Cannot open for output: ', ...
         char(10), '    ', ZIPFile]);
end
zipOut = ZipOutputStream(fileOut);
zipOut.setLevel(Level);
% This InterruptibleStreamCopier is unsupported and
%  may change without notice.
StreamCopier = getInterruptibleStreamCopier;
% Append files to zip file:
FileList = cellstr(FileList);
for iFile = 1:numel(FileList)
   aFile = FileList{iFile};
   fileIn = FileInputStream(aFile);
   zipObj = ZipEntry(aFile);
   zipOut.putNextEntry(zipObj);
   StreamCopier.copyStream(fileIn, zipOut);
   fileIn.close;
   zipOut.closeEntry;
end
zipOut.close;
fileOut.close;

This should be expanded by checking the the existence of file, getting the contents of folders and using a root folder for relative file names. Comments and file times can also be included by this method.

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raym 2018-4-19

Hi, I run your code and found that the filelist not compressed into the ZIPFile. instead, when I double click the zip file, it directly opens the D drive, and all the hard drive was indexed from here. But the file size is only 140kb.

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