Decompressing *.7Z Files with MATLAB

I have a 7z file. I wish to decompress it using Matlab. How can I do this? The inbuilt matlab functions dont support it.

I have tried,

[status,result] = system(['"C:\Program Files\WinRAR\UnRAR.exe" e ' E:\myFile.7z ' >null']);

however this fails as it gives

result =

UNRAR 5.11 freeware      Copyright (c) 1993-2014 Alexander Roshal

E:\myFile.7z is not RAR archive
No files to extract

On closer inspection unrar.exe is not the same as winrar (which can do 7z). Hence i download 7-zip

[status,result] = system(['"C:\Program Files\7-Zip\7z.exe" e ' E:\myFile.7z]); 

result =

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18

Processing archive: E:\myFile.7z

Error: Can not open file as archive

any ideas?

thanks

Answer 1

[Matlab2010]

solved:

[status,result] = system(['"C:\Program Files\7za920\7za.exe" -y x ' '"' filename{f} '"' ' -o' '"' outputDir '"']);

Also, just in case anyone finds it useful, compressing a file with winrar is done by:

[status,result] = system(['"C:\Program Files\WinRAR\Rar.exe" a '  'C:\Users\user\Desktop\8736_test.rar ' ' C:\Users\user\Desktop\8736.mat' ' >null']);

[sunil kumar]

How to extract .bz2 files in matlab

Could somebody help?

[Walter Roberson]

system() out to the appropriate bzip2 or bunzip program with the appropriate options

https://superuser.com/questions/480950/how-to-decompress-a-bz2-file

It appears that some versions of gzip can handle .tar.bz2 files when given appropriate options.

Answer 2

[Jake August]

This was very helpful. Someone else looking might find this useful.

% for 7zip 15.14 x64 
file7z = 'D:\my.7z';
% rest of code
[dir7z,~,~] = fileparts( file7z );
dir7z = ['"' dir7z '"'];
file7z = ['"' file7z '"'];
[status,cmdout] = system( ['"C:\Program Files\7-Zip\7z.exe" x -o',dir7z,' ',file7z] );

[ZHIWEI WANG]

It works well!

[Verena Schwachmeyer]

Hi Jake August,

thank you. Your solution works for me - but only if I run it once. When this operation is part of an iteration, Matlab freezes during the second loop. Do you have an idea why that is and how to fix it?

-Verena

[Walter Roberson]

Perhaps using .NET Systems.Diagnostic.Process() to start the process instead of system()