How to replace a certain part of file name

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Raja Bilal Rsb
Raja Bilal Rsb 2018-7-25
评论： Raja Bilal Rsb 2018-7-26
I am writing a small code to that goes through the overall directory scans for all files, and if any image file have not same name pattern it will change it.
loc = 'File Directory';
flist = dir([loc '*.png']);
for ii = 1:1:length(flist)
fname = flist(ii).name;
[~, fn, xt] = fileparts(fname);
img = imread([loc fname]);
idxs = strfind(fn, '_');
label = str2double(fn(idxs(end)+1:end));
if label ~= 0
label= 0;
ffname = fullfile(loc, num2str(label), fname); % full file name
imwrite(img, ffname);
continue;
end
My all files have file names like "m_7_13_10" with 10 being constant at the end. I want to change the 10 at end to 0. File should be in the same directory. What I am missing any one?

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回答（1 个）

Guillaume
Guillaume 2018-7-25
编辑：Guillaume 2018-7-26
Loading the images and saving them back again just to change a filename is a big waste of time. Just rename the files!
An efficient way to do that:
loc = ...
flist = dir(fullfile(loc, '*.png'));
torename = endsWith({flist.name}, '_10.png');
for file = flist(torename)'
movefile(fullfile(loc, file.name), fullfile(loc, regexprep(file.name, '_10\.png', '_0.png', 'preservecase')));
end
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Guillaume
Guillaume 2018-7-26
Ok, if you want to load the image and rename them, it's more or less the same:
loc = ...
flist = dir(fullfile(loc, '*.png'));
torename = endsWith({flist.name}, '_10.png');
for file = flist(torename)'
img = imread(fullfile(loc, file.name);
%... further processing
imwrite(img, regexprep(file.name, '_10\.png', '_0.png', 'preservecase'));
end
Raja Bilal Rsb
Raja Bilal Rsb 2018-7-26
The code is still missing the important thing that not every time last part will not be same. it can be _10,_9,_8 from 0 to 10 can be any. It should convert all these to _0, and than convert the file to gray-scale and crop it to 28*28.

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