How to loop through all files in subfolders in a main folder?

Question

Gopika Rajan 2018-12-28

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/437494-how-to-loop-through-all-files-in-subfolders-in-a-main-folder

编辑： Jason Sebek 2023-2-1

Hello,

I have a main folder and several subfolders in it. Each subfolder has several files within them. I want to create a loop in such a manner that the code would open a subfolder, do what I want it to do and then move to the next one.

Thanks in advance

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Answer 1

Stephen23 2018-12-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/437494-how-to-loop-through-all-files-in-subfolders-in-a-main-folder#answer_354225

编辑：Stephen23 2018-12-28

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

D = 'full path to the main folder';
S = dir(fullfile(D,'*'));
N = setdiff({S([S.isdir]).name},{'.','..'}); % list of subfolders of D.
for ii = 1:numel(N)
    T = dir(fullfile(D,N{ii},'*')); % improve by specifying the file extension.
    C = {T(~[T.isdir]).name}; % files in subfolder.
    for jj = 1:numel(C)
        F = fullfile(D,N{ii},C{jj})
        % do whatever with file F.
    end
end

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Image Analyst 2022-9-29

编辑：Image Analyst 2022-9-29

在 MATLAB Online 中打开

scansubfolders.m

@Emu, try this very well commented demo. Adapt it (from *.bmp) to whatever file extension you want, like .CSV.

% Code to list all sub-folders under some top-level folder.
% function scansubfolders()
clc;
clearvars;
close all;
workspace;
% Ask user to locate some top-level folder.
start_path = pwd;
topLevelFolder = uigetdir(start_path)
if topLevelFolder == 0
    return; % User clicked Cancel button.
end
% Generate list of all subfolders.
allSubFolders = dir(fullfile(topLevelFolder, '**/*')); % All files and folders.
allSubFolders = allSubFolders([allSubFolders.isdir]); % Extract only the folders.
allSubFolders = unique({allSubFolders.folder}); % Throw out duplicates.
% Now we have a list of all folders and subfolders as a cell array.
% Optional: display them in the command window.
disp('Here are the subfolders:');
allSubFolders
% Display BMP files from each subfolder.
for k = 1 : length(allSubFolders)
    % Get the name of this subfolder:
    thisFolder = allSubFolders{k};
    fprintf('Now processing folder #%d of %d : "%s".\n', k, length(allSubFolders), thisFolder); % Print to command window what folder we're processing.
    % Get the file pattern for the files that we want to process.
    filePattern = [thisFolder, '\*.bmp'];
    % Find out names of files with this file pattern in this folder.
    filesInThisFolder = dir(filePattern); % Cell array
    if ~isempty(filesInThisFolder) % If there are files in this folder, do this:
        numFiles = numel(filesInThisFolder); % Store the number of files in this one subfolder.
        % If there are any files, display and process them all.
        for fileNumber = 1 : numFiles
            fullFileName = fullfile(thisFolder, filesInThisFolder(fileNumber).name);
            fprintf(1, 'About to process #%d of %d in this folder : "%s".\n', fileNumber, numFiles, fullFileName);
            % For example, maybe we want to process the file by reading it in as and image and display it.
            % You can process it however you want though.
            imageArray = imread(fullFileName);
            imshow(imageArray);
            title(filesInThisFolder(fileNumber).name);
            drawnow;
            % Optional : Ask user if they want to continue and process the next file.
            if fileNumber ~= numFiles
                promptMessage = sprintf('Done with #%d of %d in this folder.\nDo you want to Continue with file #%d,\nor Cancel to abort?', fileNumber, numFiles, fileNumber+1);
                button = questdlg(promptMessage, 'Continue', 'Continue', 'Cancel', 'Continue');
                if contains(button, 'Cancel')
                    % User wants to quit.
                    return;
                end
            end
        end
    else
        fprintf('    Skipping folder #%d because there are no files in it with our pattern.\n', k); % Print to command window what folder we're processing.
    end
end
uiwait(helpdlg('Check out the command window for the folder and file names.'));