(Download image)

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matlabgeek 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266701-download-image

编辑： matlabgeek 2016-2-11

采纳的回答： Walter Roberson

If I have a txt file, which contains the url that downloads images, how do we write the script to do that?

e.g. txt file information:

.. .. ...

采纳的回答

Walter Roberson 2016-2-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/266701-download-image#answer_208632

编辑：Walter Roberson 2016-2-5

在 MATLAB Online 中打开

projectdir = fullfile(pwd, 'saved_images');         %location to store the files
if ~exist(projectdir, 'dir')
   mkdir(projectdir);
end
fid = fopen('TheFile.txt', 'rt');
imcount = 0;
while true
  this_url = fgetl(fid);
  if ~ischar(this_url)
    break;        %end of file
  end
  if isempty(strtrim(this_url))
    continue      %empty line, probably near end of file
  end
  [url_path, url_img, url_ext] = fileparts(this_url);
  dest_file = fullfile(projectdir, [url_img url_ext]);
  if exist(dest_file, 'file')
    fprintf('skipping existing %s\n', dest_file);
    imcount = imcount + 1;
    urls{imcount} = this_url;
    img_files{imcount} = dest_file;
    %img_content{imcount} = imread(dest_file);
    continue;
  end
  fprintf('loading ... %s\n', url_img);
  try
    urlwrite(this_url, dest_file);
    imcount = imcount + 1;
    urls{imcount} = this_url;
    img_files{imcount} = dest_file;
    %img_content{imcount} = imread(dest_file);
  catch
    fprintf('failed downloading %s from "%s"\n', url_img, this_url);
  end
end

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matlabgeek 2016-2-5