copy the content of a text file to another text file

Question

Diana Acreala 2011-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/23951-copy-the-content-of-a-text-file-to-another-text-file

Hello,

I have several text files and each contains 3 things that I need to know(user name, date, comments). I am interested to create another text file where I want to copy only the comment from each file. (So to see a history of all the comments.)

I tried this:

            fid = fopen('info.txt'); //my txt file containing the 3 info
            F = fread(fid, '*char')'
            fclose(fid);
            CommentsHistory = fopen('CommentsHistory.txt', 'wt');
            fprintf(CommentsHistory,'\nComments history:\n\n');
            fprintf(CommentsHistory,'%-50s\t',F);
            fclose(CommentsHistory);

But with no result, I can see only the result of this line:

fprintf(CommentsHistory,'\nComments history:\n\n');

I must say that I tried with this code to copy everything what is in info.txt (so not only the comments). Copying only the comments probably will be another problem...

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Jan 2011-12-14

Does your F contain any zeros? can you display it in the command window? Are you looking to the correct folder?

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Answer 1

Eric Pahlke 2011-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/23951-copy-the-content-of-a-text-file-to-another-text-file#answer_31479

在 MATLAB Online 中打开

Not sure why why your code doesn't work, did you try:

open CommentsHistory.txt

The code below is how I solved a similar problem of trying to get data from specific fields in a text file. It only works if the relevant strings are on the same line as a unique text cue (stored in the first column of "Fields") that indicates where they sit in the file.

            fid = fopen('info.txt'); %my txt file containing info
          % First column is the identifier to searched for
          % Second column is the var name to store the data in
          Fields = {
          'UserName: ',  'UN';...
          'Date: '    ,  'D';...
          'Comments: ',  'Com';...
           };   
      for jj = 1:length(Fields)
          found = 0;
          frewind(fid); % With this the fields can be out of order
          % Advance the file until we find the text cue, 
          % then save the value
          while ~found
              currentline = fgetl(fid);
              if currentline == -1
                  % End of file
                  error('Text cue not found: %s',Fields{jj,1}); 
              end
              startind = strfind(currentline,Fields{jj,1});
              if ~isempty(startind)
                  % Dont want to count the identifier as data
                  startind = startind + length(Fields{jj,1});
                  val = currentline(startind:end);
                  % The next line stores the data in the variable
                  % named in column 2 of "Fields"
                  eval(sprintf('%s = val;',Fields{jj,2}));
                  found = 1;
              end    
          end
      end             
fclose(fid);            
fid2 = fopen('CommentsHistory.txt', 'w');
fprintf(fid2,'\nComments history:\n\n');
fprintf(fid2,'%s',Com);
fclose(fid2);
fprintf(' Name was %s, Date was %s, Comments was %s',UN,D,Com)

The example info.txt I checked this with is:

UserName: Bob

Date: 2/22/2002

Comments: These are my comments

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Answer 2

Diana Acreala 2011-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/23951-copy-the-content-of-a-text-file-to-another-text-file#answer_31515

在 MATLAB Online 中打开

Hy!

Thank you for your answers!:)

Finally I solve my problem. I did a trick if I may say so. This is what I did:

for i=1:txt_file_nr
    fid = fopen('versioninfo.txt');
    [content]=textread('versioninfo.txt', ...
'%s', 7) % where 'content' will be a cell
    versiunea{i,1}=content{1,1} %first cell that contains the version number
    comentariu{i,1}=content{5,1} % last cell that contains the comment
end