如何在MATLAB中写入文本文件？

Question

I need to remove 'index.html' string from every line of my index.html files....

I need this to be done in MATLAB.

Here is what I have so far...

I don't know how to write the line, after I've modified it, back over the same line in the html file.

fid=fopen('index.html');

while ~feof(fid)

    tline=fgetl(fid);

if ~isempty(strfind(tline,'index.html'))
    remline=strrep( tline ,'index.html','');

**% fprintf(fid,remline);
%  fprintf('\n')**

end

end

Update

This solution worked for me:

function WriteToFile(filename)



fid = fopen(filename, 'r+');
fid2 = fopen('index.txt', 'w');


while ~feof(fid)

    tline=fgetl(fid);

    if ~isempty(strfind(tline,'index.html'))
        remline=strrep(tline,'index.html','');

        fprintf(fid2, '%s\r\n', remline);
    else
        fprintf(fid2, '%s\r\n', tline);
    end
end

fclose(fid);
fclose(fid2);

delete(filename)
keyboard
movefile('index.txt','index.html')

Answer 1

将％d替换为％s以获取实际文本

Answer 2

Here is an example function:

function WriteToFile(filename, text)
%open file with write permission
fid = fopen(filename, 'w');
%write a line of text
fprintf(fid, '%d\n', text);
%close file
fclose(fid);

Answer 3

If you're working with text files it would be useful to study the documentation for functions such as fileread and textscan . There's nothing wrong with the approach you are taking (well, apart from the obvious thing that you haven't got it working yet) but it's a bit more laborious than it needs to be.

I expect that if you read the file into a Matlab string (space limits permitting) then run a regex over it you can probably make your replacements in a oner.

Answer 4

Your call to fopen() opens the file for reading only, which is why the fprintf() call fails. However, this approach isn't going to work as it stands, because you are changing the length of the text lines. I suggest you read each line from the input file, make your changes to it, then write it out to a temporary output file. When you have processed every input line, close both files, delete the input file, and rename the temporary output file to the original input file name.

Alternatively, as HPM suggests, read the whole file into memory in one go, process each line, and write it all out in one go 'on top of' the input input file.

Answer 5

Modifying Niko's answer (replacing %d with %s) to put actual text into the file a1.m:

fid = fopen('a1.m','w');%open file for writing
fprintf(fid, '%s\n', 'some_text');%write a line of text
fclose(fid);%close file