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How do I pass a filename to a routine in Matlab's command window?

조회 수: 5(최근 30일)
Harald von der Osten
Harald von der Osten 2021년 9월 19일 12:51
편집: Jan 2021년 9월 23일 9:09
In the Matlab Command window I would like to run a function with an input parameter, like this:
>> xxxreplace oldGEOPLOT
s =
"./html/oldGEOPLOT.html"
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in xxxreplace (line 14)
ff=fread(fid,'*char')';
I'm using this code :
function file=xxxreplace(x)
f=string(x);
s=strcat('./html/',f,'.html')
fid=fopen(s,'r');
ff=fread(fid,'*char')';
fclose(fid);
ff =strrep(ff,'.png" alt="">','.png" alt="" width="360">');
fid=fopen('./html/new.html','w');
fprintf(fid,'%s',ff);
fclose(fid);
disp(s)
end
Why do I get this error?
Thanks a lot,
Harry
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채택된 답변

Jan
Jan 2021년 9월 19일 14:03
편집: Jan 2021년 9월 23일 9:09
The error message is clear: The file does not exist. Although you assume, that the current folder is the same, this is not true. Check this explicitly:
function file = xxxreplace(x) % What is "file"?
s = fullfile('./html/', [x, '.html']);
[fid, msg] = fopen(s, 'r');
assert(fid > 0, msg);
ff = fread(fid,'*char')';
fclose(fid);
ff = strrep(ff,'.png" alt="">','.png" alt="" width="360">');
[fid, msg] = fopen('./html/new.html', 'w');
assert(fid > 0, msg);
fprintf(fid, '%s', ff);
fclose(fid);
end
Trusting on the current folder is a bad programming practice. Any timer or gui callback might change the current folder unexpectedly. Prefer to use absolute file names.
  댓글 수: 3
Harald von der Osten
Harald von der Osten 2021년 9월 19일 14:32
hey, now it works:
changing
s = fullfile('./html/', [f, '.html']);
to
s = fullfile('./html/', [x, '.html']);
made obviously the job. Thanks to all who helped me !!

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