Read m file with fgets / fgetl

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Clément P
Clément P 2016-4-19
编辑： Stephen23 2016-4-21
Hi,
I want to read a m file called 'File1.m' and write in the same time a 'File2.m'.
My code (simplified for example) is :
Fin = fopen('File1.m','r');
Fout = fopen('File2.m','w');
while feof(Fin) == 0
line = fgets(Fin);
if regexp(line,'text')
fprintf(Fout,' modified text ');
else
fprintf(Fout,line);
end
end
It works perfectly EXCEPT that fgets is not reading comments in File1 (comments indicated with '%').
Do you know a way to read them? It is actually important comments.
Thanks, Clément
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Clément P
Clément P 2016-4-19
编辑：Clément P 2016-4-19
I think that fgets takes into account the '\n', but fgetl does not. Maybe it is another symptom, but I don't understand why everything is write perfectly except comments. Or maybe it comes from sprintf?
edit : I checked, fgets reads all characters, including comments. I think it comes from fprintf , as the '%' is used to print variables. Do you have an idea how to overpass this?
Clément P
Clément P 2016-4-19
Actually it works with fwrite ;)

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Stephen23
Stephen23 2016-4-19
编辑：Stephen23 2016-4-21
Solution Use fgetl and this:
fprintf(Fout,'%s\n',line);
Explanation there is a very large difference between these:
fprintf(fid,'%s\n',text) % correct
fprintf(fid,text) % what you are doing
because of how escaped characters get handled. Characters that need escaping include %, so when you provide it simply (as you are doing) it does not get interpreted as a simple character, but instead is a special active character. The first line shows the correct solution for your task, with a format string and your text as an argument. Read the fprintf docs for more info on this, or this excellent explanation:
http://www.mathworks.com/help/matlab/matlab_prog/formatting-strings.html

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