Ignore commemts while parsing txt file C-CodePudding

I have a large text file and I am parsing using string stream. Text file looks like this

#####
##bjhbv
nvf
vbhjbj
vfjbvjf
*bj
*bvjbv
.
.
.
.
 FILE
data I want to parse from here to 
.
.
.
.
-FILE 
till here
#shv again comments
.
.

How can I parse only between FILE to -FILE? I can parse inside off it, but i just want to ignore above and below comments. Please help me how to ignore whie reading or parsing from .txt file. Any leads will be appreciated.,

CodePudding user response：

Something like this should do it:

{
  ifstream f_in(input_file_name);
  ofstream f_out(output_file_name);

  string line;
  // discard up to " FILE"
  while (getline(f_in, line) && line != " FILE");
  // copy up to "-FILE"
  while (getline(f_in, line) && line != "-FILE") f_out << line << endl;
}

The ifstream and ofstream will close their respective files upon leaving scope, which is why I showed them within {}.

CodePudding user response：

As you see in the comments, you can discard above FILE. you can use std::istream::ignore

You can give delimiter as FILE then you can process your logic. And put a break with a condition once the '-FILE` match.