Question

I want to parse a text file to get what I want and create another txt file in c++.
I have a text file which looks something like this.

User :

Group : 

Comment1 :

Comment2 :

*** Label ***

ID : Nick

PASS : sky123

Number ID : 9402

*** End of Label ***

######################################

And goes on.
I basically want to create a new txt file which leaves all lines which contains colon(:) and erase the rest such as “* Label *“, and save the result in a new txt file.
The answer to that txt file would be

User :

Group :

Comment1 :

Comment2 :

ID : Nick

PASS : sky123

Number ID : 9402

How do I do this in a simple way?
Thank you very much.

Answer 1

I have not tested this, but you get the idea.

void foo(ifstream& ifs, ofstream& ofs)
{
    while ( !ifs.eof() )
    {
        string line;
        getline(ifs, line);
        if (line.find(":") != string::npos)
            ofs << line;
    }
}