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std::getline() question

Started by Chozo Nov 6, 2004 at 11:49 PM 3 replies 850+ views

Original Post

Nov 6, 2004 at 11:49 PM

I've got a file that can be either DOS or Unix text (so \r\n or \n delimiter depending on where it was created). I want to use std::getline(infile, string) but I can't figure out an easy way to not be bothered with differing EOL characters. Right now the \r isn't being stripped out as an EOL (since \n is the only delimiter std::getline() looks for). Is the best thing to check for the \r and remove it if it's there, or is there a cleaner way to get it done while still removing the \n?

Oluseyi

526

Oluseyi

Nov 6, 2004 at 11:59 PM

AFAIK, it doesn't matter. You can always convert input files to Unix format (\n only) if you're still concerned, though.

Bincho

Nov 7, 2004 at 12:03 AM

You could not use getline(). If you loaded the entire file into a string, you could then use the member functions of the string to parse through the file and remove each line, including or not including blank lines.
You would use the following member functions:
substr(), find_first_of(), and erase()

You would loop through the string, finding the first of either delimiter. When you found it, you would get the substring of the beginning of the string to that delimiter, and store that in a vector of strings or whatnot. Then you'd erase the portion read. Rinse, and repeat.

TeamWhore

Nov 7, 2004 at 12:43 AM

I've actually had that problem reading console input on a cross-platform app - windows adds the \r, which screws up getline() code that works fine in linux. I never really did fix that problem, I just wrote around it :\

Chozo

Author

Chozo

Nov 7, 2004 at 1:27 AM

Ahhh... I even knew that reading the whole file and parsing that would be better. Thanks for reminding me. :)

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