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Thread: Mac line breaks

  1. #1
    Join Date
    Aug 2009
    Qt products

    Default Mac line breaks


    My input file (a csv text file) was created with a Mac. Since Mac uses different line breaks my application which runs in Windows or Linux cannot properly read the file line by line (it reads the entire row). I know this used to be a bug in Qt. Has it been fixed? Can I now read Mac files (with Mac line braks) if my program runs on windows. This is how I do it:

    Qt Code:
    1. QFile infile(Filename); if(! | QIODevice::Text)) {exit(1);}
    2. QTextStream in_stream(&infile);
    4. while(!in_stream.atEnd())
    5. {
    6. QString row = in_stream.readLine();
    7. }
    9. infile.close();
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  2. #2
    Join Date
    Mar 2009
    Brisbane, Australia
    Thanked 1,596 Times in 1,524 Posts
    Qt products
    Qt4 Qt5
    Unix/X11 Windows
    Wiki edits

    Default Re: Mac line breaks

    You could have answered this question for yourself in less time than it took to post. Feed it an ancient Mac file with CR line endings and see what you get. Alternatively, look at the QTextStream source where you will see that it looks for the single character \n optionally preceded by \r.

    I would not consider this a bug given that the documentation specifically mentions only "\n" and "\r\n" as end-of-line markers, and Qt is not supported on Mac OS 9 or earlier. Mac OS X uses LF line endings so this should not be an issue for files from those systems.

    None of this stops you from handling such files, but you have to do more of the work.

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