Thread: fstream

  1. #1
    Registered User
    Join Date
    Jun 2007


    Hi everybody. Does anybody know of a way to insert a line of text in the begging of the textfile without having to read an entire file in a loop? Preferably using ifstream? Thank you for the replies.

  2. #2
    Registered User
    Join Date
    Jan 2005
    You cannot do what I think you want with fstream. I'm not sure you could even do it even with platform specific file i/o functions.

    However, you can do it without using a loop. Just read the entire contents of the file into a string via a stringstream, then output the new first line followed by that string.
    ostringstream ostr;
    ostr << in_file.rd_buf();
    out_file << "this is the new first line.\n" << ostr.str();

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