Deleting Text from a Text file

This is a discussion on Deleting Text from a Text file within the C++ Programming forums, part of the General Programming Boards category; >> So please could some one point me in the right direction. Prelude gave you the steps already. Is there ...

  1. #1
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    >> So please could some one point me in the right direction.
    Prelude gave you the steps already. Is there something specific you are having trouble implementing?

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    Deleting Text from a Text file

    Hello everybody

    I am new to c++ and I am trying to find a way to delete a line of text from a text file.

    My program is writing to the file no problem and I can read it back in and display it in a DOS console screen. But one of the options I need is to find a line of text and then delete that line from the file.

    Is C++ capable of doing such a thing?

    plus how do you search a text file for a specific word or words?

    Thank you for any help you may provide.

  3. #3
    Code Goddess Prelude's Avatar
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    >Is C++ capable of doing such a thing?
    No. I say no because when people ask if C++ is "capable" of doing something, they want a simple function like:
    Code:
    #include <magic>
    
    bool delete_line_from_file ( fstream& file, int line_number );
    Can you do it? Yes. Does C++ give you the tools to do it? Yes. Is everything you could ever want wrapped up in a nice little package with a bow? Of course not. To delete a line from a file, the common solution is to do something like read the file into a vector, delete the line you want to delete, and then overwrite the file with your changes because most files don't support record-oriented operations like deletion of a line.

    >plus how do you search a text file for a specific word or words?
    The string class has a slew of find member functions that will help you pick out pieces.
    My best code is written with the delete key.

  4. #4
    Reverse Engineer maxorator's Avatar
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    Is C++ capable of doing such a thing?
    C++ is capable of doing almost anything. (Unless you want to do something unrealistic)
    "The Internet treats censorship as damage and routes around it." - John Gilmore

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    Ok then I understand C++ is capable of doing such a task

    And I understand that it will not be easy to do.

    I know it won't be an easy thing to do.

    If it was just a simple one line command then why would I be asking
    a forum how to do it.

    So please could some one point me in the right direction.

  6. #6
    The superhaterodyne twomers's Avatar
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    * Read in a file to some variable, a vector of strings was suggested.
    * Decide what you want to be taken out from the file, ie a line number or something
    * Delete that from memory (from the variable).
    * Save the variable's contents to the same file name.

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