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This is a discussion on files within the C++ Programming forums, part of the General Programming Boards category; i was trying to just do a basic text fighting style game and ran across a problem. i have it ...

  1. #1
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    files

    i was trying to just do a basic text fighting style game and ran across a problem.

    i have it set up to ask to user enter where you want to save DOS style but then when i goto save it or open it it gives me error:

    Code:
    in.open(save, ios::in);
    it wants text where save is like " " but i wanted what the user inputted right there anyway to fix that?
    hooch

  2. #2
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    did you declare the fstream object?

    fstream in;
    fstream out;


    in.open("file.txt", ios::in);
    out.file("file.txt", ios:ut);

    in.close();
    out.close();

    if save = a string, you will need to put
    save.c_str();

    because it take on a const parameter

  3. #3
    Registered User mrafcho001's Avatar
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    It works fine for me

    -Make sure 'save' is of type char[] or string
    -If string use save.c_str()

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    yea its all declared cause i changed it to a random "blah.txt" and error went away

    so what save.c_str()? how do i use that?
    hooch

  5. #5
    Registered User hk_mp5kpdw's Avatar
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    Quote Originally Posted by mrafcho001
    It works fine for me

    -Make sure 'save' is of type char[] or string
    -If string use save.c_str()

    If it's a string, then you need to use c_str() member function to convert it into a NULL terminated C-style character string.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  6. #6
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    so

    in.open(save.c_str(),ios::in)?
    hooch

  7. #7
    Registered User mrafcho001's Avatar
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    Yup,
    Strings were introduced in C++ but a lot of functions and classes were kept from C and they are expecting a Zero Terminated String or in other words an array of chars with the last one being '\0'.

    When they created the string class they knew it had to be compatible with those functions so they made the member c_str() that acts as a zero terminated string.

    the way you use it:
    string.c_str()
    it will take care of itself from there

  8. #8
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    so if i used a classic char style string it would work fine??
    hooch

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