problems with ifstream and ofstream!! help me please!!!

This is a discussion on problems with ifstream and ofstream!! help me please!!! within the C++ Programming forums, part of the General Programming Boards category; I have a nice save function, except for a minor (well major) problem. There are no errors at compile or ...

  1. #1
    Unregistered Leeman_s's Avatar
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    problems with ifstream and ofstream!! help me please!!!

    I have a nice save function, except for a minor (well major) problem. There are no errors at compile or anything like that. But when I run the program and it gets to a certain line of code I get a windows error that says "blah.exe has encountered an error and must be closed. Sorry for any inconvenience.......". You know the rest. I have windows xp. This happened once before when I didnt initialize a variable, i think. Anyhow, there is nothing like that that could cause a problem. I've zeroed in on the lines where the windows error pops up:

    ofstream save("player.txt")

    save>>current_room->id>>"\n";

    save>>current_weapon->id>>"\n";

    there are 3 others. this is in main:

    Code:
    struct ROOM
    {
    ROOM* north;
    ROOM* south;
    ROOM* east;
    ROOM* west;
    int id;
    };
    
    ROOM chamber;
    ROOM hallway;
    chamber.north=&hallway;
    chamber.id=1;
    
    ROOM* current_room;
    
    current_room=&chamber.north;
    ...so current_room points to another variable of type room, which has an element that points to another variable of type room. this isnt the exact code, but its just about exact. i pass current_room to my saving function. when i do save>>current_room->id;, i get the windows error. It also happens with other variables that point to something. i've even tried saying something like:

    int id=current_room->id;

    and using 'id' instead of 'current_room->id'.that doesnt even work and it is a regular integer! i know that i can use current_room and things that it points to in functions because there are many others that do. this just makes no sense at all to me. when i get home i'll post the exact code, but i've pretty much explained it all. It makes no sense! help!

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    ofstream save("player.txt")

    save>>current_room->id>>"\n";

    save>>current_weapon->id>>"\n";
    If save is an ofstream object and you are writting stuff to it, don't you need to use << and not >>.
    struct ROOM
    {
    ROOM* north;
    ROOM* south;
    ROOM* east;
    ROOM* west;
    int id;
    };

    ROOM chamber;
    ROOM hallway;
    chamber.north=&hallway;
    chamber.id=1;

    ROOM* current_room;

    current_room=&chamber.north;
    chamber.north is a pointer as is current_room, so you probably just need to say current_room = chamber.north.
    i pass current_room to my saving function. when i do save>>current_room->id;, i get the windows error. It also happens with other variables that point to something.
    Again, maybe a case of using >> where you should be using <<.
    "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

  3. #3
    Unregistered Leeman_s's Avatar
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    i know that i have all the sytax right for the structs and things, i was just writing taht code off the top of my head. also the << and >> are correct. i'll post the actual code later when i get home.

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