Thread: a question on classes

  1. #1
    Registered User
    Join Date
    Mar 2011

    Exclamation a question on classes

    i just learned that i could write classes to a file using the function fwrite(). (defined in stdio)

    and i was wondering if i could write the whole class in one of its own functions, perhaps something like this:

    #include <stdio.h>
    class dot{
    	int x;
    	int y;
    	wchar_t* title;
    	void tofile(void);
    ///some other unnecessary functions///
    void dot::tofile(void)
    	FILE* file;
    fwrite(&dot,sizeof(dot),1,file);    ///this is where i am not sure of

  2. #2
    The larch
    Join Date
    May 2006
    Actually you can't write this class to file like this. Storing the address of the string in title doesn't help you retrieve the string value.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  3. #3
    Registered User
    Join Date
    Mar 2011
    So do you have any suggestions?

  4. #4
    Join Date
    Oct 2007
    Inside my computer
    You need to learn yourself Boost Serialization:

    Also, do not put raw pointers in your class. Raw pointer issues - cpwiki

    And of course, unless you have a very good reason, don't use C file I/O.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  5. #5
    Registered User
    Join Date
    Mar 2011
    thanks for your reply

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