read a structure from a file

This is a discussion on read a structure from a file within the C Programming forums, part of the General Programming Boards category; i have the following structure: Code: typedef struct fagure { int celule[50]; char tip; int regine[300]; } fagure; and i ...

  1. #1
    Registered User
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    Dec 2005
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    167

    read a structure from a file

    i have the following structure:

    Code:
    typedef struct fagure
    {
            int celule[50];
            char tip;
            int regine[300];
    } fagure;
    and i have a file with the structure

    [aray of int] [char (C or R character)] [aray of int]
    ... many lines

    what would be a smart way to read it ?

    i've done something like this:
    Code:
            fagure temp;
            char a;
            int n=0,m=0;
            temp.tip=0;
            while((fscanf(f,"%c",&a))!=EOF)
            {
                    if((a!=' ')&&(a!='\n'))
                    {
                            if((a=='C')||(a=='R')) temp.tip=a;
                            if(temp.tip==0) temp.celule[n++]=a-'0';
                            if((temp.tip!=0)&&(a!='C')&&(a!='R')) temp.regine[m++]=a-'0';
                    }
                    if(a=='\n')
                    {
                            generare(temp,n,m);
                            temp.tip=0;
                            n=0;
                            m=0;
                    }
            }
            generare(temp,n,m);
    where generare(temp,n,m) is the print function.
    The only problem with this sort of read is that if i have a two digit number it separes it in do numers of one digit.

    Pls help!

    Thank you!

  2. #2
    Registered User ssharish2005's Avatar
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    Cambridge, UK
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    1,682
    used fread() fucntion to read a one whole record from the file. to do this u need to open the file in binary mode and work on it. when ever u read a data from a file u are reading in terms of one whole record rather than char or a sinle word or a line. fwrite fucntion to write back to the binary file.

    ssharish2005

  3. #3
    Frequently Quite Prolix dwks's Avatar
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    fwrite() and fread() don't generally work between computers that have different byte alignment, edianness, or ordering of structure members.

    You would be better off use fprintf()/fscanf() or putc()/getc() or something if you want the files to be cross-platform compatible.
    dwk

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