Subject: Re: Need help with c!
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From: "Douglas A. Gwyn" <gwyn AT arl DOT mil>
Organization: US Army Research Laboratory (ISTD/CNSD)
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Date: Thu, 28 Jan 1999 20:17:00 GMT
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To: djgpp AT delorie DOT com
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Marp wrote:
> Get rid of the word static in front of FILE *fptr because that should be
> able to change as you work with the file. If it can't change it won't work
> properly.

That's nonsense.  "static" != "const"

> Mohanaraj Gopala Krishnan wrote in message ...
> >        if((fptr=fopen("chapter.dat", "r")) !=NULL) ...
> >        else if((fptr=fopen("chapter.dat","w+b")) !=NULL) ...
> >        else {
> >             printf("Cannot open or start new chapter!!!");
> >             exit(1);
> >             }
> >The problem is with the first open and read only line. If there is no
> >chapter.dat file in the program it is okay, but once the chapter.dat
> >file already exists, the program quits straight away.

I don't know what operating system you're using, but it is inconsistent
to write a file as a binary stream then try to read it as a text stream.

> >void
> >main()
> >{

That's wrong; main returns an int.

> >void read_page(char * strpointer)
> >{
> >        FILE *page_write;
> >        PAGE page;
> >
> >        page_write=fopen("chapter.dat","r");
> >        if(page_write==NULL)
> >        {
> >                puts("No chapter found!!");
> >                return;
> >        }
> >
> >        fread(strpointer,sizeof(page),1,page_write);
> >}

The above function loses the FILE* handle without first closing
the open stream.  It is also a serious error to try to use a
character string instead of an open FILE* for the first argument
to fread().

There are probably other problems, but in general I didn't see
a clear model that your I/O functions were implementing.
-- 
comp.lang.c.moderated - clcm AT plethora DOT net