From: cs3prj04 AT lion DOT cs DOT latrobe DOT edu DOT au (Cs3prj Group 04)
Newsgroups: comp.lang.c,comp.lang.c++,comp.os.msdos.djgpp
Subject: Can not reset an open ifstream file.
Date: 19 Sep 1996 06:10:12 GMT
Organization: Comp.Sci & Comp.Eng, La Trobe Uni, Australia
Lines: 40
Distribution: world
Message-ID: <51qo44$e2@lion.cs.latrobe.edu.au>
NNTP-Posting-Host: lion.cs.latrobe.edu.au
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

After running the below program I would be perfectly justified in saying
that the fools who designed the iostream/fstream classes have provided no
means of reseting an open file so that it can be read again.

With the do while loop commented out  seekg works as you would expect it to
and you see, on the screen, the first line of the file printed out twice.

However with the do while loop uncommented the call to seekg fails under all
circumstances and you see the first line of the file printed only once.

Can any body show me that I am wrong.
#include <fstream.h>
#include <iostream.h>
#include "string.hpp"

void main()
{
  //fstream In("main.cpp",ios::in|ios::out);
  ifstream In("main.cpp");
  StringC Line;
  In>>Line;
  cout<<Line<<endl;
  do
  {
    In>>Line;
  }
  while (!In.eof());
  In.seekg(0);
  In>>Line;
  cout<<Line<<endl;
  In.close();
}
Newsgroups: comp.lang.c,comp.lang.c++,comp.os.msdos.djgpp
Subject: Cannot reset an open ifstream file.
Summary: 
Followup-To: 
Distribution: world
Organization: Comp.Sci & Comp.Eng, La Trobe Uni, Australia
Keywords: