As per, http://www.devx.com/tips/Tip/14544
The following example imitates the ios::nocreate flag. First, it
attempts to open a file for read. If the file doesn't exist, no new
file is created. If the file exists, the program closes it and reopens
it in write mode:
fstream fs("fname", ios_base::in);// attempt open for read
if (!fs)
{
// file doesn't exist; don't create a new one
}
else //ok, file exists. close and reopen in write mode
{
fs.close();
fs.open("fname", ios_base::out); // reopen for write
}
You can just do the opposite for ios::noreplace:
fstream fs("fname", ios_base::in);// attempt open for read
if (!fs)
{
// file doesn't exist; create a new one
fs.open("fname", ios_base::out);
}
else //ok, file exists; close and reopen in write mode
{
fs.close()
fs.open("fname", ios_base::out); // reopen for write
}
On Tue, 22 Jun 2004 09:53:49 -0600, Noorez Kassam
<coo...@ho...> wrote:
>
> I tried including the old iostream.h file but it still didn't work. Can you
> give me a sample code for this?
>
> From: Jesse Hallam <jes...@gm...>
> To: Noorez Kassam <coo...@ho...>
> CC: dev...@li...
> Subject: Re: [Dev-C++] File handle
> Date: Mon, 21 Jun 2004 20:31:06 -0400
>
>
>
> As per,
>
> http://www.flipcode.com/cgi-bin/msg.cgi?showThread=00003660&forum=general&id=-1
>
> ios::nocreate is only implemented in the old C++ runtime library --
> <iostream.h>, rather than <iostream>.
>
> There's a detailed list of implementation differences here:
>
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_core_differences_in_iostream_implementation.asp
>
> (I presume this is the same situation with ios::noreplace)
>
> Cheerio!
>
> On Mon, 21 Jun 2004 17:05:52 -0600, Noorez Kassam
> <coo...@ho...> wrote:
> >
> > I am having trouble doing file handling.
> >
> > when opening the file i can use all the opening techinques except
> > ios::nocreate and ios::noreplace.
> > All the other ones work fine but when i try to use those i get a compile
> > error.
> >
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>
> --
> Jesse Hallam
> University of Waterloo Freshman
>
> _________________________________________________________________
>
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>
--
Jesse Hallam
University of Waterloo Freshman
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