Re: [Dev-C++] File handle

[Jesse H. <jes...@gm...>]

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