ios::binary

ios::binary

[Thomas Matelich]

So, binary file IO is unsupported?  Or am I mistaken?

--
Thomas O Matelich
Senior Programmer
Zetec, Inc.
tmatelich@zetec.com
tomsara@slip-stream.net

Re: ios::binary

[rich_paul]

Under unix, binary file IO is always the case.  Note that in the iostreams
library, binary means the same thing it means in ftp ... do not convert
line ends.  therefore:

{
  int i = 32;
  ofstream str("tempfile");
  str << i << endl;
}
{
  char ch;
  ifstream str("tempfile");
  str >> ch;
  cout << ch << endl;
}

will output the number 3, not a space, regardless of the binary flag.

--------
Where do you want to crash, toady?
On Tue, 3 Nov 1998, Thomas Matelich wrote:

> So, binary file IO is unsupported?  Or am I mistaken?
> 
> --
> Thomas O Matelich
> Senior Programmer
> Zetec, Inc.
> tmatelich@zetec.com
> tomsara@slip-stream.net
> 
> 
> 
> 

Re: ios::binary

[Tom and Sara and Emma]

I want to be able to write out binary data not character, like fwrite does, or
is that not the purpose of ios::binary?  ie, 4 bytes for a int, etc.

rich_paul@bigfoot.com wrote:

> Under unix, binary file IO is always the case.  Note that in the iostreams
> library, binary means the same thing it means in ftp ... do not convert
> line ends.  therefore:
>
> {
>   int i = 32;
>   ofstream str("tempfile");
>   str << i << endl;
> }
> {
>   char ch;
>   ifstream str("tempfile");
>   str >> ch;
>   cout << ch << endl;
> }
>
> will output the number 3, not a space, regardless of the binary flag.
>
> --------
> Where do you want to crash, toady?
> On Tue, 3 Nov 1998, Thomas Matelich wrote:
>
> > So, binary file IO is unsupported?  Or am I mistaken?
> >
> > --
> > Thomas O Matelich
> > Senior Programmer
> > Zetec, Inc.
> > tmatelich@zetec.com
> > tomsara@slip-stream.net
> >
> >
> >
> >

Re: ios::binary

[Joe Buck]

> I want to be able to write out binary data not character, like fwrite does, or
> is that not the purpose of ios::binary?  ie, 4 bytes for a int, etc.

No.  ios::binary puts the stream in binary mode on Windows or the Mac,
but even on those systems, with streams set to ios::binary, the
statements

	double v = 2.25;
	cout << v;

will still print characters.  (Things like end-of-line will change
behavior though).

The write method will write raw binary data to the stream, and is
analogous to fwrite.