Re: cin and binary mode

From:
"Tom Widmer [VC++ MVP]" <tom_usenet@hotmail.com>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 25 Sep 2006 12:43:08 +0100
Message-ID:
<uYyFGfJ4GHA.324@TK2MSFTNGP05.phx.gbl>
manimau wrote:

Is there any chance of slightest light at the end of the tunnel in pursuing
the cin and binary mode operation together?

I am trying to see if I can open the cin in binary mode for read operation.
I am using VC++ with VS .NET 2003

While using VS 6.0, it was a piece of cake, but since there were a lot of
things just removed in VC++ .NET 2003 version, I am having a hard time
converting this little piece of code....

previously with VS 6.0 it was,

istream_withassign myFile;
filebuf *myFileBuf;
.......
myFileBuf = new filebuf (_fileno(stdin));
myFileBuf->setmode(filebuf::binary);
myFile = myFileBuf; // stream object is stream buffer

if (!(myFile.read(data, nBytes)))
{
        if (myFile.eof())
        {
            status = M_EndOfFile;
        }
        else
.....
}
 
Which worked just fine.

Any ideas or hopes of converting it to VC++ .net 2003?


This should work on 2003 and 2005 (and probably VC6 as well):

#include <iostream>
#include <stdio.h>
#include <io.h>
#include <fcntl.h>

//...
_setmode(_fileno(stdin), _O_BINARY);
std::istream is(std::cin.rdbuf());
//or std::istream& is = std::cin;

_setmode is MS's version of the POSIX function setmode, so this solution
should port to UNIX simply by removing the start _s.

Tom

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