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Added comedi::istream and ostream classes, to provide slightly higher

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level ostream::write() and istream::read() functions for transferring
data during commands.
This commit is contained in:
Frank Mori Hess 2007-10-12 21:24:11 +00:00
parent bdbd1ab792
commit b6144ac99b
1 changed files with 72 additions and 0 deletions
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c++/include/comedi_iostream.hpp Normal file
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/*
Input and output stream classes for comedilib's C++ binding.
The << and >> operators are NOT useful, as the overloaded bitshift
operators are used for formatting. Instead use the unformatted read() and
write() member functions.
Copyright (C) 2007 Frank Mori Hess <fmhess@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _COMEDILIB_IOSTREAM_HPP
#define _COMEDILIB_IOSTREAM_HPP
#include <comedilib.hpp>
#include <cstdio>
#include <ext/stdio_filebuf.h>
#include <iostream>
#include <unistd.h>
namespace comedi
{
namespace detail
{
class filebuf
{
public:
filebuf(const comedi::device &dev, std::ios::openmode mode, size_t buffer_size)
{
int fd = dup(dev.fileno());
if(fd < 0)
{
throw std::invalid_argument(__PRETTY_FUNCTION__);
}
m_filebuf.reset(new __gnu_cxx::stdio_filebuf<char>(fd, mode, buffer_size));
}
boost::scoped_ptr<__gnu_cxx::stdio_filebuf<char> > m_filebuf;
};
}
class istream: private detail::filebuf, public std::istream
{
public:
istream(const comedi::device &dev, size_t buffer_size = static_cast<size_t>(BUFSIZ)):
detail::filebuf(dev, std::ios::in | std::ios::binary, buffer_size),
std::istream(this->m_filebuf.get())
{}
};
class ostream: private detail::filebuf, public std::ostream
{
public:
ostream(const comedi::device &dev, size_t buffer_size = static_cast<size_t>(BUFSIZ)):
detail::filebuf(dev, std::ios::out | std::ios::binary, buffer_size),
std::ostream(this->m_filebuf.get())
{}
};
};
#endif // _COMEDILIB_IOSTREAM_HPP