Re: [Boost-users] [asio][serialization] read_until end of archive, which delimiter

18 Oct 2006

      Christian Rössel wrote:
...
Dear all,
I want to receive a boost::archive::text_iarchive using the
boost::asio::read_until () function.
boost::asio::streambuf response;
 boost::asio::read_until(socket, response, boost::regex("\r\n"));
 std::istream responseStream(&response);
 boost::archive::text_iarchive responseArchive (responseStream);
 responseArchive >> retVal;
The data is sent using code linke this:
boost::asio::streambuf response;
 std::ostream commandStream (&response);
 boost::archive::text_oarchive responseArchive (commandStream);
 const ReturnValue retVal (42);
 responseArchive << retVal;
 boost::asio::write(socket, response);
If I use boost::regex("\r\n") or a character that does not occur in
the sent archive, read_until throws an eof exception. If I use a
delimiter that is contained in the archive, read_until succeeds and
the streambuf does contain the entire archive, not only up to the
delimiter.
What is the correct way to read the entire archive without throwing an
exception?
I think the "correct way is to be sure the archive is destroyed before 
sending.
This should append a /n at the end - (at least in 1.34 - this might be a 
problem
with previous versions - or maybe not.) So the above would look like:

boost::asio::streambuf response;
std::ostream commandStream (&response);
{
    boost::archive::text_oarchive responseArchive (commandStream);
    const ReturnValue retVal (42);
    responseArchive << retVal;
} // archive closed appends /n at this point.
boost::asio::write(socket, response);

or you could just append a \n to commandStream
...
Thanks and regards,
Christian

Re: [Boost-users] [asio][serialization] read_until end of archive, which delimiter

Robert Ramey