[Boost-users] Asio problems with async_read

Hi I have a funciton where we I am using boost::asio to read from the serial port of my computer. I have started out with an implementation which uses read, and I am now trying to convert it to async_read because I want a time out. When I am trying to use the async_read version, I get timeouts after I have read one or two charterers, even though I know there are more charterers to be read on the wire. Here is the code: void set_result( boost::optionalboost::system::error_code * a, boost::system::error_code b ) { a->reset( b ); } std::vector receive(boost::asio::io_service & io, boost::asio::serial_port & cctalk_port){ #if 0 boost::optionalboost::system::error_code timer_result; boost::optionalboost::system::error_code read_result; boost::asio::deadline_timer timer( io ); timer.expires_from_now( boost::posix_time::milliseconds(5000) ); timer.async_wait( boost::bind(&set_result, &timer_result, _1) ); boost::asio::streambuf result; boost::asio::async_read( cctalk_port, result, boost::asio::transfer_at_least(1), boost::bind( &set_result, &read_result, _1 )); while(1) { io.poll_one(); if ( read_result ) { timer.cancel(); std::vector res(boost::asio::buffer_cast(result.data()), boost::asio::buffer_cast

(result.data()) + result.size() );

return res; } else if ( timer_result ) { throw runtime_error("timeout"); } } throw runtime_error("Should not happend"); #else uint8_t c; boost::asio::read(cctalk_port, boost::asio::buffer(&c, 1)); std::vector res; res.push_back(c); return res; #endif }