| // |
| // win_iocp_serial_port_service.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP |
| #define BOOST_ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| #include <cstring> |
| #include <string> |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #include <boost/asio/detail/win_iocp_io_service_fwd.hpp> |
| |
| #if defined(BOOST_ASIO_HAS_IOCP) |
| |
| #include <boost/asio/error.hpp> |
| #include <boost/asio/io_service.hpp> |
| #include <boost/asio/detail/win_iocp_handle_service.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| // Extend win_iocp_handle_service to provide serial port support. |
| class win_iocp_serial_port_service |
| : public boost::asio::detail::service_base<win_iocp_serial_port_service> |
| { |
| public: |
| // The native type of a stream handle. |
| typedef win_iocp_handle_service::native_type native_type; |
| |
| // The implementation type of the stream handle. |
| typedef win_iocp_handle_service::implementation_type implementation_type; |
| |
| win_iocp_serial_port_service(boost::asio::io_service& io_service) |
| : boost::asio::detail::service_base< |
| win_iocp_serial_port_service>(io_service), |
| handle_service_( |
| boost::asio::use_service<win_iocp_handle_service>(io_service)) |
| { |
| } |
| |
| // Destroy all user-defined handler objects owned by the service. |
| void shutdown_service() |
| { |
| } |
| |
| // Construct a new handle implementation. |
| void construct(implementation_type& impl) |
| { |
| handle_service_.construct(impl); |
| } |
| |
| // Destroy a handle implementation. |
| void destroy(implementation_type& impl) |
| { |
| handle_service_.destroy(impl); |
| } |
| |
| // Open the serial port using the specified device name. |
| boost::system::error_code open(implementation_type& impl, |
| const std::string& device, boost::system::error_code& ec) |
| { |
| if (is_open(impl)) |
| { |
| ec = boost::asio::error::already_open; |
| return ec; |
| } |
| |
| // For convenience, add a leading \\.\ sequence if not already present. |
| std::string name = (device[0] == '\\') ? device : "\\\\.\\" + device; |
| |
| // Open a handle to the serial port. |
| ::HANDLE handle = ::CreateFileA(name.c_str(), |
| GENERIC_READ | GENERIC_WRITE, 0, 0, |
| OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); |
| if (handle == INVALID_HANDLE_VALUE) |
| { |
| DWORD last_error = ::GetLastError(); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| // Determine the initial serial port parameters. |
| using namespace std; // For memcpy. |
| ::DCB dcb; |
| memset(&dcb, 0, sizeof(DCB)); |
| dcb.DCBlength = sizeof(DCB); |
| if (!::GetCommState(handle, &dcb)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ::CloseHandle(handle); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| // Set some default serial port parameters. This implementation does not |
| // support changing these, so they might as well be in a known state. |
| dcb.fBinary = TRUE; // Win32 only supports binary mode. |
| dcb.fDsrSensitivity = FALSE; |
| dcb.fNull = FALSE; // Do not ignore NULL characters. |
| dcb.fAbortOnError = FALSE; // Ignore serial framing errors. |
| if (!::SetCommState(handle, &dcb)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ::CloseHandle(handle); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| // Set up timeouts so that the serial port will behave similarly to a |
| // network socket. Reads wait for at least one byte, then return with |
| // whatever they have. Writes return once everything is out the door. |
| ::COMMTIMEOUTS timeouts; |
| timeouts.ReadIntervalTimeout = 1; |
| timeouts.ReadTotalTimeoutMultiplier = 0; |
| timeouts.ReadTotalTimeoutConstant = 0; |
| timeouts.WriteTotalTimeoutMultiplier = 0; |
| timeouts.WriteTotalTimeoutConstant = 0; |
| if (!::SetCommTimeouts(handle, &timeouts)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ::CloseHandle(handle); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| // We're done. Take ownership of the serial port handle. |
| if (handle_service_.assign(impl, handle, ec)) |
| ::CloseHandle(handle); |
| return ec; |
| } |
| |
| // Assign a native handle to a handle implementation. |
| boost::system::error_code assign(implementation_type& impl, |
| const native_type& native_handle, boost::system::error_code& ec) |
| { |
| return handle_service_.assign(impl, native_handle, ec); |
| } |
| |
| // Determine whether the handle is open. |
| bool is_open(const implementation_type& impl) const |
| { |
| return handle_service_.is_open(impl); |
| } |
| |
| // Destroy a handle implementation. |
| boost::system::error_code close(implementation_type& impl, |
| boost::system::error_code& ec) |
| { |
| return handle_service_.close(impl, ec); |
| } |
| |
| // Get the native handle representation. |
| native_type native(implementation_type& impl) |
| { |
| return handle_service_.native(impl); |
| } |
| |
| // Cancel all operations associated with the handle. |
| boost::system::error_code cancel(implementation_type& impl, |
| boost::system::error_code& ec) |
| { |
| return handle_service_.cancel(impl, ec); |
| } |
| |
| // Set an option on the serial port. |
| template <typename SettableSerialPortOption> |
| boost::system::error_code set_option(implementation_type& impl, |
| const SettableSerialPortOption& option, boost::system::error_code& ec) |
| { |
| using namespace std; // For memcpy. |
| |
| ::DCB dcb; |
| memset(&dcb, 0, sizeof(DCB)); |
| dcb.DCBlength = sizeof(DCB); |
| if (!::GetCommState(handle_service_.native(impl), &dcb)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| if (option.store(dcb, ec)) |
| return ec; |
| |
| if (!::SetCommState(handle_service_.native(impl), &dcb)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| ec = boost::system::error_code(); |
| return ec; |
| } |
| |
| // Get an option from the serial port. |
| template <typename GettableSerialPortOption> |
| boost::system::error_code get_option(const implementation_type& impl, |
| GettableSerialPortOption& option, boost::system::error_code& ec) const |
| { |
| using namespace std; // For memcpy. |
| |
| ::DCB dcb; |
| memset(&dcb, 0, sizeof(DCB)); |
| dcb.DCBlength = sizeof(DCB); |
| if (!::GetCommState(handle_service_.native(impl), &dcb)) |
| { |
| DWORD last_error = ::GetLastError(); |
| ec = boost::system::error_code(last_error, |
| boost::asio::error::get_system_category()); |
| return ec; |
| } |
| |
| return option.load(dcb, ec); |
| } |
| |
| // Send a break sequence to the serial port. |
| boost::system::error_code send_break(implementation_type&, |
| boost::system::error_code& ec) |
| { |
| ec = boost::asio::error::operation_not_supported; |
| return ec; |
| } |
| |
| // Write the given data. Returns the number of bytes sent. |
| template <typename ConstBufferSequence> |
| size_t write_some(implementation_type& impl, |
| const ConstBufferSequence& buffers, boost::system::error_code& ec) |
| { |
| return handle_service_.write_some(impl, buffers, ec); |
| } |
| |
| // Start an asynchronous write. The data being written must be valid for the |
| // lifetime of the asynchronous operation. |
| template <typename ConstBufferSequence, typename Handler> |
| void async_write_some(implementation_type& impl, |
| const ConstBufferSequence& buffers, Handler handler) |
| { |
| handle_service_.async_write_some(impl, buffers, handler); |
| } |
| |
| // Read some data. Returns the number of bytes received. |
| template <typename MutableBufferSequence> |
| size_t read_some(implementation_type& impl, |
| const MutableBufferSequence& buffers, boost::system::error_code& ec) |
| { |
| return handle_service_.read_some(impl, buffers, ec); |
| } |
| |
| // Start an asynchronous read. The buffer for the data being received must be |
| // valid for the lifetime of the asynchronous operation. |
| template <typename MutableBufferSequence, typename Handler> |
| void async_read_some(implementation_type& impl, |
| const MutableBufferSequence& buffers, Handler handler) |
| { |
| handle_service_.async_read_some(impl, buffers, handler); |
| } |
| |
| private: |
| // The handle service used for initiating asynchronous operations. |
| win_iocp_handle_service& handle_service_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #endif // defined(BOOST_ASIO_HAS_IOCP) |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP |