我创建了一个Server类和一个Session类。以下是我的Server类的函数：
void Server::startAccept(){
std::shared_ptr<Session> newConnection =
Session::create(m_acceptor.get_io_service());
//m_acceptor is a member variable of the `Server` class
m_acceptor.async_accept(newConnection->getSocket(),
std::bind(&Server::acceptHandler, this, newConnection,
placeholders::error));
}
以及接受连接时的处理函数：
void Server::acceptHandler(std::shared_ptr<Session> newConnection, const boost::system::error_code& error){
if (!error)
{
std::cout << "A client connected" << std::endl;
newConnection->start(); // start() is a function of Session Class
}
startAccept();
}
但是在编译时我收到错误：
../src/Server.cpp: In member function ‘void Server::startAccept()’:
../src/Server.cpp:26:85: error: no matching function for call to ‘boost::asio::basic_socket_acceptor<boost::asio::ip::tcp>::async_accept(boost::asio::ip::tcp&, std::_Bind_helper<false, void (Server::*)(std::shared_ptr<Session>, const boost::system::error_code&), Server*, std::shared_ptr<Session>&, boost::arg<1> (&)()>::type)’
std::bind(&Server::acceptHandler, this, newConnection, placeholders::error));
^
In file included from /usr/include/boost/asio.hpp:28:0,
from ../src/Server.h:16,
from ../src/Server.cpp:8:
/usr/include/boost/asio/basic_socket_acceptor.hpp:1009:3: note: candidate: template<class Protocol1, class SocketService, class AcceptHandler> typename boost::asio::async_result<typename boost::asio::handler_type<AcceptHandler, void(boost::system::error_code)>::type>::type boost::asio::basic_socket_acceptor<Protocol, SocketAcceptorService>::async_accept(boost::asio::basic_socket<Protocol1, SocketService1>&, AcceptHandler&&, typename std::enable_if<std::is_convertible<Protocol, Protocol1>::value>::type*) [with Protocol1 = Protocol1; SocketService = SocketService; AcceptHandler = AcceptHandler; Protocol = boost::asio::ip::tcp; SocketAcceptorService = boost::asio::socket_acceptor_service<boost::asio::ip::tcp>]
async_accept(basic_socket<Protocol1, SocketService>& peer,
^
/usr/include/boost/asio/basic_socket_acceptor.hpp:1009:3: note: template argument deduction/substitution failed:
../src/Server.cpp:26:85: note: ‘boost::asio::ip::tcp’ is not derived from ‘boost::asio::basic_socket<Protocol, DatagramSocketService>’
std::bind(&Server::acceptHandler, this, newConnection, placeholders::error));
^
In file included from /usr/include/boost/asio.hpp:28:0,
from ../src/Server.h:16,
from ../src/Server.cpp:8:
/usr/include/boost/asio/basic_socket_acceptor.hpp:1121:3: note: candidate: template<class SocketService, class AcceptHandler> typename boost::asio::async_result<typename boost::asio::handler_type<AcceptHandler, void(boost::system::error_code)>::type>::type boost::asio::basic_socket_acceptor<Protocol, SocketAcceptorService>::async_accept(boost::asio::basic_socket<Protocol, SocketService>&, boost::asio::basic_socket_acceptor<Protocol, SocketAcceptorService>::endpoint_type&, AcceptHandler&&) [with SocketService = SocketService; AcceptHandler = AcceptHandler; Protocol = boost::asio::ip::tcp; SocketAcceptorService = boost::asio::socket_acceptor_service<boost::asio::ip::tcp>]
async_accept(basic_socket<protocol_type, SocketService>& peer,
^
/usr/include/boost/asio/basic_socket_acceptor.hpp:1121:3: note: template argument deduction/substitution failed:
../src/Server.cpp:26:85: note: ‘boost::asio::ip::tcp’ is not derived from ‘boost::asio::basic_socket<boost::asio::ip::tcp, SocketService>’
std::bind(&Server::acceptHandler, this, newConnection, placeholders::error));
有人可以告诉我这里缺少什么吗？
我正在添加所有文件以供参考：
Server.h
#ifndef SERVER_H_
#define SERVER_H_
#include <iostream>
#include <string>
#include<functional>
#include<memory>
#include <boost/asio.hpp>
#include "Session.h"
using namespace boost::asio;
class Server {
ip::tcp::acceptor m_acceptor;
io_service m_ioService;
public:
Server(int port);
void startAccept(); //calls acceptHandler() on accepting the connection from client
void acceptHandler(std::shared_ptr<Session> newConnection, const boost::system::error_code& error);
virtual ~Server();
};
#endif /* SERVER_H_ */
Server.cpp
#include "Server.h"
Server::Server(int port): m_acceptor(m_ioService, ip::tcp::endpoint(ip::tcp::v4(), port)){
startAccept();
}
Server::~Server() { }
void Server::startAccept(){
//std::shared_ptr<session> newConnection = std::make_shared<session> (session(m_acceptor.get_io_service()));
std::shared_ptr<Session> newConnection = Session::create(m_acceptor.get_io_service());
m_acceptor.async_accept(newConnection->getSocket(),
std::bind(&Server::acceptHandler, this, newConnection, placeholders::error));
}
void Server::acceptHandler(std::shared_ptr<Session> newConnection, const boost::system::error_code& error){
if (!error)
{
std::cout << "A client connected" << std::endl;
newConnection->start(); //starts this function when a new connection is accepted
}
startAccept();
}
Session.h
#ifndef SESSION_H_
#define SESSION_H_
#include <iostream>
#include <string>
#include<functional>
#include<memory>
#include <boost/asio.hpp>
using namespace boost::asio;
class Session : public std::enable_shared_from_this<Session>{
ip::tcp::socket m_socket;
std::string m_acceptMessage;
std::string m_buffer;
public:
Session(io_service &ioService);
virtual ~Session();
static std::shared_ptr<Session> create(io_service& ioService);
void start(); //this function is called from server acceptHandler when a connection is accepted by server
void readHandler(const boost::system::error_code& error, size_t bytesTransferred); //called in async_read()
void writeHandler(const boost::system::error_code& error, size_t bytesTransferred); //called in async_write()
ip::tcp& getSocket();
void receiveMessage();
void sendMessage(const std::string& message);
};
#endif /* SESSION_H_ */
Session.cpp
#include "Session.h"
Session::Session(io_service& ioService): m_socket(ioService) { }
Session::~Session() { }
std::shared_ptr<Session> Session::create(io_service& ioService){
return std::shared_ptr<Session>(new Session(ioService));
}
void Session::start(){
//read from client connection
receiveMessage();
//write to client connection
sendMessage("dummy message");
}
void Session::readHandler(const boost::system::error_code& error, size_t bytesTransferred) {
//do something on reading from the client
std::cout<<"[server] read something from client"<<std::endl;
}
void Session::writeHandler(const boost::system::error_code& error, size_t bytesTransferred) {
//do something on write
std::cout<<"[server] written something from the client"<<std::endl;
}
void Session::receiveMessage() {
async_read(m_socket, buffer(m_acceptMessage), std::bind(&Session::readHandler, std::shared_from_this(),
placeholders::error, placeholders::bytes_transferred));
}
void Session::sendMessage(const std::string& message) {
async_write(m_socket, buffer(message), std::bind(&Session::writeHandler, std::shared_from_this()),
placeholders::error, placeholders::bytes_transferred);
}
ip::tcp& Session::getSocket(){
return m_socket;
}