Boost async_accept 会导致“访问冲突” - 错误

Question

Server::Server(boost::asio::io_service& io_service,std::string ip,short port,std::shared_ptr<ConnectionFactory> factory)
    : acceptor_(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::address_v4::from_string(ip.data()), port)){

        m_factory = factory;
        start_accept();

        std::cout<<"Socket accepting connections..."<<std::endl;
}

void Server::start_accept(){
    boost::asio::io_service io_service;
    std::shared_ptr<Connection> conn = m_factory->create(io_service);

    acceptor_.async_accept(conn->socket(),
        boost::bind(&Server::handle_accept, this,conn,
          boost::asio::placeholders::error));

}


void Server::handle_accept(std::shared_ptr<Connection> conn,const boost::system::error_code& error){

    if (!error)
    {
        std::cout<<"on connected"<<std::endl;
        conn->OnConnected();
        start_accept();
    }
  }

当我运行该项目时，出现以下错误：

访问冲突读取位置 0xfeeeff02。

此错误的原因是什么？

Answer 1

您的 io_service 超出了 start_accept() 的范围，这不好，而且可能不是您想要的。

将此更改

Server::Server( ... ) {
        m_factory = factory;
        start_accept();

        std::cout<<"Socket accepting connections..."<<std::endl;
}

void Server::start_accept() {
    boost::asio::io_service io_service;
                        ^^^^^^^^^
    std::shared_ptr<Connection> conn = m_factory->create(io_service);

    acceptor_.async_accept(conn->socket(),
        boost::bind(&Server::handle_accept, this,conn,
          boost::asio::placeholders::error));

}

为此

Server::Server( ... ) {   
        m_factory = factory;
        start_accept( io_service );
                      ^^^^^^^^^

        std::cout<<"Socket accepting connections..."<<std::endl;
}

void Server::start_accept( const boost::asio::io_service& io_service ){
    std::shared_ptr<Connection> conn = m_factory->create(io_service);

    acceptor_.async_accept(conn->socket(),
        boost::bind(&Server::handle_accept, this,conn,
          boost::asio::placeholders::error));

}

尽管，正如您的评论所建议的，您确实应该发布一个独立的问题示例。上述建议是我最好的猜测。