升壓async_accept導致「訪問衝突」 - 錯誤

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(); 
    } 
    } 

當我運行該項目，我獲得以下錯誤：

Access violation reading location 0xfeeeff02.

什麼是這個錯誤的原因是什麼？

Answer 1

你的io_service超出了範圍start_accept()，這是不好的，可能不是你想要的。

改變這種

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)); 

} 

這個

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)); 

} 

雖然，因爲您的意見建議，你真的應該張貼問題的一個自包含的例子。以上建議是我最好的猜測。