矢量：0000005：在AccountServer.exe 0x00066314未處理的異常訪問衝突讀取位置0xccccccd0

Question

class Connection 
{ 
public: 
    explicit Connection(boost::asio::io_service& io_service); 
    virtual ~Connection(); 
    boost::asio::ip::tcp::socket& socket(); 

    virtual void OnConnected()=0; 
    void Send(uint8_t* buffer, int length); 
    bool Receive(); 
private: 
    void handler(const boost::system::error_code& error, std::size_t bytes_transferred); 
    boost::asio::ip::tcp::socket socket_; 
}; 
----------------------------------------------------------------------------------- 
Server::Server(boost::asio::io_service& io_service,short port) 
    : acceptor_(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)){ 
     m_connections = new std::vector<Connection*>();   
     start_accept(); 


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

Server::~Server() 
{ 
    m_connections->clear(); 
    delete m_connections; 
} 

void Server::start_accept(){ 

    /* Connection::pointer new_connection = 
     Connection::create(acceptor_.io_service());*/ 

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

} 

它構建沒有錯誤的項目，但是當我試圖運行它的中斷程序，並給了我這個錯誤

Unhandled exception at 0x00066314 in AccountServer.exe: 0xC0000005: Access violation reading location 0xccccccd0. 

這裏有什麼問題？

Answer 1

此行

m_connections = new std::vector<Connection*>(); 

創建指針的向量。指針何時起作用？

在這裏，他們被假定爲指向一個socket()

acceptor_.async_accept(m_connections->front()->socket(), 

Answer 2

假設的Visual C++在這裏，我想this question可能與成才;您正在嘗試取消引用堆棧上未初始化的指針。

具體而言，在初始化指向矢量的指針之前，您正在調用start_accept（）顯然，你的服務器對象居住在堆棧上，並且要訪問的向量結構中的第一個字段的偏移量爲4.