c++ - vector :AccountServer.exe 中 0x00066314 处的未处理异常:0xC0000005:访问冲突读取位置 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));

}

它构建的项目没有错误，但是当我尝试运行程序时它中断并给我这个错误

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

这是怎么回事？!

Answer 1

假设此处使用 Visual C++，我认为 this question可能相关；您正在尝试取消引用堆栈上未初始化的指针。

具体来说，您在初始化指向 vector 的指针之前调用 start_accept()；显然，您的 Server 对象存在于堆栈中，并且要访问的 vector 结构中的第一个字段存在于偏移量 4 处。