7

出于某种原因,这会导致访问冲突,但是没有任何详细的文档/帮助我不确定我在哪里做错了。由于按照我在 boost 站点上看到的内容,这应该是正确的,并将客户端的每个 asio::write 调用的内容打印到新行。客户端似乎工作正常。虽然此时服务器崩溃了,但它还没有发送任何东西。

访问冲突发生在第 275 行的 basic_stream_socket.hpp 中。原因似乎是对象 (boost::asio::stream_socket_service) 未初始化(this 指针的值为 0xfeeefeee),但我不明白为什么不是。

程序输出:

启动服务器
Server::startAccept()
Server::handleAccept()
连接已接受
Connection::startRead()
Server::startAccept()
Connection::handleRead()
读取错误: I/O 操作已中止,因为线程退出或应用程序请求
Connection::startRead()

编码

#include "precompiled.h"
#include "db.h"
class Connection
    : public boost::enable_shared_from_this<Connection>
{
public:
    typedef boost::shared_ptr<Connection> Pointer;

    static Pointer create(boost::asio::io_service& ioService)
    {
        return Pointer(new Connection(ioService));
    }

    ip::tcp::socket& getSocket()
    {
        return socket;
    }

    void startRead()
    {
        std::cout << "Connection::startRead()" << std::endl;
        socket.async_read_some(boost::asio::buffer(readBuffer),
            boost::bind(&Connection::handleRead,this,_1,_2));
    }
private:
    Connection(asio::io_service& ioService)
        : socket(ioService)
    {
    }

    void handleWrite(const boost::system::error_code&,size_t)
    {
    }
    void handleRead(const boost::system::error_code&error,size_t len)
    {
        std::cout << "Connection::handleRead()" << std::endl;
        if(error)
        {
            std::cout << "READ ERROR: ";
            std::cout << boost::system::system_error(error).what();
            std::cout << std::endl;
        }
        else
        {
            std::cout << "read: ";
            std::cout.write(readBuffer.data(),len);
            std::cout << std::endl;
        }
        startRead();
    }
    boost::array<char, 256> readBuffer;
    ip::tcp::socket socket;
};

class Server
{
public:
    Server(asio::io_service& ioService)
        :acceptor(ioService, ip::tcp::endpoint(ip::tcp::v4(), getPort()))
    {
        startAccept();
    }
private:
    void startAccept()
    {
        std::cout << "RServer::startAccept()" << std::endl;
        Connection::Pointer newConn =
            Connection::create(acceptor.io_service());

        acceptor.async_accept(newConn->getSocket(),
            boost::bind(&Server::handleAccept, this, newConn,
            asio::placeholders::error));
    }
    void handleAccept(Connection::Pointer newConn,
        const boost::system::error_code& error)
    {
        std::cout << "Server::handleAccept()" << std::endl;
        if(error)
        {
            std::cout << "CONNECTION ERROR: ";
            std::cout << boost::system::system_error(error).what();
            std::cout << std::endl;
        }
        else
        {
            std::cout << "Connection accepted" << std::endl;
            startAccept();
            newConn->startRead();
        }
    }
    ip::tcp::acceptor acceptor;
};

int main()
{
    std::cout << "Start server" << std::endl;
    asio::io_service ioService;
    RemoteAdminServer server(ioService);
    boost::system::error_code error;
    ioService.run(error);
}
4

2 回答 2

11

您应该更改此代码段:

   void startRead()
   {
       std::cout << "Connection::startRead()" << std::endl;
       socket.async_read_some(boost::asio::buffer(readBuffer),
                              boost::bind(&Connection::handleRead,this,_1,_2));
   }

至:

void startRead()
{
     std::cout << "Connection::startRead()" << std::endl;
     socket.async_read_some(boost::asio::buffer(readBuffer),
                boost::bind(&Connection::handleRead,this->shared_from_this(),_1,_2));
}

请注意,我将共享指针传递给bind. 这将保留您的Connection实例,直到调用处理程序。否则,使用计数变为零Server::startAccept并删除对象。然后,当调用处理程序时,内存是无效的,您会遇到可怕的“未定义行为”。

于 2009-08-04T11:32:00.923 回答
-1

我认为您的运行存在,因为您的工作队列中没有任何工作。

您必须防止运行退出并破坏您的服务对象。

试试这个:

boost::asio::io_service::work

或者只是做一个

do { ioService.run( error ); } while( !error );
于 2009-08-03T15:32:06.950 回答