再次调用async_read将引发异常
再次调用async_read将引发异常
提问于 2014-05-04 13:24:42
我有以下代码：
void GnutellaApp::HandleRead (boost::asio::ip::tcp::socket& socket)
{
char buf[128];
try {
boost::asio::async_read( socket,
boost::asio::buffer(buf),
boost::asio::transfer_all(),
boost::bind(&GnutellaApp::HandleRead,
this,
boost::ref(socket)
)
);
}
catch (boost::system::system_error const& e)
{
std::cout << "Warning: " << e.what() << std::endl;
}
}当调用HandleRead并执行async_read时，它会抛出一个异常。为了异步等待下一个请求，我们需要再次调用async_read，对吗？第一次调用async_read成功。
我得到了下面的例外
我得到了下面的例外
Gnutella.exe!std::_Ref_count_base::_Incwref() Line 113 C++
Gnutella.exe!std::_Ptr_base<void>::_Resetw<void>(void * _Other_ptr, std::_Ref_count_base * _Other_rep) Line 458 C++
Gnutella.exe!std::_Ptr_base<void>::_Resetw<void>(const std::_Ptr_base<void> & _Other) Line 445 C++
Gnutella.exe!std::weak_ptr<void>::weak_ptr<void><void>(const std::shared_ptr<void> & _Other, void * * __formal) Line 994 C++
Gnutella.exe!boost::asio::detail::win_iocp_socket_service_base::async_receive<boost::asio::mutable_buffers_1,boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >(boost::asio::detail::win_iocp_socket_service_base::base_implementation_type & impl, const boost::asio::mutable_buffers_1 & buffers, int flags, boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > & handler) Line 292 C++
Gnutella.exe!boost::asio::stream_socket_service<boost::asio::ip::tcp>::async_receive<boost::asio::mutable_buffers_1,boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >(boost::asio::detail::win_iocp_socket_service<boost::asio::ip::tcp>::implementation_type & impl, const boost::asio::mutable_buffers_1 & buffers, int flags, boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > && handler) Line 359 C++
Gnutella.exe!boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >::async_read_some<boost::asio::mutable_buffers_1,boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >(const boost::asio::mutable_buffers_1 & buffers, boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > && handler) Line 846 C++
Gnutella.exe!boost::asio::detail::read_op<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >::operator()(const boost::system::error_code & ec, unsigned int bytes_transferred, int start) Line 273 C++
Gnutella.exe!boost::asio::async_read<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >,boost::asio::mutable_buffers_1,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >(boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > & s, const boost::asio::mutable_buffers_1 & buffers, boost::asio::detail::transfer_all_t completion_condition, boost::_bi::bind_t<void,boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>,boost::_bi::list2<boost::_bi::value<GnutellaApp *>,boost::reference_wrapper<boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > && handler) Line 535 C++
Gnutella.exe!GnutellaApp::HandleRead(boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > & socket) Line 232 C++
> Gnutella.exe!boost::_mfi::mf1<void,GnutellaApp,boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > &>::operator()(GnutellaApp * p, boost::asio::basic_stream_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> > & a1) Line 165 C++
Gnutella.exe!boost::_bi::list2<boost::_bi::value回答 1
Stack Overflow用户
回答已采纳
发布于 2014-05-04 14:53:09
似乎您持有的是一个陈旧的引用。
此外，boost::asio::buffer(buf)是一个明显的进攻，因为buf是一个堆栈本地，但async_read是.那么异步。
常见的模式是
- 使
buf和socket类成员(因此它们肯定比异步请求更有效) - 使
buf和socket共享(boost::shared_ptr<boost::asio::ip::tcp::socket>)，您只需通过值传递/绑定： bind(&GnutellaApp：：HandleRead，this，socket ) ，只要绑定函数调用在io服务中保持活动状态，就可以通过shared_ptr使套接字保持活动。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23456782
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