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[英]Boost::asio socket - how to make read_some 'throw' in “timeout”?
[英]Boost.Asio read_some: End of file error
此示例基于Boost.Asio C++ Network Programming一书中的第 1 章。 我正在尝试使用 Boost.Asio 库构建一个简单的客户端和同步服务器。
这是客户端代码
#define BOOST_ASIO_SEPARATE_COMPILATION
#include <iostream>
#include <boost/asio/impl/src.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/write.hpp>
#include <string>
int main(int argc, char **argv) {
boost::asio::io_service ioservice;
boost::asio::ip::tcp::endpoint ep(boost::asio::ip::address::from_string("127.0.0.1"),2001);
boost::asio::ip::tcp::socket sock(ioservice);
sock.connect(ep);
return 0;
}
这是服务器代码。
#define BOOST_ASIO_SEPARATE_COMPILATION
#include <stdio.h>
#include <iostream>
#include <boost/asio/impl/src.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio/write.hpp>
using namespace boost::asio;
typedef boost::shared_ptr<boost::asio::ip::tcp::socket> socket_ptr;
void client_session(socket_ptr sock);
int main(int argc, char **argv) {
io_service ioservice;
ip::tcp::endpoint ep(ip::tcp::v4(),2001);
ip::tcp::acceptor acc(ioservice,ep);
while(true){
socket_ptr sock(new ip::tcp::socket(ioservice));
acc.accept(*sock);
boost::thread(boost::bind(client_session,sock));
}
return 0;
}
void client_session(socket_ptr sock)
{
std::cout << "Handling client session \n";
while(true){
char data[512];
size_t len = sock->read_some(buffer(data));
if (len > 0)
boost::asio::write(*sock,buffer("ok",2));
}
}
运行服务器后,当我启动客户端时,我在服务器上得到以下输出
Handling client session
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
what(): read_some: End of file
Aborted
我不确定这里发生了什么。 请帮忙。
您的服务器希望客户端在连接后发送一些数据,但它没有。 客户端在连接后简单地退出。
客户端的以下修改只是将数据无限循环发送到服务器,服务器总是以“ok”响应。
#define BOOST_ASIO_SEPARATE_COMPILATION
#include <iostream>
#include <boost/asio/impl/src.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/write.hpp>
#include <string>
int main(int argc, char **argv) {
boost::asio::io_service ioservice;
boost::asio::ip::tcp::endpoint ep(boost::asio::ip::address::from_string("127.0.0.1"),2001);
boost::asio::ip::tcp::socket sock(ioservice);
sock.connect(ep);
for(;;)
{
boost::array<char, 512> buf = {{ 0 }};
boost::system::error_code ignored_error;
boost::asio::write(sock, boost::asio::buffer(buf), ignored_error);
size_t len = sock.read_some(boost::asio::buffer(buf), ignored_error);
std::cout.write(buf.data(), len);
}
return 0;
}
为了避免在客户端断开连接时服务器崩溃,您应该将read_some
调用包装在try...catch
块中:
void client_session(socket_ptr sock)
{
std::cout << "Handling client session \n";
try
{
while(true){
char data[512];
size_t len = sock->read_some(buffer(data));
if (len > 0)
boost::asio::write(*sock,buffer("ok",2));
}
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
您还应该查看 boost asio 文档中的示例: http : //www.boost.org/doc/libs/1_58_0/doc/html/boost_asio/tutorial.html
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