【发布时间】：2015-10-30 18:14:53
【问题描述】：
我正在编写一个简单的 tcp 客户端来发送和接收单行文本。异步操作由 std::future 处理，以促进具有超时的阻塞查询。不幸的是，我的测试应用程序在破坏服务器对象时因访问冲突而崩溃。 这是我的代码：
TCPClient.hpp
#ifndef __TCPCLIENT_H__
#define __TCPCLIENT_H__
#include <boost/asio.hpp>
#include <boost/asio/use_future.hpp>
#include <memory>
#include <vector>
#include <future>
#include <thread>
#include <chrono>
#include <iostream>
#include <iterator>
using namespace boost::asio;
class TCPClient {
public:
TCPClient();
~TCPClient();
void connect(const std::string& address, const std::string& port);
void disconnect();
std::string sendMessage(const std::string& msg);
private:
boost::asio::io_service ioservice;
boost::asio::io_service::work work;
std::thread t;
std::unique_ptr<boost::asio::ip::tcp::socket> socket;
};
inline TCPClient::TCPClient() : ioservice(), work(ioservice) {
t = std::thread([&]() {
try {
ioservice.run();
}
catch (const boost::system::system_error& e) {
std::cerr << e.what() << std::endl;
}
});
}
inline TCPClient::~TCPClient() {
disconnect();
ioservice.stop();
if (t.joinable()) t.join();
}
inline void TCPClient::connect(const std::string& address, const std::string& port) {
socket.reset(new ip::tcp::socket(ioservice));
ip::tcp::resolver::query query(address, port);
std::future<ip::tcp::resolver::iterator> conn_result = async_connect(*socket, ip::tcp::resolver(ioservice).resolve(query), use_future);
if (conn_result.wait_for(std::chrono::seconds(6)) != std::future_status::timeout) {
conn_result.get(); // throws boost::system::system_error if the operation fails
}
else {
//socket->close();
// throw timeout_error("Timeout");
throw std::exception("timeout");
}
}
inline void TCPClient::disconnect() {
if (socket) {
try {
socket->shutdown(ip::tcp::socket::shutdown_both);
std::cout << "socket points to " << std::addressof(*socket) << std::endl;
socket->close();
}
catch (const boost::system::system_error& e) {
// ignore
std::cerr << "ignored error " << e.what() << std::endl;
}
}
}
inline std::string TCPClient::sendMessage(const std::string& msg) {
auto time_over = std::chrono::system_clock::now() + std::chrono::seconds(4);
/*
// Doesn't affect the error
std::future<size_t> write_fut = boost::asio::async_write(*socket, boost::asio::buffer(msg), boost::asio::use_future);
try {
write_fut.get();
}
catch (const boost::system::system_error& e) {
std::cerr << e.what() << std::endl;
}
*/
boost::asio::streambuf response;
std::future<std::size_t> read_fut = boost::asio::async_read_until(*socket, response, '\n', boost::asio::use_future);
if (read_fut.wait_until(time_over) != std::future_status::timeout) {
std::cout << "read " << read_fut.get() << " bytes" << std::endl;
return std::string(std::istreambuf_iterator<char>(&response), std::istreambuf_iterator<char>());
}
else {
std::cout << "socket points to " << std::addressof(*socket) << std::endl;
throw std::exception("timeout");
}
}
#endif
main.cpp
#include <iostream>
#include "TCPClient.hpp"
int main(int argc, char* argv[]) {
TCPClient client;
try {
client.connect("localhost", "27015");
std::cout << "Response: " << client.sendMessage("Hello!") << std::endl;
}
catch (const boost::system::system_error& e) {
std::cerr << e.what() << std::endl;
}
catch (const std::exception& e) {
std::cerr << e.what() << std::endl;
}
system("pause");
return 0;
}
输出如预期的那样是“超时”（测试服务器故意不发送数据），但ioservice.run() 在关闭TCPClient::disconnect() 中的套接字后立即崩溃（访问冲突）。我在这里做一些内存管理不善吗？
编译器是 MSVC 12.0.31101.00 Update 4 (Visual Studio 2013)
【问题讨论】：
标签： c++ c++11 asynchronous boost-asio