我正在尝试使用c ++中的新类包装boost TCP。当我直接调用boost函数时,事情就像一个魅力。但是,当关闭包装在类函数中时,我无法调用套接字关闭。请帮助看看以下代码。
课程定义:
typedef boost::shared_ptr<tcp::socket> Socket;
class TCPConnector{
public :
bool isConnected;
Socket sock;
string ip;
int port;
TCPConnector(string ip, int port);
void Close();
bool Connect();
};
功能
TCPConnector::TCPConnector(string ip,int port):ip(ip),port(port)
{
}
void TCPConnector::Close() {
boost::system::error_code error;
if (!isConnected)
return;
isConnected = false;
try {
sock->shutdown(boost::asio::ip::tcp::socket::shutdown_both, error);
cout << "ShutDown" << endl;
if (error)
throw boost::system::system_error(error);
sock->close(error);
if (error)
throw boost::system::system_error(error);
} catch (exception& e) {
cout << "#TCPConnector::Close()#" << e.what() << endl;
}
}
主要功能:
int main(int argc, char* argv[]) {
try {
TCPConnector* conn = new TCPConnector("127.0.0.1",8088);
for (int i = 0; i < 2; i++) {
boost::asio::io_service io_service;
tcp::resolver resolver(io_service);
tcp::resolver::query query(tcp::v4(), "127.0.0.1", "8088");
tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
conn->sock.reset(new tcp::socket(io_service));
conn->sock->connect(*endpoint_iterator);
cout << "Connected" << endl;
boost::thread acceptorThread(boost::bind(receive,conn));
sleep(1);
unsigned char msg[8] = { 0, 6, 55, 56, 55, 56, 55, 0 };
boost::system::error_code error;
try {
boost::asio::write(*conn->sock, boost::asio::buffer(msg, 8),
boost::asio::transfer_all(), error);
cout << "Sent" << endl;
if (error)
throw boost::system::system_error(error);
conn->sock->shutdown(boost::asio::ip::tcp::socket::shutdown_both,
error);
if (error)
throw boost::system::system_error(error);
conn->sock->close(error);//close socket directly , the result is ok
//conn->Close();// close by calling functions, it causes problems.
cout << "Closed" << endl;
if (error)
throw boost::system::system_error(error);
io_service.stop();
} catch (std::exception& e) {
std::cerr << "Exception in thread: " << e.what() << "\n";
}
cout << "Sleep" << endl;
sleep(2);
cout << "Wake up" << endl;
}
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
}
return 0;
}
这两行给出了不同的行为。我不知道为什么第二个会引起问题。
conn->sock->close(error);//close socket directly , the result is ok
conn->Close();// close by calling functions, it causes problems.
互斥锁:
上打印了无效参数sock->close(error);
if (error)
throw boost::system::system_error(error);
问题是否与shared_ptr有关?或者我错过了关闭插座的重要事项?
感谢您的任何建议。
答案 0 :(得分:3)
问题是io_service
应该比socket
更长。
在除for
循环的第一次迭代之外的所有循环中,语句conn->sock.reset(new tcp::socket(io_service));
调用前一次迭代的套接字的析构函数。这个析构函数访问前一个迭代的io_service
(特别是它的互斥锁)的元素,到那时它们本身就被破坏了。
要解决此问题,您可以将io_service
移到for
循环之外,也可以在conn->sock.reset();
循环结束时调用for
以调用<{1}}仍然有效时socket
的析构函数。