c++ - 使用 Visual Studio boost asio TCP IP asio 类编译错误。错误 : C2228: left of '.close' must have class/struct/union

Question

我正在尝试按照本页中提供的步骤进行操作

http://www.boost.org/doc/libs/1_46_0/doc/html/boost_asio/tutorial/tutdaytime1.html

但是，有时代码无法编译，并给出指定的错误。我无法理解这是一种什么样的冲突。似乎未正确创建对象 tcpsock。请检查我的代码:

io_service io_tcp;
tcp::resolver resolverObject(io_tcp);
tcp::resolver::query queryObject(argv[1], "daytime");
tcp::resolver::iterator endpoint_iterator = resolverObject.resolve(queryObject);
tcp::resolver::iterator end; //default constructor is end iterator

tcp::socket tcpsock(io_service);
boost::system::error_code socketError = boost::asio::error::host_not_found;

while (socketError && endpoint_iterator != end)
{
    //Apparently, the object isn't created correctly
    tcpsock.close(); //error happenes here
    tcpsock.connect(*endpoint_iterator++, socketError); //error happenes here too
}
if (socketError)
    throw boost::system::system_error(socketError);

感谢您的努力。

Answer 1

您正在使用 io_service 类型初始化 tcpsock，而不是使用变量 io_tcp。