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2010-05-17T02:59:21.013
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Generally, once you've made a call to <code>io_service::run</code>, there's often few reasons to call <code>io_service::stop</code> or <code>io_service::reset</code>. In your code above, the <code>connect</code> method is not going to actively establish a connection - <code>tcp::resolver::resolve</code> merely turns a query (such as a hostname, or an IP address, etc.) into a TCP endpoint which can be used to connect a socket. You typically need to dereference an iterator returned by <code>resolver::resolve</code> and pass it to a <code>boost::asio::ip::tcp::socket</code> object's <code>connect</code> method (or one of the asynchronous varieties) to connect an endpoint. The Asio tutorials have a good example of this. See the first synchronous TCP daytime server example here: <a href="http://www.boost.org/doc/libs/1_43_0/doc/html/boost_asio/tutorial/tutdaytime1.html" rel="nofollow noreferrer">http://www.boost.org/doc/libs/1_43_0/doc/html/boost_asio/tutorial/tutdaytime1.html</a>. Note that the code first runs: <pre><code>tcp::resolver::iterator endpoint_iterator = resolver.resolve(query); </code></pre> to turn a query object into a TCP endpoint, and then: <pre><code>socket.connect(*endpoint_iterator++, error); </code></pre> to connect a socket object on that endpoint. As for what should go in your <code>disconnect</code> method, that's entirely dependent on the application. But usually you'll need to keep track of an active connection by encapsulating a <code>socket</code> object, which you can close as necessary when you call <code>disconnect</code>. For an example of this, have a look at the tutorial titled "Daytime 3 - An Asynchronous TCP daytime server" here: <a href="http://www.boost.org/doc/libs/1_43_0/doc/html/boost_asio/tutorial/tutdaytime3.html" rel="nofollow noreferrer">http://www.boost.org/doc/libs/1_43_0/doc/html/boost_asio/tutorial/tutdaytime3.html</a>
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