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POBoost asio : how to keep a client connection alive?
 

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  1. POBoost asio : how to keep a client connection alive?
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    <p>I try to create a client who keep the connection alive on the server.</p> <p>However, when i receive data once, the connection was closed. I don't understand why.</p> <p>I think that i should make a loop, but we told me that wasn't a good idea.</p> <pre><code>class client { public: client(boost::asio::io_service&amp; io_service, const std::string&amp; host, const std::string&amp; service) : connection_(io_service) { // Resolve the host name into an IP address. boost::asio::ip::tcp::resolver resolver(io_service); boost::asio::ip::tcp::resolver::query query(host, service); boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query); boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator; // Start an asynchronous connect operation. connection_.socket().async_connect(endpoint, boost::bind(&amp;client::handle_connect, this, boost::asio::placeholders::error, ++endpoint_iterator)); } /// Handle completion of a connect operation. void handle_connect(const boost::system::error_code&amp; e, boost::asio::ip::tcp::resolver::iterator endpoint_iterator) { if (!e) { // Successfully established connection. Start operation to read the list // of stocks. The connection::async_read() function will automatically // decode the data that is read from the underlying socket. connection_.async_read(stocks_, boost::bind(&amp;client::handle_read, this, boost::asio::placeholders::error)); } else { std::cerr &lt;&lt; e.message() &lt;&lt; std::endl; } } /// Handle completion of a read operation. void handle_read(const boost::system::error_code&amp; e) { if (!e) { // Print out the data that was received. for (std::size_t i = 0; i &lt; stocks_.size(); ++i) { std::cout &lt;&lt; "Paquet numero " &lt;&lt; i &lt;&lt; "\n"; std::cout &lt;&lt; " age: " &lt;&lt; stocks_[i].age &lt;&lt; "\n"; std::cout &lt;&lt; " name: " &lt;&lt; stocks_[i].nom &lt;&lt; "\n"; } // Maybe Should i put something here ? } else { // An error occurred. std::cerr &lt;&lt; "Error : " &lt;&lt; e.message() &lt;&lt; std::endl; connection_.socket().close(); } // or maybe here ? } private: /// The connection to the server. connection connection_; std::vector&lt;stock&gt; stocks_; }; </code></pre> <p>the main looks like this :</p> <pre><code>int main(int argc, char* argv[]) { try { // Check command line arguments. if (argc != 3) { std::cerr &lt;&lt; "Usage: client &lt;host&gt; &lt;port&gt;" &lt;&lt; std::endl; return 1; } boost::asio::io_service io_service; client client(io_service, argv[1], argv[2]); io_service.run(); } catch (std::exception&amp; e) { std::cerr &lt;&lt; e.what() &lt;&lt; std::endl; } return 0; } </code></pre>
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