1、下载websocketpp，地址为https://github.com/zaphoyd/websocketpp，版本为0.7。
2、下载boost，地址为https://www.boost.org/，版本为1.6.3。
3、说明：websocketpp并不是必须需要boost，如果C++编译为C11以上，是可以不用的。
4、Qt创建一个console工程(如：websocketClient)，将下载下来的websocket_master里面的websocket文件夹放到该工程目录下，在webSocketClient.pro文件中添加include(websocket/websocket.pri)，
5、创建websocket_client类，头文件websocket_client.h内容如下：
#include <websocketpp/config/asio_no_tls_client.hpp>
#include <websocketpp/client.hpp>
#include <websocketpp/common/thread.hpp>
#include <websocketpp/common/memory.hpp>
#include <iostream>
#include <sstream>
#include <cstdlib>
#include <string>
#include <map>
using namespace websocketpp::lib::placeholders;
typedef websocketpp::client<websocketpp::config::asio_client> client;
class connection_metadata
{
public:
typedef websocketpp::lib::shared_ptr<connection_metadata> ptr;
connection_metadata(websocketpp::connection_hdl hdl, std::string uri)
: m_hdl(hdl)
, m_status("Connecting")
, m_uri(uri)
, m_server("N/A")
{}
void on_open(client *echo_client, websocketpp::connection_hdl hdl)
{
m_status = "Open";
client::connection_ptr con = echo_client->get_con_from_hdl(hdl);
m_server = con->get_response_header("Server");
}
void on_fail(client *echo_client, websocketpp::connection_hdl hdl
{
m_status = "Failed";
client::connection_ptr con = echo_client->get_con_from_hdl(hdl);
m_server = con->get_response_header("Server");
m_error_reason = con->get_ec().message();
}
void on_close(client *echo_client, websocketpp::connection_hdl hdl)
{
m_status = "Closed";
client::connection_ptr con = echo_client->get_con_from_hdl(hdl);
std::stringstream s;
s << "close code: " << con->get_remote_close_code() << " ("
<< websocketpp::close::status::get_string(con->get_remote_close_code())
<< "), close reason: " << con->get_remote_close_reason();
m_error_reason = s.str();
}
void on_message(websocketpp::connection_hdl hdl, client::message_ptr msg)
{
if(msg->get_opcode() == websocketpp::frame::opcode::text)
{
std::cout << "on message called with hdl: " << hdl.lock().get() << "and message: " << msg->get_payload() << std::endl;
m_messages.push_back("<< " + msg->get_payload());
}
else
{
m_messages.push_back("<< " + websocketpp::utility::to_hex(msg->get_payload()));
}
}
websocketpp::connection_hdl get_hdl() const
{
return m_hdl;
}
std::string get_status() const
{
return m_status;
}
std::string get_uri() const
{
return m_uri;
}
void record_sent_message(std::string message)
{
m_messages.push_back(">> " + message);
}
friend std::ostream & operator<< (std::ostream & out, connection_metadata const & data);
private:
websocketpp::connection_hdl m_hdl;
std::string m_status;
std::string m_uri;
std::string m_server;
std::string m_error_reason;
std::vector<std::string> m_messages;
};
std::ostream & operator<< (std::ostream & out, connection_metadata const & data);
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class websocket_client
{
public:
websocket_client();
~websocket_client();
int connect(std::string const & uri);
void close();
void send(std::string message);
void show();
private:
client echo_client;
connection_metadata::ptr Con;
websocketpp::lib::shared_ptr<websocketpp::lib::thread> m_thread;
};
websocket_client.cpp文件内容如下：
std::ostream & operator<< (std::ostream & out, connection_metadata const & data)
{
out << "> URI: " << data.m_uri << " "
<< "> Status: " << data.m_status << " "
<< "> Remote Server: " << (data.m_server.empty() ? "None Specified" : data.m_server) << " "
<< "> Error/close reason: " << (data.m_error_reason.empty() ? "N/A" : data.m_error_reason) << " ";
out << "> Messages Processed: (" << data.m_messages.size() << ") ";
for (std::vector<std::string>::const_iterator it = data.m_messages.begin(); it != data.m_messages.end(); ++it)
{
out << *it << " ";
}
return out;
}
websocket_endpoint::websocket_endpoint()
{
echo_client.clear_access_channels(websocketpp::log::alevel::all);
echo_client.clear_error_channels(websocketpp::log::elevel::all);
echo_client.init_asio();
echo_client.start_perpetual();
m_thread = websocketpp::lib::make_shared<websocketpp::lib::thread>(&client::run, &echo_client);
}
websocket_endpoint::~websocket_endpoint()
{
echo_client.stop_perpetual();
if(Con->get_status() == "Open")
{
websocketpp::lib::error_code ec;
echo_client.close(Con->get_hdl(), websocketpp::close::status::going_away, "", ec);
if(ec)
{
std::cout << "> Error closing ws connection " << Con->get_uri() << " :" << ec.message() << std::endl;
}
}
m_thread->join();
}
int websocket_endpoint::connect(std::string const & uri)
{
websocketpp::lib::error_code ec;
client::connection_ptr pConnection = echo_client.get_connection(uri,ec);
if(ec)
{
std::cout << "> Connect initialization error: " << ec.message() << std::endl;
return -1;
}
Con = websocketpp::lib::make_shared<connection_metadata>(pConnection->get_handle(),uri);
pConnection->set_open_handler(websocketpp::lib::bind(&connection_metadata::on_open,Con,&echo_client,::_1));
pConnection->set_fail_handler(websocketpp::lib::bind(&connection_metadata::on_fail,Con,&echo_client,::_1));
pConnection->set_close_handler(websocketpp::lib::bind(&connection_metadata::on_close,Con,&echo_client,::_1));
pConnection->set_message_handler(websocketpp::lib::bind(&connection_metadata::on_message,Con,::_1,::_2));
echo_client.connect(pConnection);
return 0;
}
void websocket_endpoint::close()
{
if(Con->get_status() == "Open")
{
websocketpp::lib::error_code ec;
echo_client.close(Con->get_hdl(),websocketpp::close::status::normal,"",ec);
if(ec)
{
std::cout << "> Error initiating close: " << ec.message() << std::endl;
}
}
}
void websocket_endpoint::send(std::string message)
{
websocketpp::lib::error_code ec;
echo_client.send(Con->get_hdl(), message, websocketpp::frame::opcode::text, ec);
if(ec)
{
std::cout << "> Error sending messages: " << ec.message() <<std::endl;
return;
}
Con->record_sent_message(message);
}
void websocket_endpoint::show()
{
std::cout << *Con << std::endl;
}
6、运行程序后，在终端输入命令
Enter Command： send 11111111（向服务器发送1111111111）
Enter Command：show（显示websocketpp客户端信息及已经发送和接收的数据）
Enter Command：quit（退出）