websocket++简单使用例子

jekeyhui99 · 发表于 2017-1-30 21:30:46

　html5支持使用websocket协议与服务器保持一个长连接，方便双方互相传输数据，而且服务器也能主动发送信息给客户端，而在这之前使用HTTP是很难做到的。下面介绍使用C++实现的websocket++的简单使用。websocket++更详细介绍点此。
　　websocket++需要boost的支持，所以工程中需要包含boost的头文件和库。boost在VS中的如何使用参考此文章。
C++代码
1 #include "stdafx.h"
2 #include <iostream>
3
4 using namespace std;
5
6 #include <websocketpp/config/asio_no_tls.hpp>
7 #include <websocketpp/server.hpp>
8
9 typedef websocketpp::server<websocketpp::config::asio> WebsocketServer;
10 typedef WebsocketServer::message_ptr message_ptr;
11
12 using websocketpp::lib::placeholders::_1;
13 using websocketpp::lib::placeholders::_2;
14 using websocketpp::lib::bind;
15
16 void OnOpen(WebsocketServer *server, websocketpp::connection_hdl hdl)
17 {
18    cout << "have client connected" << endl;
19 }
20
21 void OnClose(WebsocketServer *server, websocketpp::connection_hdl hdl)
22 {
23    cout << "have client disconnected" << endl;
24 }
25
26 void OnMessage(WebsocketServer *server, websocketpp::connection_hdl hdl, message_ptr msg)
27 {
28    string strMsg = msg->get_payload();
29    cout << strMsg << endl;
30
31    string strRespon = "receive: ";
32    strRespon.append(strMsg);
33
34    server->send(hdl, strRespon, websocketpp::frame::opcode::text);
35 }
36
37 int main()
38 {
39    WebsocketServer                   server;
40
41    // Set logging settings
42    server.set_access_channels(websocketpp::log::alevel::all);
43    server.clear_access_channels(websocketpp::log::alevel::frame_payload);
44
45    // Initialize ASIO
46    server.init_asio();
47
48    // Register our open handler
49    server.set_open_handler(bind(&OnOpen, &server, ::_1));
50
51    // Register our close handler
52    server.set_close_handler(bind(&OnClose, &server, _1));
53
54    // Register our message handler
55    server.set_message_handler(bind(&OnMessage, &server, _1, _2));
56
57    //Listen on port 2152
58    server.listen(8090);
59
60    //Start the server accept loop
61    server.start_accept();
62
63    //Start the ASIO io_service run loop
64    server.run();
65
66    return 0;
67 }

Html代码
1 <!DOCTYPE html>
2 <html>
3 <head>
4 <title>Testing websockets</title>
5 </head>
6 <body>
7 <div>
8    <input type="submit" value="Start" />
9 </div>
10 <div id="messages"></div>
11 <script type="text/javascript">
12    var webSocket =
13    new WebSocket('ws://localhost:8090');
14
15    webSocket.onerror = function(event) {
16    onError(event)
17    };
18
19    webSocket.onopen = function(event) {
20    onOpen(event)
21    };
22
23    webSocket.onclose = function(event) {
24    onClose(event)
25    };
26
27    webSocket.onmessage = function(event) {
28    onMessage(event)
29    };
30
31    function onMessage(event) {
32    document.getElementById('messages').innerHTML
33       += '<br />' + event.data;
34    }
35
36    function onOpen(event) {
37    document.getElementById('messages').innerHTML
38       = 'Connection established';
39    }
40
41    function onClose(event) {
42    document.getElementById('messages').innerHTML
43       += '<br />disconnection';
44    }
45    function onError(event) {
46    alert(event.data);
47    }
48
49    function start() {
50    webSocket.send('hello');
51    return false;
52    }
53 </script>
54 </body>
55 </html>

运行结果

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