C++编写的WebSocket服务端客户端实现示例代码

目录

    使用过标准的libwebsockets服务端库测试过,主要是短小精悍,相对于libwebsockets不需要依赖zlib和openssl 以及其他库,直接make就可以使用了,linux跟windows都可以使用。
    【C++编写的WebSocket服务端客户端实现示例代码】测试用例:
    #include "easywsclient.hpp"#include #include #include using easywsclient::WebSocket; static WebSocket::pointer ws = NULL; void handle_message(const std::string & message){printf(">>> %s\n", message.c_str()); if (message == "world") { ws->close(); }} int main(){ws = WebSocket::from_url("ws://localhost:8126/foo"); assert(ws); //判断ws对象是否为空nullws->send("goodbye"); ws->send("hello"); //如果你需要多线程,可以在一个thread 维护该ws的连接重连机制while (ws->getReadyState() != WebSocket::CLOSED) //判断ws是否正常连接{ws->poll(); //这个必须要调用,否则不能发送,发送跟接收都是异步的,都是在这个poll函数里监测处理的ws->dispatch(handle_message); }delete ws; return 0; }

    //线程thread维护重连连接void run(){bool conn = FLASE; ws = WebSocket::from_url("ws://localhost:8126/foo"); //如果你需要多线程,可以在一个thread 维护该ws的连接重连机制while (1) //判断ws是否正常连接{if(ws != NULL){ws->poll(0); //这个必须要调用,否则不能发送,发送跟接收都是异步的,都是在这个poll函数里监测处理的ws->dispatch(handle_message); if(ws->getReadyState() == WebSocket::CLOSED){//ws连接断开 重连delete ws; ws = NULL; ws = WebSocket::from_url("ws://localhost:8126/foo"); }else if(wss->getReadyState()== WebSocket::OPEN){//ws连接ok//ws->send("goodbye"); ws->send("hello"); }}else{ws = WebSocket::from_url("ws://localhost:8126/foo"); sleep(1); }usleep(100); }if(ws!=NULL)delete ws; }

    有细心的朋友发现在发送中文GBK 的时候与服务端会断开

    //GBK -> UTF-8 //遇到发送的字符串里有中文的话需要send 前进行转换一下,//这个是网友提供的在windows下的转换函数std::string Server_Stream::GBKToUTF8(const std::string& strGBK){ std::string strOutUTF8 = ""; WCHAR * str1; int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0); str1 = new WCHAR[n]; MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n); n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL); char * str2 = new char[n]; WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL); strOutUTF8 = str2; delete[]str1; str1 = NULL; delete[]str2; str2 = NULL; return strOutUTF8; }

    下面是C++实现的WebSocket客户端,写好后这里记一下,免得以后忘记。
    本示例共有三个文件组成,依赖Websocket++第三方库
    其中main.cpp是使用示例
    #include #include #include #include "websocket_endpoint.h" int main(int argc, char **argv){ bool done = false; std::string input; kagula::websocket_endpoint endpoint; endpoint.connect("ws://localhost:9002"); while (!done) {std::cout << "Enter Command: "; std::getline(std::cin, input); if (input == "quit") {done = true; }else if (input.substr(0, 4) == "send") {std::stringstream ss(input); std::string cmd; std::string message; ss >> cmd; std::getline(ss, message); endpoint.send(message); }else if (input.substr(0, 4) == "show") {endpoint.show(); }else {std::cout << "> Unrecognized Command" << std::endl; } } endpoint.close(); return 0; }

    其它两个文件是封装
    websocket_endpoint.h文件清单
    #ifndef _WEBSOCKET_ENDPOINT_#define _WEBSOCKET_ENDPOINT_ #include /*Title: Web Socket ClientAuthor: kagulaDate: 2016-11-21Dependencies: Websocket++、Boost::ASIOTest Environment: VS2013 Update5, WebSocket++ 0.70, Boost 1.61Description:[1]Support connect a web socket server.[2]If server is crash, client will not follow crash.*/ namespace kagula{ class websocket_endpoint { public:websocket_endpoint(); ~websocket_endpoint(); int connect(std::string const & uri); void close(); void send(std::string message); void show(); }; } #endif

    websocket_endpoint.cpp文件清单
    #include #include #include #include #include #include #include #include #include #include "websocket_endpoint.h" typedef websocketpp::client ws_client; namespace kagula{ class connection_metadata { public:typedef websocketpp::lib::shared_ptr 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(ws_client *client, websocketpp::connection_hdl hdl) {m_status = "Open"; ws_client::connection_ptr con = client->get_con_from_hdl(hdl); m_server = con->get_response_header("Server"); } // if connection failed, the function will be invoke.void on_fail(ws_client *client, websocketpp::connection_hdl hdl) {m_status = "Failed"; ws_client::connection_ptr con = client->get_con_from_hdl(hdl); m_server = con->get_response_header("Server"); m_error_reason = con->get_ec().message(); } void on_close(ws_client *client, websocketpp::connection_hdl hdl) {m_status = "Closed"; ws_client::connection_ptr con = 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, ws_client::message_ptr msg) {if (msg->get_opcode() == websocketpp::frame::opcode::text) {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 m_messages; }; std::ostream & operator<< (std::ostream & out, connection_metadata const & data) {out << "> URI: " << data.m_uri << "\n"<< "> Status: " << data.m_status << "\n"<< "> Remote Server: " << (data.m_server.empty() ? "None Specified" : data.m_server) << "\n"<< "> Error/close reason: " << (data.m_error_reason.empty() ? "N/A" : data.m_error_reason) << "\n"; out << "> Messages Processed: (" << data.m_messages.size() << ") \n"; std::vector::const_iterator it; for (it = data.m_messages.begin(); it != data.m_messages.end(); ++it) {out << *it << "\n"; } return out; } ws_client g_wsEndPoint; connection_metadata::ptr g_wsClientConnection; websocketpp::lib::shared_ptr g_threadWS; websocket_endpoint::websocket_endpoint(){g_wsEndPoint.clear_access_channels(websocketpp::log::alevel::all); g_wsEndPoint.clear_error_channels(websocketpp::log::elevel::all); g_wsEndPoint.init_asio(); g_wsEndPoint.start_perpetual(); g_threadWS = websocketpp::lib::make_shared(&ws_client::run, &g_wsEndPoint); } websocket_endpoint::~websocket_endpoint() {g_wsEndPoint.stop_perpetual(); if (g_wsClientConnection->get_status() == "Open") {// Only close open connectionswebsocketpp::lib::error_code ec; g_wsEndPoint.close(g_wsClientConnection->get_hdl(), websocketpp::close::status::going_away, "", ec); if (ec) {std::cout << "> Error closing ws connection " << g_wsClientConnection->get_uri() << " :" << ec.message() << std::endl; }} g_threadWS->join(); } int websocket_endpoint::connect(std::string const & uri) {websocketpp::lib::error_code ec; ws_client::connection_ptr pConnection = g_wsEndPoint.get_connection(uri, ec); if (ec) {std::cout << "> Connect initialization error: " << ec.message() << std::endl; return -1; } g_wsClientConnection = websocketpp::lib::make_shared(pConnection->get_handle(), uri); pConnection->set_open_handler(websocketpp::lib::bind(&connection_metadata::on_open,g_wsClientConnection,&g_wsEndPoint,websocketpp::lib::placeholders::_1)); pConnection->set_fail_handler(websocketpp::lib::bind(&connection_metadata::on_fail,g_wsClientConnection,&g_wsEndPoint,websocketpp::lib::placeholders::_1)); pConnection->set_close_handler(websocketpp::lib::bind(&connection_metadata::on_close,g_wsClientConnection,&g_wsEndPoint,websocketpp::lib::placeholders::_1)); pConnection->set_message_handler(websocketpp::lib::bind(&connection_metadata::on_message,g_wsClientConnection,websocketpp::lib::placeholders::_1,websocketpp::lib::placeholders::_2)); g_wsEndPoint.connect(pConnection); return 0; } void close(websocketpp::close::status::value code, std::string reason) {websocketpp::lib::error_code ec; g_wsEndPoint.close(g_wsClientConnection->get_hdl(), code, reason, ec); if (ec) {std::cout << "> Error initiating close: " << ec.message() << std::endl; } } void websocket_endpoint::close() {if (g_wsClientConnection->get_status()=="Open"){int close_code = websocketpp::close::status::normal; kagula::close(close_code, ""); } } void websocket_endpoint::send(std::string message) {websocketpp::lib::error_code ec; g_wsEndPoint.send(g_wsClientConnection->get_hdl(), message, websocketpp::frame::opcode::text, ec); if (ec) {std::cout << "> Error sending message: " << ec.message() << std::endl; return; } g_wsClientConnection->record_sent_message(message); } void websocket_endpoint::show() {std::cout << * g_wsClientConnection << std::endl; }}

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