C++ WebSocket::sendFrame方法代码示例

 void sendTextFrame(WebSocket& ws, const std::string& s)
 {
     ws.sendFrame(s.data(), s.size());
 }

//.........这里部分代码省略.........

		


		// get response
		HTTPResponse res;
		istream& is = session.receiveResponse(res); // stream the request
		cout << res.getStatus() << " " << res.getReason() << endl; // get the status code of the transaction

		// convert the istream to sting for further processing
		istreambuf_iterator<char> eos;
		string s(istreambuf_iterator<char>(is), eos);

		const char * cc = s.c_str();
		// instantiate a rapidjson document and fill it up with the response of the negotiation request
		rapidjson::Document document; 
		document.Parse<0>(cc); 
		string token = document["ConnectionToken"].GetString(); // parse the response and get the connectionToken

		//=============================================

		//connect to signarR using the connectionToken got previously
		HTTPClientSession cs(signalr_service_url, signalr_service_port); // instantiate simple webclient
		string what = "/" + signalr_url_endpoint + "/connect?transport=webSockets&connectionToken=" + urlencode(token) + "&UID=" + my_mac + "&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D&tid=10"; // compose the request string
		HTTPRequest request(HTTPRequest::HTTP_GET, what, "HTTP/1.1"); // the protocol MUST be HTTP/1.1, as described in RFC6455; else the UPGRADE to websocket request will fail
		request.set("Host", signalr_service_url); // specify the Host header to be sent
		HTTPResponse response; // instantiate a http response
		cout << response.getStatus() << " " << response.getReason() << endl;
		WebSocket * ws = new WebSocket(cs, request, response); // instantiate a WebSocket transaction to the 'cs' session, sending the 'request' and storing the 'response'

		//sample of a message to be sent
		payload = "{\"H\":\"myhub\",\"M\":\"Send\",\"A\":[\"" + my_mac + "\",\"invoked from " + replaceInPlace(my_mac, std::string(":"), std::string("-")) + " client\"],\"I\":0}";
		// cout << endl << payload << endl ;
		ws->sendFrame(payload.data(), payload.size(), WebSocket::FRAME_TEXT); // send the message to signalR using the payload and setting the type of frame to be sent as FRAME_TEXT

		flags = 1;
		// starting the receiving loop
		while( (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE ) // while websocket session open
		{
			n = ws->receiveFrame(buffer, sizeof(buffer), flags); // n is the received frame
			// flags store the response flags of the frame
			// 129 = single frame response
			// 1   = start of multi-frame response
			// 0   = continuation frame of a multi-frame response
			// 128 = FIN frame os a multi-frame response

			// signalR send data in JSON format, and it send empty messages (empty json document) on a regular basis

			if( (n != 2) && flags !=1 ) // filter out empty jsons and multiframe responses (multiframe will be treated further on)
			{
				cout << "RCV[" << msg_cnt << "]=>	" << buffer << " ===== " << unsigned(flags) << endl;
			}

			if(flags == 1){ // if I get a start frame of a multi-frame response means that I am getting something usefull from signalR
				string str(buffer);
				out += str;
				// due to flag == 1, we are expecting several frames, until we got flag == 128
				do{
					n = ws->receiveFrame(buffer, sizeof(buffer), flags);
					string str(buffer);
					out += str; // we add the next frame/frames to the out variable, to construct the whole JSON message
					str = "";
					memset(buffer, 0, sizeof buffer); // be sure to empty the buffer to don't end up with junk
				}while(flags != 128);
				cout << endl << "=> " << out << endl;