How can a QWebSocketServer identify messages from multiple HTML clients and answer each separately?
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Refer to "Qt WebChannel Standalone Example"
Step 1: setup the QWebSocketServerm_server = new QWebSocketServer("WebSocket app", QWebSocketServer::NonSecureMode, this); if (!m_server->listen(QHostAddress::LocalHost, 12345)) { qFatal("Failed to open web socket server, probabaly caused by an existing instance!"); return; }
Step 2: setup the channel
m_channel = new QWebChannel(this); // setup the core and publish it to the QWebChannel m_channel->registerObject(QStringLiteral("core"), m_jsHelper); connect(m_server, SIGNAL(newConnection()), this, SLOT(newConnection()));
Step 3: handle incoming socket
void MainWindow::newConnection() { QWebSocket *socket = m_server->nextPendingConnection(); QWebChannelAbstractTransport *t = new WebSocketTransport(socket); m_channel->connectTo(t); connect(t, SIGNAL(messageReceived(QJsonObject,QWebChannelAbstractTransport*)), this, SLOT(messageReceived(QJsonObject,QWebChannelAbstractTransport*))); }
Step 4: open two browsers, both load same index.html, which contains a connection from C++ signal trigger to a JavaScript function:
core.sendText.connect(function(message) {// sendText is a C++ signal output("Received message: " + message); });
In this way, one server emits one sendText message which will display in multiple browser clients.
My question is each client can send its own question to the server, is there a way the server can answer each client separately and only? -
Here is source code repository
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Solved by 1) when a new client comes in, store WebSocketTransport in a list. 2) upon WebSocketTransport::textMessageReceived() trigger MainWindow::messageReceived() where indexing m_currentTransport. 3) Instead of sentText() use m_currentTransport->sendPlainTextMessage(text); to reply.
Source code detail: git clone https://Lingfa@bitbucket.org/Lingfa/htmlchat.git