Qt WebSocket

宣告 WebSocketServer
new QWebSocketServer("Web Server", QWebSocketServer::NonSecureMode, this)

使用 listen() 開始接受 client 連線

同樣是使用 newConnection() 接受新的 client 事件
使用 nextPendingConnection() 取得 client 的 socket

QWebSocket 使用 disconnected 斷線事件

因為 WebSocket 規範中有兩種資料傳送方式，純文字模式及二進制模式，
所以資料接收事件也分為兩種，分別為
textMessageReceived，參數為 QString message
binaryMessageReceived，參數為 QByteArray message

傳送資料也分為兩個函式，分別為
sendTextMessage
sendBinaryMessage

簡單範例

connect(m_pWebSocketServer, &QWebSocketServer::newConnection, [=]() {
qDebug() << "new client socket";

QWebSocket* socket = this->m_pWebSocketServer->nextPendingConnection();

connect(socket, &QWebSocket::disconnected, [=]() {
qDebug() << "client socket disconnected";

socket->deleteLater();
});

connect(socket, &QWebSocket::textMessageReceived, [=](QString message) {
qDebug() << "client textMessageReceived";

qDebug() << "Read: " << message;
qDebug() << "Send " << message;

socket->sendTextMessage(message);
socket->close();
});

connect(socket, &QWebSocket::binaryMessageReceived, [=](QByteArray message) {
qDebug() << "client processBinaryMessage";

qDebug() << "Read: " << message;
qDebug() << "Send " << message;

socket->sendBinaryMessage(message);
socket->close();
});
});

m_pWebSocketServer->listen(QHostAddress::Any, 8812);

資料來源
Echo Server Example
http://doc.qt.io/qt-5/qtwebsockets-echoserver-example.html

QWebSocketServer
http://doc.qt.io/qt-5/qwebsocketserver.html

Qt TcpSocket

Server 的部份使用 QTcpServer

呼叫 listen 函式開始接受 Client 連線，參數為 QHostAddress::Any, 8811

在 newConnection signal 接受 socket

QTcpSocket* socket = server->nextPendingConnection();

在 readyRead() signal 接收資料

QBtyeArray data = socket->readyAll()

使用 write() 傳送資料

簡單的範例：

  m_server = new QTcpServer();
connect(m_server, &QTcpServer::newConnection, [=]() { qDebug() << "new client socket"; QTcpSocket* socket = this->m_server->nextPendingConnection(); connect(socket, &QTcpSocket::disconnected, [=]() { qDebug() << "client socket disconnected"; socket->deleteLater(); }); connect(socket, &QTcpSocket::readyRead, [=]() { qDebug() << "client readyRead"; QString string = socket->readAll(); qDebug() << "Read: " << string; string = string.toUpper(); qDebug() << "Send " << string; socket->write(string.toLatin1()); socket->close(); }); }); m_server->listen(QHostAddress::Any, 8811); qDebug() << "server listen";


Client 直接使用 QTcpSocket

呼叮 connectToHost 與 server 連線
連上了會觸發 connected 訊號，斷線則是 disconnected
接收資料一樣是 readyRead

簡單的範例：

m_client = new QTcpSocket();

connect(m_client, &QTcpSocket::connected, [=]() {
qDebug() << "socket connected";

QString string = "Hi";
m_client->write(string.toLatin1());
qDebug() << "Send: " << string;
});

connect(m_client, &QTcpSocket::disconnected, [=]() {
qDebug() << "socket disconnected";
});

connect(m_client, &QTcpSocket::readyRead, [=]() {
qDebug() << "client readyRead";

QString string = m_client->readAll();
qDebug() << "Read: " << string;

m_client->close();
});

m_client->connectToHost("127.0.0.1", 8811);


資料來源：
Network Programming with Qt
http://doc.qt.io/qt-5/qtnetwork-programming.html

Sockets - Server & Client using QT
http://www.bogotobogo.com/cplusplus/sockets_server_client_QT.php

QTcpSocket Class
http://doc.qt.io/qt-5/qtcpsocket.html