QT. Socket Client.

socketclient.cpp

/*
Connecting to a TCP socket server.
*/

//Create the socket object.
QTcpSocket *socket = new QTcpSocket(this);

//tap into the socket signals with some local methods.
//status signals
connect(socket, SIGNAL(connected()), this, SLOT(connected()));
connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));
// I/O signals
connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
connect(socket, SIGNAL(bytesWritten(qint64)), this, SLOT(bytesWritten(qint64)));
//error handling signal
connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(socketError(QAbstractSocket::SocketError)));

//connect to the server.
socket->connectToHost(hostIp, port);

//Wait for connection up to 3000 ms. Failed if timeout.
if(!socket->waitForConnected(3000)){
   qDebug() << "Error connecting: " << socket->errorString();
   emit connectionError();
}


/*
Receive message.
*/
void SocketClient::readyRead(){
    //get the data 
    QByteArray buffer = socket->readAll();
  
    //do something with the data
    //...
}

/*
Send some data
*/
qint64 SocketClient::sendData(QByteArray msg){
    qint64 bytesSent = socket->write(msg);
}