void send_data(){
QTcpSocket tcpSocket;
tcpSocket.connectToHost("localhost", 1234);
tcpSocket.write("Hello World");
tcpSocket.waitForBytesWritten();
tcpSocket.close();
}
void receive_data(){
QTcpSocket tcpSocket;
tcpSocket.connectToHost("localhost", 1234);
tcpSocket.waitForReadyRead();
QString data = tcpSocket.readAll();
cout << data.toStdString() << endl;
tcpSocket.close();
}