Qt serialization example

serialize.cpp

#include <QtCore/QCoreApplication>

#include <qdatastream.h>
#include <qvector3d.h>
#include <qdebug.h>
#include <qtcpserver.h>
#include <qtcpsocket.h>

int main(int argc, char* argv[])
{
	QCoreApplication a(argc, argv);

	QByteArray packed_msg;
	QDataStream serializer(&packed_msg, QIODevice::WriteOnly);

	QList<QVector3D> points_3d_send;

	points_3d_send << QVector3D(1, 1, 1);
	points_3d_send << QVector3D(2, 2, 2);
	points_3d_send << QVector3D(3, 3, 3);

	serializer << points_3d_send;

	// <= send packed_msg over network
	QTcpSocket clientSocket;
	QDataStream to_server_stream(&clientSocket);

	clientSocket.connectToHost(QHostAddress::LocalHost, 1122);

	to_server_stream << packed_msg;

	qDebug() << "sent:\n" << points_3d_send;

	// <= receive packed_msg over network
	QTcpServer tcp_server;

	QObject::connect(&tcp_server, &QTcpServer::newConnection, [&tcp_server]() {
		QTcpSocket* clientSocket = tcp_server.nextPendingConnection();

		QObject::connect(clientSocket, &QAbstractSocket::readyRead, [clientSocket]() {
			QDataStream from_client_stream(clientSocket);
			QByteArray packed_msg;

			// check if QByteArray is complete
			from_client_stream.startTransaction(); 
			from_client_stream >> packed_msg; // try to read QByteArray

			// if QByteArray is not completely received -> repeat when more data arrives
			if (!from_client_stream.commitTransaction()) { 
				return; // wait till more data arives
			}

			// QByteArray received completely -> deserialize data
			QDataStream deserializer(packed_msg);

			QList<QVector3D> points_3d_receive;
			deserializer >> points_3d_receive;

			qDebug() << "\nreceived:\n" << points_3d_receive;
		});
	});

	tcp_server.listen(QHostAddress::LocalHost, 1122);

	return a.exec();
}