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void Server::sendToClient()
{
    QTcpSocket *clientSocket = (QTcpSocket*)sender();
    QByteArray arr;
    QBuffer buffer(&arr);
    buffer.open(QIODevice::WriteOnly);

    QPixmap pix(200, 200);
    pix.fill(Qt::red);

    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_0);
    out << quint16(0) << arr << QPoint(23, 23);

    out.device()->seek(0);
    out << quint16(block.size() - sizeof(qint16));

    clientSocket->write(block);
}

void Client::readyRead()
{
    QDataStream in(_tcpSocket);
    in.setVersion(QDataStream::Qt_4_0);

    while(1) {
        if (!_blockSize) {
            if (_tcpSocket->bytesAvailable() < sizeof(quint16)) {
                break;
            }
            in >> _blockSize;
        }
        if (_tcpSocket->bytesAvailable() < _blockSize) {
            break;
        }

        QByteArray buf;
        QPoint pt;
        in >> buf >> pt;

        _blockSize = 0;
    }
}