Write contents of std::stringstream to a socket (or connect them)

[nomiz]

Dear all,

I have a question on using a std::stringstream to write to a QTcpSocket, so the contents will be transfered over the network connection.

I have a parent object:
A QObject with a private QTcpSocket attribute called socket.

When socket sends it readyRead() signal to parent, the parent creates a child (a QObject and QRunnable) and starts running its run();

Due to an API implementation, the child produces an std::stringstream output, which is the output of some calculation.

What could I do to take output (or contents of output) from child and give it to the parent, so parent can write its contents to the socket? Or maybe if connect socket->write() with output?

Thank you in advance for any hints!

Cheers

[nomiz]

Ok, that was easier then thought:
Apparently dup2() (never heard of it..) can redirect stdout and stderr to another (file or socket)descriptor (sorry, never heard of that either... ).

Whenever the QTcpServer gets an incoming connection, a incomingConnection(int handle) is emitted. This handle can be used in order to redirect all stdout ans stderr over a newly created socket.

void Server::incomingConnection(int handle)
{
    Client *client = new Client(this);
    client->setSocket(handle);
}

void Server::incomingConnection(int handle)
{
    Client *client = new Client(this);
    client->setSocket(handle);
}

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In client:

void Client::setSocket(int descriptor)
{
    socket = new QTcpSocket(this);
    socket->setSocketDescriptor(descriptor);
 
    dup2(descriptor, 1); // stdout
    dup2(descriptor, 2); // stderr
 
    qDebug() << "This text ends up at the telnet-session of the connected client";
 
    // connect socket signals to slots
    connect(socket, SIGNAL(connected()), this, SLOT(socketConnected()));
    connect(socket, SIGNAL(readyRead()), this, SLOT(socketReadyRead()));
 
    qDebug() << "Socket created";
}

void Client::setSocket(int descriptor)
{
    socket = new QTcpSocket(this);
    socket->setSocketDescriptor(descriptor);

    dup2(descriptor, 1); // stdout
    dup2(descriptor, 2); // stderr

    qDebug() << "This text ends up at the telnet-session of the connected client";

    // connect socket signals to slots
    connect(socket, SIGNAL(connected()), this, SLOT(socketConnected()));
    connect(socket, SIGNAL(readyRead()), this, SLOT(socketReadyRead()));

    qDebug() << "Socket created";
}

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