tcp listen and receive text

pauledd

Hi there,
I have written a small Android app that sends an url link to a specified ip/port in my lan. The url is followed by a newline (\n).

So far that works. If I run:

ncat -k -l 192.168.1.100 6666

on my Desktop Pc I can receive every url that I sent over the app.

Now I want a Qt application that does the same instead of ncat.

I wrote this little code but everytime I send the url the "newConnection" function gets called but appearently I dont get any bytes:

MyServer::MyServer(QObject *parent)
{
   server = new QTcpServer(this);
   connect(server,&QTcpServer::newConnection,this,&MyServer::newConnection);

   if(!server->listen(QHostAddress::Any,6666))
   {
       qDebug() << "Server could not start!";
   }
   else
   {
       qDebug() << "Server started!";
   }
}

void MyServer::newConnection()
{
    QTcpSocket *socket = server->nextPendingConnection();
    if(socket->bytesAvailable())
    {
        qDebug() << socket->readAll();
    }
}

I also tried with:

qDebug() << socket->bytesAvailable()

and that gives me back always 0.
Can someone give me a hint what I am doing wrong?

VRonin

You have to wait for readyRead before reading.

void MyServer::newConnection()
{
    QTcpSocket *socket = server->nextPendingConnection();
QObject::connect(socket,&QTcpSocket::readyRead,this,[socket]()->void{
    if(socket->bytesAvailable())
    {
        qDebug() << socket->readAll();
    }
});
}

pauledd

great! works. Thanks a lot.