Client/server application

[sali555]

hi everyone,

i am writing a network application and have one problem. I have server and two clients. The first client send message to server, when this message comes to server, the server send other message to the second client but I dont know how can I do that.

I have this function, which send data to client

void MainWindow::writeData(QTcpSocket* socket, QByteArray data)
{
socket->write(data);
socket->flush();
}

The first client send message START, the second send "FINISH"
When message FINISH comes, I want to send message HELLO to the client, which sended message START.

sorry about my english

[squidge]

So you know how to send data.

Do you know how to receive data? If so, what is the problem? Post your code and point to the part which isn't working.

[sali555]

yes I know how send/recieve data, but I dont know how find right socket.

server.cpp


void MainWindow::startServer()
{
server = new QTcpServer(this);
QObject::connect(server, SIGNAL(newConnection()),this, SLOT(acceptConnection()));
server->listen();
}

void MainWindow::acceptConnection()
{
QTcpSocket* socket = server->nextPendingConnection();
connect(socket, SIGNAL(readyRead()), SLOT(startRead()));
}

// IN THIS FUNCTION I HAVE PROBLEM!!!!
void MainWindow::startRead()
{
QTcpSocket* socket = qobject_cast<QTcpSocket*>(this->sender());
QByteArray rawdata = socket->readAll();

if(rawdata == "FINISHREADY")
{
// PROBLEM
// the first parameter in this function must be a socket from which comes message
// STARTREADY
// and I dont know how find right socket

zapsat(start, "READY");
}
}

//write data to socket
void MainWindow::writeData(QTcpSocket* socket, QByteArray data)
{
socket->write(data);
socket->flush();
}

[squidge]

So you need to store the socket pointer when you accept the connection. Where you store it is up to you.

[sali555]

yes this is it, but i dont khow how to do. How to store socket pointer? I didnt find any method.

[squidge]

Your already storing it in local scope (QTcpSocket* socket), what you need to do is store it in a more global scope, such as in your class. Just assign, eg. clientSock = socket;