server doesn't read data from client using QTcpsocket

Noshad

hi everyone

i want to design a mullti thread chat server and client.

first thing that i want to do is to send username to the server and server save it beside socketDescriptor so when i want to find clients sockets i can do it with their usenames

but the problem is that server cant read username.

i have a button that when i press it i want username to be send and socket to connect.
(consider that i use datastream because i migh want to send images too)

here is my code in client side:

void MainWindow::on_pushButton_clicked()
{

username = ui->lineEdit_2->text();
ui->lineEdit_2->clear();

QByteArray block;
QDataStream out(&block,QIODevice::WriteOnly);
out<<quint16(0);
out<<username;
out.device()->seek(0);
out<<quint16(block.size() - (int)sizeof(quint16));

socket->write(block);


socket->connectToHost(QHostAddress::LocalHost,6400);

ui->stackedWidget->setCurrentIndex(0);

}

and my server code to read it is:

void MyServer::incomingConnection(qintptr socketDescriptor)
{
qDebug() << socketDescriptor << " Connecting...";

/*begin:here we have to get username*/
    /*note that client have to send username as soon as its connected*/
int blockSize;
QTcpSocket client;
client.setSocketDescriptor(socketDescriptor);
QDataStream in(&client);
QString username;
in >> blockSize;

while(true)
{
    if(client.bytesAvailable() == blockSize)
    {
        in >> username;
        qDebug() <<"\nuser " <<username <<"has joined chat\n\n";
        break;
    }
}

users->insert(username,socketDescriptor);

/*end*/


// Every new connection will be run in a newly created thread
ThreadClient *thread = new ThreadClient(socketDescriptor, this);

// connect signal/slot
// once a thread is not needed, it will be beleted later
connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));

thread->start();

}

tnx

mcosta

@Noshad said:

socket->write(block);

socket->connectToHost(QHostAddress::LocalHost,6400);

Hi and welcome to devnet,

you're sending data before connect to the server.

I suggest to check the return value of each socket operation to verify the success; also many Q*Socket methods are asynchronous (the returns immediately without waiting for the operation completion).