<Solved> TCP client read wrong data from server

Vitek

Hi, i created tcp server and client. Server send data to clients, but client read wrong data. Please help me.

This slot conneted with signal readyRead() at a client.


void Client::readSocketData()
{
    QDataStream in(m_socket);
    while(true)
    {
        if (m_nextBlockSize == 0)
        {
            if (m_socket->bytesAvailable() < sizeof(quint16(0)))
                return;
            in >> m_nextBlockSize;
            qDebug() << m_nextBlockSize;
        }
        if (m_socket->bytesAvailable() < m_nextBlockSize)
        {
            return;
        }
        QString text;
        in >> text;
        qDebug() << text;
        m_nextBlockSize = 0;
    }
}

client class for server

ClientConnection::ClientConnection(int socketDescriptor, QObject *parent) : QThread(parent),
    m_socketDescriptor(socketDescriptor)
{
 
}
 
void ClientConnection::writeData(const QString& text)
{
    QByteArray rawData;
    QDataStream data(&rawData, QIODevice::ReadWrite);
    data << quint16(0) << text;
    data.device()->seek(0);
    data << quint16(rawData.size() - sizeof(quint16));
 
    m_socket->write(rawData);
    m_socket->waitForBytesWritten();
}
 
void ClientConnection::run()
{
    qDebug() << "New connection";
    m_socket = new QTcpSocket();
    m_socket->setSocketDescriptor(m_socketDescriptor);
}

Class Server


MyServer::MyServer(QObject *parent) : QTcpServer(parent)
{
    if(!this->listen(QHostAddress::Any, 1234))
    {
        qDebug() << "Could not start server";
    }
    else
    {
        qDebug() << "Listening...";
    }
}
 
void MyServer::sendText(const QString &text)
{
    for(int i = 0; i < m_connections.size(); ++i)
    {
        m_connections.at(i)->writeData(text);
    }
}
 
void MyServer::incomingConnection(int handle)
{
    ClientConnection *client = new ClientConnection(handle);
    client->start();
    m_connections.push_back(client);
}

SGaist

Hi,

What do you mean by wrong data ? What do you expect ? What do you get ?

Vitek

Thank for reply.
I solve my problem. i sent my block size as quint16 but i read as int.

SGaist

Nice you found out and thanks for sharing :)

There's no need to modify the title anymore to mark the thread as solved, you can use the "Topic Tool" button for that :)