.cpp

void Server::sendTextToAll(QString text,ClientThread* except){
    QByteArray block;
    QDataStream out(&block,QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_8);

    out << (quint32)0 << text;

    out.device()->seek(0);
    out << (quint32)(block.size() - sizeof(quint32));
    qDebug() << "block.size() = " << block.size();

    qint64 x = 0;
    foreach(ClientThread* eachClient,clientThreadList){
        if(except != NULL && eachClient == except)
            continue;
        x = 0;
        while(x < block.size()){
            qint64 y = eachClient->getTcpSocket()->write(block);
            x+=y;
            qDebug() << eachClient->getUsername()<< "/sent" << x ;
        }
        qDebug() << "-----";
    }
}