NTP Client library

mrdebug

Can someone suggest me a cross platform (Linux - Windows) library to have the ntp time from a server?
Regards.

koahnig

mrdebug

I have bring up this synchronized function that can be used inside a thread.

// https://github.com/edma2/ntp/blob/master/rfc.txt
bool GetNTPDateTime(QDateTime &DateTime, QString Server, int Socket) {
    bool Result= false;
    QHostInfo HostInfo= QHostInfo::fromName(Server);
    if (HostInfo.addresses().length()> 0) {
        QUdpSocket *UdpSocket= new QUdpSocket(); {
            UdpSocket->connectToHost(QHostAddress(HostInfo.addresses().at(0)), Socket);
            char Message[48]= {010, 0, 0, 0, 0, 0, 0, 0, 0};
            if (UdpSocket->writeDatagram(Message, sizeof(Message), QHostAddress(HostInfo.addresses().at(0)), Socket)== sizeof(Message)) {
                if (UdpSocket->waitForReadyRead()) {
                    while (UdpSocket->hasPendingDatagrams()) {
                        QByteArray QBABufferIn= UdpSocket->readAll();
                        if (QBABufferIn.size()== 48) {
                            int count= 40;
                            unsigned long DateTimeIn= uchar(QBABufferIn.at(count))+ (uchar(QBABufferIn.at(count+ 1)) << 8)+ (uchar(QBABufferIn.at(count+ 2)) << 16)+ (uchar(QBABufferIn.at(count+ 3)) << 24);
                            long tmit= ntohl((time_t)DateTimeIn);
                            tmit-= 2208988800U;
                            DateTime= QDateTime::fromTime_t(tmit);
                            Result= true;
                        }
                    }
                }
            }
        }{
            delete UdpSocket;
        }
    }
    return Result;
}

What about it? I hope to do not have problem with it at the customers.

koahnig

@mrdebug

looks like you have a couple of paranthesis too much (see around delete UdpSocket). If it is sufficient for your purpose it is fine.