How to find other machine's IP Address in Qt ??

ankursaxena

Hi All,

I just want to know how to find ip Adrress of another machine programmatically in Qt.

Any help will be appreciated.
Thanx in Advance.

Binary91

Hi,
are you working with sockets? You have to catch the signal newConnection() for incoming connections and get the new QTcpSocket (nextPendingConnection()).
With the QTcpSocket you can get the adress via peerAddress()...

ankursaxena

Thank you @Binary91 for your response.

I tried using sockets. but it takes sometime to find out all the address in a network.

Then I combined sockets with multithreading to get the ip adress quickly. but In case if there are thousands of system , this procedure will take a lot of CPU usage and RAM. So I want to minimize it also.

So Is there any other method to achieve this ?

Salvatello

check this QNetworkInterface

ankursaxena

I have used QNetworkInterface class but it is not very helpful as i needed to ipaddress of other machine or say (ip address of) all machines.

Salvatello

you can try:

@// Send a broadcast packet on all interfaces
void DuktoProtocol::sendToAllBroadcast(QByteArray *packet)
{
// Get network interfaces list
QList<QNetworkInterface> ifaces = QNetworkInterface::allInterfaces();

// Interfaces iteration
for (int i = 0; i < ifaces.size(); i++)
{
    // Now get all IP addresses for the current interface
    QList<QNetworkAddressEntry> addrs = ifaces[i].addressEntries();

    // And for any IP address, if it is IPv4 and the interface is active, send the packet
    for (int j = 0; j < addrs.size(); j++)
        if ((addrs[j].ip().protocol() == QAbstractSocket::IPv4Protocol) && (addrs[j].broadcast().toString() != ""))
            mSocket->writeDatagram(packet->data(), packet->length(), addrs[j].broadcast(), UDP_PORT);
}

}@

ankursaxena

Thank u @Salvatello for posting the code.
I tried it but unfortunately it is not providing required output.

This code is providing all kind of local Address of hosting machine.

ankursaxena

Hi andreyc!! Thank u for your reply.

As your suggestion, I am searching for mayne library on Windows. Will you please provide me the link for mayne libary.

Thank you.