在Qt中获取本地IP地址

Is there a cross-platform way to get the local IP address (i.e. something that looks like 192.168.1.49) of the computer using Qt?

是否有跨平台的方式使用Qt获取计算机的本地IP地址(例如看起来像192.168.1.49)?

I want to make an FTP server for a Symbian phone and I want to show the IP address the FTP client should connect to.

我想为Symbian手机制作一个FTP服务器，我想显示FTP客户端应该连接的IP地址。

5 个解决方案

#1

Use QNetworkInterface::allAddresses()

使用QNetworkInterface::allAddresses()

foreach (const QHostAddress &address, QNetworkInterface::allAddresses()) {
    if (address.protocol() == QAbstractSocket::IPv4Protocol && address != QHostAddress(QHostAddress::LocalHost))
         qDebug() << address.toString();
}

#2

QNetworkInterface::allAddresses() will give you the network addresses. You can then filter the results to IPv4 addresses that are not loopback addresses:

alladdress()将为您提供网络地址。然后，您可以将结果过滤到非回送地址的IPv4地址:

QList<QHostAddress> list = QNetworkInterface::allAddresses();

 for(int nIter=0; nIter<list.count(); nIter++)

  {
      if(!list[nIter].isLoopback())
          if (list[nIter].protocol() == QAbstractSocket::IPv4Protocol )
        qDebug() << list[nIter].toString();

  }

#3

If you require more information than just IP addresses (like the subnet), you have to iterate over all the interfaces.

如果您需要的信息不仅仅是IP地址(比如子网)，那么您必须对所有接口进行迭代。

QList<QNetworkInterface> allInterfaces = QNetworkInterface::allInterfaces();
QNetworkInterface eth;

foreach(eth, allInterfaces) {
    QList<QNetworkAddressEntry> allEntries = eth.addressEntries();
    QNetworkAddressEntry entry;
    foreach (entry, allEntries) {
        qDebug() << entry.ip().toString() << "/" << entry.netmask().toString();
    }
}

#4

QNetworkInterface returns lots of addresses. you must filter them, to get desirable result:

QNetworkInterface返回很多地址。你必须过滤它们，以得到理想的结果:

foreach (const QNetworkInterface &netInterface, QNetworkInterface::allInterfaces()) {
    QNetworkInterface::InterfaceFlags flags = netInterface.flags();
    if( (bool)(flags & QNetworkInterface::IsRunning) && !(bool)(flags & QNetworkInterface::IsLoopBack)){
        foreach (const QNetworkAddressEntry &address, netInterface.addressEntries()) {
            if(address.ip().protocol() == QAbstractSocket::IPv4Protocol)
                qDebug() << address.ip().toString();
        }
    }
}

#5

I wanted to get eth1 IP address of my target machine. Answers provided above helped me to get what I wanted: This is how I wrote my function to get me the IP address of the network interface name eth1.

我想获取目标机器的eth1 IP地址。上面提供的答案帮助我得到了我想要的:这就是我如何编写函数来获得网络接口名称eth1的IP地址。

QNetworkInterface eth1Ip = QNetworkInterface::interfaceFromName("eth1");
QList<QNetworkAddressEntry> entries = eth1Ip.addressEntries();
if (!entries.isEmpty()) {
    QNetworkAddressEntry entry = entries.first();
    qDebug() << entry.ip();
}

#1