在Qt中获取本地IP地址

Question

有没有一种跨平台的方法可以使用Qt获取计算机的本地IP地址（即看起来像192.168.1.49的东西）？

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

Answer 1

Use QNetworkInterface：：allAddresses（）

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

Answer 2

QNetworkInterface::allAddresses()会给你网络地址。 然后，您可以将结果筛选为不是环回地址的 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();
  }

Answer 3

如果您需要的信息不仅仅是 IP 地址（如子网），则必须遍历所有接口。

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();
    }
}

Answer 4

QNetworkInterface 返回大量地址。 您必须过滤它们才能获得所需的结果：

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();
        }
    }
}

Answer 5

这是我实现的代码：本地主机的名称，IP，网络掩码和mac地址。

   QString localhostname =  QHostInfo::localHostName();
   QString localhostIP;
   QList<QHostAddress> hostList = QHostInfo::fromName(localhostname).addresses();
   foreach (const QHostAddress& address, hostList) {
       if (address.protocol() == QAbstractSocket::IPv4Protocol && address.isLoopback() == false) {
            localhostIP = address.toString();
       }
   }
   QString localMacAddress;
   QString localNetmask;
   foreach (const QNetworkInterface& networkInterface, QNetworkInterface::allInterfaces()) {
       foreach (const QNetworkAddressEntry& entry, networkInterface.addressEntries()) {
           if (entry.ip().toString() == localhostIP) {
               localMacAddress = networkInterface.hardwareAddress();
               localNetmask = entry.netmask().toString();
               break;
           }
       }
   }
   qDebug() << "Localhost name: " << localhostname;
   qDebug() << "IP = " << localhostIP;
   qDebug() << "MAC = " << localMacAddress;
   qDebug() << "Netmask = " << localNetmask;

Answer 6

我想

获取目标机器eth1 IP地址。上面提供的答案帮助我得到了我想要的东西：这就是我编写函数的方式，以获取网络接口名称的 IP 地址eth1。

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