Question

是否有跨平台方式使用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FTP服务器，我想显示FTP客户端应该连接的IP地址。

Answer 1

使用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()会为您提供网络地址。然后，您可以将结果过滤为非回送地址的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();

  }

Answer 3

如果您需要的信息不仅仅是IP地址（如子网），您必须遍历所有接口。

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。你必须过滤它们才能获得理想的结果：

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();
        }
    }
}

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

我想获得目标计算机的$(document).ready(function() { **//I create dataTable 1** var table = $('#example').DataTable({ "language": { "url": "//cdn.datatables.net/plug-ins/9dcbecd42ad/i18n/Spanish.json" }, "dom": '<"toolbar">frtip' }); **//I create dataTable 2** var table2 = $('#example2').DataTable({ "language": { "url": "//cdn.datatables.net/plug-ins/9dcbecd42ad/i18n/Spanish.json" }, "dom": '<"toolbar">frtip' }); **//I load dataTable 1** $('#example tbody').on( 'click', 'tr', function () { if ( $(this).hasClass('selected') ) { $(this).removeClass('selected'); }else{ table.$('tr.selected').removeClass('selected'); $(this).addClass('selected'); var getted = table.row('.selected').data(); $.ajax({ type:'POST', data: 'usuario=' + getted, url: 'loadF1.php', success: function(msg) { $('#example2 tbody').html(msg); //Here set content into div2 } }); **//I load dataTable 2** $('#example2 tbody').on( 'click', 'tr', function () { if ( $(this).hasClass('selected') ) { $(this).removeClass('selected'); }else{ table2.$('tr.selected').removeClass('selected'); $(this).addClass('selected'); var getted2 = table2.row('.selected').data(); $.ajax({ type:'POST', data: 'usuario=' + getted2, url: 'loadF2.php', success: function(msg) { $('#example3 tbody').html(msg); //Here set content into div3 } }); IP地址。上面提供的答案帮助我得到了我想要的东西：这就是我编写函数以获取网络接口名称eth1的IP地址的方式。

eth1

在Qt中获取本地IP地址

6 个答案: