C++ 在 Qt 中获取本地 IP 地址
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Get local IP address in Qt
提问by sashoalm
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?
有没有一种跨平台的方法来192.168.1.49使用 Qt 获取计算机的本地 IP 地址（即看起来像的东西）？
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 手机建立一个 FTP 服务器，并且我想显示 FTP 客户端应该连接到的 IP 地址。
回答by benjarobin
Use QNetworkInterface::allAddresses()
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();
}
回答by Prasoon
QNetworkInterface::allAddresses()will give you the network addresses. You can then filter the results to IPv4 addresses that are not loopback addresses:
QNetworkInterface::allAddresses()会给你网络地址。然后，您可以将结果过滤到不是环回地址的 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();
}
回答by Dan
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（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();
}
}
回答by Hamed Nikzad
QNetworkInterface returns lots of addresses. you must filter them, to get desirable result:
QNetworkInterface 返回大量地址。你必须过滤它们，以获得理想的结果：
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();
}
}
}
回答by user2434119
Here is the code I implemented to get: name, IP, netmask and mac address of localhost.
这是我实现的代码：localhost 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;
回答by user12345
I wanted to get eth1IP 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eth1目标机器的 IP 地址。上面提供的答案帮助我得到了我想要的：这就是我编写函数以获取网络接口名称的 IP 地址的方式eth1。
QNetworkInterface eth1Ip = QNetworkInterface::interfaceFromName("eth1");
QList<QNetworkAddressEntry> entries = eth1Ip.addressEntries();
if (!entries.isEmpty()) {
QNetworkAddressEntry entry = entries.first();
qDebug() << entry.ip();
}
