Qt之获取本机网络信息（MAC, IP等等，很全）

经常使用命令行来查看一些计算机的配置信息。

1.首先按住键盘上的“开始键+R键”，然后在弹出的对话框中输入“CMD”，回车
另外，还可以依次点击 开始>所有程序>附件>命令提示符
2.接下来在弹出的命令提示符窗口中输入“ipconfig /all”并按键盘上的回车，(注：ipconfig 命令为查看IP配置信息，参数“all”表示查看所有网卡的全部配置信息）
如下图所示：





那么，在Qt中如何获取主机名、IP、端口、MAC等信息？
主要使用到的类有：

QHostInfo

QHostAddress

QNetworkInterface

QNetworkAddressEntry

1.获取登录用户

QString name = qgetenv("USERNAME");
qDebug() << "User Name:" << name;

输出：
User Name: "wangl-d"

2.获取主机名、IP地址

//QHostInfo类作用，获取主机名，也可以通过主机名来查找IP地址，或者通过IP地址来反向查找主机名。
QString localHostName = QHostInfo::localHostName();
qDebug() << "LocalHostName:" << localHostName;

//获取IP地址
QHostInfo info = QHostInfo::fromName(localHostName);
qDebug() << "IP Address:" << info.addresses();

foreach(QHostAddress address, info.addresses())
{
if (address.protocol() == QAbstractSocket::IPv4Protocol)
qDebug() << "IPv4 Address:" << address.toString();
}

foreach (QHostAddress address, QNetworkInterface::allAddresses())
{
qDebug() << "Address:" << address;
}

输出：

LocalHostName: "wangl-d-pc"

IP Address: (QHostAddress("fe80::396e:183d:aac6:f7f2") , QHostAddress( "192.168.118.55" ) )

IPv4 Address: "192.168.118.55"

Address: QHostAddress( "fe80::396e:183d:aac6:f7f2" )

Address: QHostAddress( "192.168.118.55" )

Address: QHostAddress( "::1" )

Address: QHostAddress( "127.0.0.1" )

Address: QHostAddress( "fe80::5efe:c0a8:7637" )

Address: QHostAddress( "fe80::e0:0:0:0" )

3.获取设备名、MAC地址、子网掩码、广播地址等

//获取所有网络接口的列表
foreach (QNetworkInterface netInterface, QNetworkInterface::allInterfaces())
{
//设备名
qDebug() << "Device:" << netInterface.name();

//MAC地址
qDebug() << "HardwareAddress:" << netInterface.hardwareAddress();

QList entryList = netInterface.addressEntries();

//遍历每一个IP地址(每个包含一个IP地址，一个子网掩码和一个广播地址)
foreach(QNetworkAddressEntry entry, entryList)
{
//IP地址
qDebug() << "IP Address:" << entry.ip().toString();

//子网掩码
qDebug() << "Netmask:" << entry.netmask().toString();

//广播地址
qDebug() << "Broadcast:" << entry.broadcast().toString();
}
}

输出：

Device: "{4C5C2613-C18F-416A-A21F-47B707C3B935}"

HardwareAddress: "74:D4:35:1B:A6:2F"

IP Address: "fe80::396e:183d:aac6:f7f2"

Netmask: "ffff:ffff:ffff:ffff::"

Broadcast: ""

IP Address: "192.168.118.55"

Netmask: "255.255.255.0"

Broadcast: "192.168.118.255"

Device: "{846EE342-7039-11DE-9D20-806E6F6E6963}"

HardwareAddress: ""

IP Address: "::1"

Netmask: "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"

Broadcast: ""

IP Address: "127.0.0.1"

Netmask: ""

Broadcast: ""

Device: "{539F3167-F67C-432D-8904-34129F3F5521}"

HardwareAddress: "00:00:00:00:00:00:00:E0"

IP Address: "fe80::5efe:c0a8:7637"

Netmask: "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"

Broadcast: ""

Device: "{5DECB4C5-20AC-4BD6-A685-9FE608ED6EF5}"

HardwareAddress: "00:00:00:00:00:00:00:E0"

IP Address: "fe80::e0:0:0:0"

Netmask: "ffff:ffff:ffff:ffff::"

Broadcast: ""
http://blog.sina.com.cn/s/blog_a6fb6cc90102v0mz.html