使用qt的hostInfo类，查看本机的IP和设备

创建NetWorkInformation类，main.cpp直接生成。

 #include "networkinformation.h"
 #include <QApplication>

 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     NetworkInformation w;
     w.show();

     return a.exec();
 }

头文件声明要写的槽函数，还有布局控件。

 #ifndef NETWORKINFORMATION_H
 #define NETWORKINFORMATION_H

 #include <QWidget>
 #include <QHostInfo>
 #include <QNetworkInterface>
 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
 #include <QGridLayout>
 class NetworkInformation : public QWidget
 {
     Q_OBJECT

 public:
     NetworkInformation(QWidget *parent = );
     ~NetworkInformation();
 public:
     void getHostInformation();
 public slots:
     void slotDetail();
 private:
     QLabel *hostLabel;
     QLineEdit *LineEditLocalHostname;
     QLabel * ipLabel;
     QLineEdit * LineEditAddress;
     QPushButton* detailBtn;
     QGridLayout * mainLayout;
 };

 #endif // NETWORKINFORMATION_H

最后是.cpp的文件。

在构造函数里写控件的布局，然后实现槽函数。

 #include "networkinformation.h"
 #include <QMessageBox>
 NetworkInformation::NetworkInformation(QWidget *parent)
     : QWidget(parent)
 {
    hostLabel = new QLabel("name:");
    LineEditLocalHostname = new QLineEdit;
    ipLabel = new QLabel(tr("ip:"));
    LineEditAddress = new QLineEdit;
    detailBtn = new QPushButton(tr("detail"));
    mainLayout =new QGridLayout(this);

    mainLayout->addWidget(hostLabel,,);
    mainLayout->addWidget(LineEditLocalHostname,,);
    mainLayout->addWidget(ipLabel,,);
    mainLayout->addWidget(LineEditAddress,,);
    mainLayout->addWidget(detailBtn,,,,);
    getHostInformation();
    connect(detailBtn,SIGNAL(clicked()),this,SLOT(slotDetail()));
 }

 NetworkInformation::~NetworkInformation()
 {

 }
 void NetworkInformation::getHostInformation()
 {
    QString localHostName = QHostInfo::localHostName();
    LineEditLocalHostname->setText(localHostName);

    QHostInfo hostinfo = QHostInfo::fromName(localHostName);

    foreach (const QHostAddress &address, hostinfo.addresses())
     {

         if (address.protocol() == QAbstractSocket::IPv4Protocol)
        {
         LineEditAddress->setText((address.toString()));
        }
     }
 }
 void NetworkInformation::slotDetail()
 {
     QString detail="";
    QList<QNetworkInterface>list=QNetworkInterface::allInterfaces();
     for(int i=;i<list.count();i++)
    {
       QNetworkInterface interface = list.at(i);
       detail= detail+tr("设备：")+interface.name()+"\n";
        detail= detail+tr("硬件地址：")+interface.hardwareAddress()+"\n";
        QList<QNetworkAddressEntry>entryList = interface.addressEntries();
       for(int j =;j<entryList.count();j++)
        {
          /QNetworkAddressEntry entry = entryList.at(i);
           detail = detail + "\t" +tr("IP 地址：")+entry.ip().toString()+"\n";
           detail = detail + "\t" + tr("子网掩码：")+entry.netmask().toString()+"\n";
           detail = detail + "\t" +tr("广播地址：") +entry.broadcast().toString()+"\n";
        }
     }
     QMessageBox::information(this,tr("Detail"),detail);
 }