QT编程：获取本地IP和客户端IP

获取本地IP

void MainWindow::get_local_Ip()
{
    QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
    // use the first non-localhost IPv4 address
    QString ipAddress;
    for (int i = 0; i < ipAddressesList.size(); ++i) {
        qDebug()<<ipAddressesList.at(i);
        if (ipAddressesList.at(i) != QHostAddress::LocalHost &&
            ipAddressesList.at(i).toIPv4Address()) {
            ipAddress = ipAddressesList.at(i).toString();
            break;
        }
    }
    // if we did not find one, use IPv4 localhost
    if (ipAddress.isEmpty())
        ipAddress = QHostAddress(QHostAddress::LocalHost).toString();
    qDebug()<<"IP为："<<ipAddress;
}

获取客户端IP

myser =  new QTcpServer(this);
//2.监听服务器对象
if(myser->listen(QHostAddress::Any,6666))
{
    qDebug() << "绑定并监听成功\n";
}
else
{
    qDebug() << "绑定并监听失败\n";
}

//3.关联链接请求信号
connect(myser,SIGNAL(newConnection()),this,SLOT(new_connect()));
this->setWindowTitle("服务器");

//新的链接槽函数
void MainWindow::new_connect()
{
    
     qDebug() << "有新的客户端链接进来\n";
         //接收客户端的链接请求
     QTcpSocket *clien = new QTcpSocket(this);;

     clien = myser->nextPendingConnection();
     QString ip = clien->peerAddress().toString();
     QString port = QString::number(clien->peerPort());
     QString all = ip + ":" + port;
     all = all.remove(0, 7);//客户端IP及端口号
      connect(clien,SIGNAL(readyRead()),this,SLOT(show_data()));

        //往客户端中写入5个字节的数据
       clien->write("hello",5);
}