PptAssistant/QT/KeyAssitant/Assistant/mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QTcpSocket"
#include "QTcpServer"
#include "myserver.h"
#include "QNetworkInterface"
#include "QHostInfo"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowFlags(windowFlags()& ~Qt::WindowMaximizeButtonHint);
    setFixedSize(214,155);
    ui->label->setText("<font color='red'>Assistant is closed</font>");
    udpSocket=new QUdpSocket(this);
    connect(udpSocket,  SIGNAL(readyRead()),this,SLOT(on_upd_received()));
    udpSocket->bind(5678);
}

MainWindow::~MainWindow()
{
    server.close();
    udpSocket->close();
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    if(started==0){
          server.StartServer();
          started=1;
          ui->pushButton->setText("CLOSE");
          ui->label->setText("<font color='green'>Assistant is running</font>");
    }else{
        server.close();
        started=0;
        ui->pushButton->setText("OPEN");
        ui->label->setText("<font color='red'>Assistant is closed</font>");
    }

}

void MainWindow::on_upd_received()
{
    while(udpSocket->hasPendingDatagrams())
    {
          QByteArray datagram;
          datagram.resize(udpSocket->pendingDatagramSize());
           udpSocket->readDatagram(datagram.data(),datagram.size());
           QString msg=datagram.data();
            qDebug()<<msg;
            QStringList request=msg.split(" ");
            if(request.size()>1){
                if(!(request.at(0).compare("requestip"))&&started==1){
                    QString requstIp=request.at(1);
                    qDebug()<<"ip: "<<requstIp;
                    QString  myIp=getHostIp();
                    QString myName=getHostName();
                    qDebug()<<myIp;
                    QTcpSocket*  answerSocket=new  QTcpSocket();
                    answerSocket->connectToHost(requstIp,1234);
                    answerSocket->write(myName.append(",").append(myIp).toUtf8());
                    answerSocket->close();
                }

            }
       }
}

QString  MainWindow::getHostIp(){
    QString str="";
    QList<QHostAddress>  netList  =  QNetworkInterface::allAddresses();
    for(int  i=0;i<netList.count();i++){
        QHostAddress ip=netList.at(i);
        if(ip.protocol()==QAbstractSocket::IPv4Protocol){
            str.append("|").append(netList.at(i).toString());
        }
    }
    return str;
}

QString  MainWindow::getHostName(){
    QString  name= QHostInfo::localHostName();
    return name;
}