#include <QQmlContext>
    #include <QGuiApplication>
    #include <QQmlApplicationEngine>
    #include <usbdeviceid.h>
    #include <iostream>
    #include <QProcess>
    using namespace std;

    int main(int argc, char *argv[])
    {
        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
        QGuiApplication app(argc, argv);
        QQmlApplicationEngine engine;
        bool scanForDevices=0;
        USBdeviceID *usbdeviceid =new USBdeviceID();
        engine.rootContext()->setContextProperty("USBdeviceID", usbdeviceid);
        QProcess OProcess;
        QString Command;    //Contains the command to be execute
        Command = "lsusb";
     
        while (1)
        {
            OProcess.start(Command,QIODevice::ReadOnly); //Starts execution of command
            OProcess.waitForFinished();   //Waits for execution to complete

            QString StdOut      =   OProcess.readAllStandardOutput();  
            QString StdError    =   OProcess.readAllStandardError();  

            cout<<"\n Printing the standard output..........\n";
            cout<<endl<<StdOut.toStdString();
            bool mouse1 = StdOut.contains("ID 046d:c03e");                                                   
            bool keyBoard1 = StdOut.contains("ID 413c:1003"); 

            if (mouse1 ==1 && keyBoard1==1)
            {
                scanForDevices=1;
            }

            if (scanForDevices==1)
            {
                // start main program
                // revoke A signal to tell QML the correct devices are connected
                usbdeviceid->setMouse1Detected(1);
                usbdeviceid->setkeyBoard1Detected(1);
                engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
                if (engine.rootObjects().isEmpty())
                    return -1;
                return app.exec();
            }
        }
       }
      }