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qDebug( "locallhost: %s", qPrintable( QHostInfo::localHostName() ) ); //-- localhost name
QList<QHostAddress> addressList = QNetworkInterface::allAddresses();
foreach( QHostAddress address, addressList )
    qDebug( "yet another address: %s", qPrintable( address.toString() ) );//-- eth & lo addresses

QList<QNetworkInterface> interfaces = QNetworkInterface::allInterfaces();
foreach( QNetworkInterface interface, interfaces )
    qDebug( "yet another interface: %s", qPrintable( interface.hardwareAddress() );//-- mac

for( int iCount = 0; iCount<QNetworkInterface::allInterfaces().count(); iCount++ )
{
    QNetworkInterface current = QNetworkInterface::interfaceFromIndex( iCount );
    if( current.isValid() )
    {
        QList<QNetworkAddressEntry> adresses = current.addressEntries();
        for( int addrId = 0; addrId < adresses.count() ; addrId++ )
            qDebug( "ip: %s", qPrintable( adresses.at( addrId ).ip().toString() ) );
    }
}

	static QString login;
	if(login.isEmpty())
	{
#ifdef Q_OS_WIN
		QT_WA({
			wchar_t buffer[256];
			DWORD bufferSize = sizeof(buffer) / sizeof(wchar_t) - 1;
			GetUserNameW(buffer, &bufferSize);
			login = QString::fromUtf16((ushort*)buffer);
		},
		{
			char buffer[256];
			DWORD bufferSize = sizeof(buffer) / sizeof(char) - 1;
			GetUserNameA(buffer, &bufferSize);
			login = QString::fromLocal8Bit(buffer);
		});
#else
		struct passwd* pwd = getpwuid(getuid());
		if(pwd)
			login = QString(pwd->pw_name);
#endif
	}