Qt c++ 5.5 screen not save (windows)

[BuranereLoo]

Hi i have a problem in windows qt c++

void Ekrancek()
{
    QString time = QTime::currentTime().toString(Qt::DateFormat());
    QScreen *ekran = QGuiApplication::primaryScreen();
    if(ekran)
    {
 
        QPixmap selam = ekran->grabWindow(0);
 
#ifdef Q_OS_LINUX
        selam.save("/root/'"+time+"'.png");
#endif
 
#ifdef Q_OS_WIN32
 
        selam.save("'"+time+"'.png");
 
#endif
    }
}

void Ekrancek()
{
    QString time = QTime::currentTime().toString(Qt::DateFormat());
    QScreen *ekran = QGuiApplication::primaryScreen();
    if(ekran)
    {

        QPixmap selam = ekran->grabWindow(0);
        
#ifdef Q_OS_LINUX
        selam.save("/root/'"+time+"'.png");
#endif

#ifdef Q_OS_WIN32

        selam.save("'"+time+"'.png");

#endif
    }
}

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this block working in linux but not working in windows