Qt Symbian: 禁止横竖屏自动切换

int main(int argc, char *argv[])
{       
   ......  

   
#ifdef Q_OS_SYMBIAN
    // lock orientation
    CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
    if(appUi){
        QT_TRAP_THROWING(appUi ->SetOrientationL(CAknAppUi::EAppUiOrientationPortrait));
    }
#endif

    ......

}