i want to lock my program to portrait

[kzomran]

I used the following code to lock my program to work only as portrait

#ifdef TMGN_SYMBIAN_5
    CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
    if(appUi){
        QT_TRAP_THROWING(appUi ->SetOrientationL( CAknAppUi::EAppUiOrientationLandscape));
    }
    #endif

but i get an error that CEikonEnv is unknown i inluded #include <eikenv.h> and i again get that there is no such file name.

I wonder how to make this code work or if there is another way of locking the application to portrait given that my application is self signed."i cann't access extra capabilities"

[danhicksbyron]

#ifdef Q_OS_SYMBIAN
#include <AknAppUi.h>  // Need libs avkon cone eiksrv
#endif
...
...
#ifdef Q_OS_SYMBIAN
    // lock orientation
    CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
    if(appUi){
        QT_TRAP_THROWING(appUi ->SetOrientationL(CAknAppUi::EAppUiOrientationLandscape));
    }
#endif