header2.h

namespaceInterfaceDemo
{
public ref classMyMediaPlayer sealed : public IMediaPlayer
 {
public:
//IMediaPlayer
virtual event OnStateChanged^ StateChanged;
virtual property Platform::String^ CurrentTitle;
virtual property PlayState CurrentState;
virtualvoidPlay()
 {
// …
auto args = ref newMediaPlayerEventArgs(); 
 args->newState = PlayState::Playing;
 args->oldState = PlayState::Stopped;
StateChanged(this, args);
 }
virtualvoidPause(){/*...*/}
virtualvoidStop(){/*...*/}
virtualvoidForward(float speed){/*...*/}
virtualvoidBack(float speed){/*...*/}
private:
//...
 };
}