[Irrlicht] Probleme avec event.KeyInput.Key

Bonjour,
j'ai du mal a faire compiler ce code, il est senser deplacer un personnage en avant, arriere etc..
Est ce que quelqu'un peut m'aider?

voici les erreurs:
events_game.cc:26: erreur: «keyState" was not declared in this scope
events_game.cc:64: erreur: «keyState" was not declared in this scope

voici le code:

Code:

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#include <iostream>
#include <assert.h>
#include <irrlicht.h>
 
namespace graphic
{
bool
  EventsGame::OnEvent (SEvent event)
  {// if key is Pressed Down
 
    enum keyStatesENUM {UP, DOWN, PRESSED, RELEASED};
    if (event.KeyInput.PressedDown == true)
      {// If key was not down before
	if (keyState[event.KeyInput.Key] != DOWN)
	  {
	    keyState[event.KeyInput.Key] = PRESSED; // Set to Pressed
	    switch(event.KeyInput.Key)
	      {
	      case KEY_KEY_S:
		{
		  front_ = false;
		  back_ = true;
		}
		return true;
	      case KEY_KEY_W:
		{
		  back_ = false;
		  front_ = true;
		}
		return true;
	      case KEY_KEY_A:
		{
		  right_ = false;
		  left_ = true;
		}
		return true;
	      case KEY_KEY_D:
		{
		  left_ = false;
		  right_ = true;
		}
		return true;
	      }
	  }
      }
    else
      {// if the key is down
	if (keyState[event.KeyInput.Key] != UP)
	  {
	    keyState[event.KeyInput.Key] = RELEASED; // Set to Released
	    front_ = false;
	    back_ = true;
	    right_ = false;
	    left_ = true;
	    return true;
	  }
      }
  return false;
  }
}