2进制按键处理

#define GK_NULL              0
#define GK_W                   (1<<0)
#define GK_S              (1<<1)
#define GK_A              (1<<2)
#define GK_D              (1<<3)
#define GK_J               (1<<4)
#define GK_K              (1<<5)

int g_iKeyState = GK_NULL;

void(*pListeners[10])(char keycode);

short VK2GK(char keyCode)
{
    switch (keyCode)
    {
    case 'W':
    case 'w':
        return GK_W;
    case 'D':
    case 'd':
        return GK_D;
    case 'A':
    case 'a':
        return GK_A;
    case 'S':
    case 's':
        return GK_S;
    case 'J':
    case 'j':
        return GK_J;
    case 'K':
    case 'k':
        return GK_K;
    default:
        return GK_NULL;
    }
}

bool IsKeyDown(int gk)
{
    return g_iKeyState & gk;
}

void OnKeyDown(char keycode)
{
    cout << keycode << "按下" << endl;
    g_iKeyState |= VK2GK(keycode);
}

void OnKeyUp(char keycode)
{
    cout << keycode << "抬起" << endl;
    g_iKeyState &= ~VK2GK(keycode);
}

int RegistKeyFun(void(*pListeners[10])(char keycode),void(*pF)(char keycode))
{
    static int iD = 0;
    pListeners[iD++] = pF;
    return iD - 1;
}

void NotifyKey(void(*pListeners[10])(char keycode), int funID, int keycode)
{
    pListeners[funID](keycode);
}

void main()
{
    int keyDown = RegistKeyFun(pListeners, OnKeyDown);
    int keyUp = RegistKeyFun(pListeners, OnKeyUp);
    NotifyKey(pListeners, keyDown, 'a');
    NotifyKey(pListeners, keyDown, 'J');
    if (IsKeyDown(GK_A) && IsKeyDown(GK_J))
    {
        cout << "a和j被同时按下" << endl;
    }
    NotifyKey(pListeners, keyUp, 'A');
    if (!IsKeyDown(GK_A))
    {
        cout << "a抬起" << endl;
    }
}