C++ SDL2操纵杆事件未触发

所以我得到了这个代码：

void Engine::Run() {
    // initialize all components
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK))
        throw Exception("couldn't initialize SDL\n" + string(SDL_GetError()), 1);

    // other code

    run = true;
    SDL_Event event;

    while (run) {
        // other code

        uint32 timeout = SDL_GetTicks() + 50;
        while (SDL_PollEvent(&event) && timeout - SDL_GetTicks() > 0)
            HandleEvent(event);
    }
}

void Engine::HandleEvent(const SDL_Event& event) {
    switch (event.type) {
    case SDL_KEYDOWN:
        inputSys->KeyDownEvent(event.key);
        break;
    case SDL_KEYUP:
        inputSys->KeyUpEvent(event.key);
        break;
    case SDL_JOYBUTTONDOWN:
        cout << "button" << endl;
        break;
    case SDL_JOYHATMOTION:
        cout << "hat" << endl;
        break;
    case SDL_JOYAXISMOTION:
        cout << "axis" << endl;
        break;
    case SDL_JOYDEVICEADDED: case SDL_JOYDEVICEREMOVED:
        inputSys->UpdateControllers();
        break;
    // other code
    }
}

void引擎：：Run（）{
//初始化所有组件
if（SDL_Init（SDL_Init_视频| SDL_Init_操纵杆））
抛出异常（“无法初始化SDL\n”+字符串（SDL\u GetError（）），1）；
//其他代码
run=true；
SDL_事件；
while（运行）{
//其他代码
uint32 timeout=SDL_GetTicks（）+50；
while（SDL_polleevent（&event）&&timeout-SDL_GetTicks（）>0）
HandleEvent（事件）；
}
}
无效引擎：：HandleEvent（常量SDL_事件和事件）{
开关（事件类型）{
案例SDL_按键关闭：
inputSys->KeyDownEvent（event.key）；
打破
案例SDL_密钥更新：
inputSys->KeyUpEvent（event.key）；
打破
案例SDL_JOYBUTTONDOWN：
cout你必须打电话获取这些事件。下面是它们的示例：

SDL_Joystick *joy;

// Initialize the joystick subsystem
SDL_InitSubSystem(SDL_INIT_JOYSTICK);

// Check for joystick
if (SDL_NumJoysticks() > 0) {
    // Open joystick
    joy = SDL_JoystickOpen(0);

    if (joy) {
        printf("Opened Joystick 0\n");
        printf("Name: %s\n", SDL_JoystickNameForIndex(0));
        printf("Number of Axes: %d\n", SDL_JoystickNumAxes(joy));
        printf("Number of Buttons: %d\n", SDL_JoystickNumButtons(joy));
        printf("Number of Balls: %d\n", SDL_JoystickNumBalls(joy));
    } else {
        printf("Couldn't open Joystick 0\n");
    }

    // Close if opened
    if (SDL_JoystickGetAttached(joy)) {
        SDL_JoystickClose(joy);
    }
}

你必须打电话获取这些事件。以下是它们的示例：

SDL_Joystick *joy;

// Initialize the joystick subsystem
SDL_InitSubSystem(SDL_INIT_JOYSTICK);

// Check for joystick
if (SDL_NumJoysticks() > 0) {
    // Open joystick
    joy = SDL_JoystickOpen(0);

    if (joy) {
        printf("Opened Joystick 0\n");
        printf("Name: %s\n", SDL_JoystickNameForIndex(0));
        printf("Number of Axes: %d\n", SDL_JoystickNumAxes(joy));
        printf("Number of Buttons: %d\n", SDL_JoystickNumButtons(joy));
        printf("Number of Balls: %d\n", SDL_JoystickNumBalls(joy));
    } else {
        printf("Couldn't open Joystick 0\n");
    }

    // Close if opened
    if (SDL_JoystickGetAttached(joy)) {
        SDL_JoystickClose(joy);
    }
}