C++ LPDIRECTINPUT8::QueryInterface方法代码示例

    HRESULT InitDirectInput(unsigned int joystick_index)
    {
        HRESULT hr;

        state.is_initialized = false;

        // Register with the DirectInput subsystem and get a pointer
        // to a IDirectInput interface we can use.
        // Create a DInput object
        if (FAILED(hr = DirectInput8Create(GetModuleHandle(nullptr), DIRECTINPUT_VERSION,
            IID_IDirectInput8, (VOID**)&g_pDI, nullptr)))
            return hr;


        if (g_bFilterOutXinputDevices)
            SetupForIsXInputDevice();

        enumContext.pPreferredJoyCfg = &PreferredJoyCfg;
        enumContext.bPreferredJoyCfgValid = false;

        IDirectInputJoyConfig8* pJoyConfig = nullptr;
        if (FAILED(hr = g_pDI->QueryInterface(IID_IDirectInputJoyConfig8, (void**)&pJoyConfig))) {
            state.message = "QueryInterface on IID_IDirectInputJoyConfig8 failed";
            return hr;
        }

        PreferredJoyCfg.dwSize = sizeof(PreferredJoyCfg);
        if (SUCCEEDED(pJoyConfig->GetConfig(joystick_index, &PreferredJoyCfg, DIJC_GUIDINSTANCE))) { // This function is expected to fail if no joystick is attached
            enumContext.bPreferredJoyCfgValid = true;

            joystick_info.is_valid = true;
            joystick_info.instance_guide = toDIGUID(PreferredJoyCfg.guidInstance);
            joystick_info.pid_vid = toString(PreferredJoyCfg.wszType);
        }
        DIJT_SAFE_RELEASE(pJoyConfig);

        // Look for a simple joystick we can use for this sample program.
        if (FAILED(hr = g_pDI->EnumDevices(DI8DEVCLASS_GAMECTRL,
            DirectInputJoyStick::impl::EnumJoysticksCallback,
            this, DIEDFL_ATTACHEDONLY))) {

            state.message = "EnumDevices failed";
            return hr;
        }

        if (g_bFilterOutXinputDevices)
            CleanupForIsXInputDevice();

        // Make sure we got a joystick
        if (!g_pJoystick)
        {
            state.message = "Joystick at index " + std::to_string(joystick_index) + " is not available";
            return S_FALSE;
        }

        // Set the data format to "simple joystick" - a predefined data format 
        //
        // A data format specifies which controls on a device we are interested in,
        // and how they should be reported. This tells DInput that we will be
        // passing a DIJOYSTATE2 structure to IDirectInputDevice::GetDeviceState().
        if (FAILED(hr = g_pJoystick->SetDataFormat(&c_dfDIJoystick2)))
        {
            state.message = "Device does not support DIJOYSTATE2";
            return hr;
        }

        // Set the cooperative level to let DInput know how this device should
        // interact with the system and with other DInput applications.
        if (FAILED(hr = g_pJoystick->SetCooperativeLevel(NULL, DISCL_NONEXCLUSIVE | DISCL_BACKGROUND))) {

            state.message = "SetCooperativeLevel failed";
            return hr;
        }

        // Enumerate the joystick objects. The callback function enabled user
        // interface elements for objects that are found, and sets the min/max
        // values property for discovered axes.
        if (FAILED(hr = g_pJoystick->EnumObjects(DirectInputJoyStick::impl::EnumObjectsCallback,
            (VOID*) this, DIDFT_ALL))) {

            state.message = "EnumObjects failed";
            return hr;
        }

        InitForceFeedback();

        state.is_initialized = true;
        return S_OK;
    }

C_RESULT open_dx_gamepad(void)
{
  HRESULT hr;
  HWND hDlg = GetConsoleHwnd();

    // Register with the DirectInput subsystem and get a pointer
    // to a IDirectInput interface we can use.
    // Create a DInput object
  
	if (g_pDI==NULL)
    if( VP_FAILED( hr = DirectInput8Create( GetModuleHandle( NULL ), DIRECTINPUT_VERSION,
                                         IID_IDirectInput8, ( VOID** )&g_pDI, NULL ) ) )
        return hr;


    if( g_bFilterOutXinputDevices )
        SetupForIsXInputDevice();

    DIJOYCONFIG PreferredJoyCfg = {0};
    DI_ENUM_CONTEXT enumContext;
    enumContext.pPreferredJoyCfg = &PreferredJoyCfg;
    enumContext.bPreferredJoyCfgValid = false;

    IDirectInputJoyConfig8* pJoyConfig = NULL;
    if( VP_FAILED( hr = g_pDI->QueryInterface( IID_IDirectInputJoyConfig8, ( void** )&pJoyConfig ) ) )
        return hr;

    PreferredJoyCfg.dwSize = sizeof( PreferredJoyCfg );
    if( SUCCEEDED( pJoyConfig->GetConfig( 0, &PreferredJoyCfg, DIJC_GUIDINSTANCE ) ) ) // This function is expected to fail if no g_pJoystick is attached
        enumContext.bPreferredJoyCfgValid = true;
    SAFE_RELEASE( pJoyConfig );

    // Look for a simple g_pJoystick we can use for this sample program.
    if( VP_FAILED( hr = g_pDI->EnumDevices( DI8DEVCLASS_GAMECTRL,
                                         Enumg_pJoysticksCallback,
                                         &enumContext, DIEDFL_ATTACHEDONLY ) ) )
        return hr;

    if( g_bFilterOutXinputDevices )
        CleanupForIsXInputDevice();

    // Make sure we got a g_pJoystick
    if( g_pJoystick == NULL )
    {
        //MessageBox( NULL, TEXT( "Joystick not found." ),
         //           TEXT( "A.R. Drone"),
           //         MB_ICONERROR | MB_OK );
       // EndDialog( hDlg, 0 );
        return C_FAIL;
    }

    // Set the data format to "simple g_pJoystick" - a predefined data format 
    //
    // A data format specifies which controls on a device we are interested in,
    // and how they should be reported. This tells DInput that we will be
    // passing a DIJOYSTATE2 structure to IDirectInputDevice::GetDeviceState().
	if( VP_FAILED( hr = g_pJoystick->SetDataFormat( &c_dfDIJoystick2 ) ) )
        return C_FAIL;

    // Set the cooperative level to let DInput know how this device should
    // interact with the system and with other DInput applications.
	if( VP_FAILED( hr = g_pJoystick->SetCooperativeLevel( hDlg , DISCL_EXCLUSIVE |
                                                       DISCL_FOREGROUND ) ) )
        return C_FAIL;

    // Enumerate the g_pJoystick objects. The callback function enabled user
    // interface elements for objects that are found, and sets the min/max
    // values property for discovered axes.
    if( VP_FAILED( hr = g_pJoystick->EnumObjects( EnumObjectsCallback,
                                               ( VOID* )hDlg, DIDFT_ALL ) ) )
        return C_FAIL;

    return C_OK;
}

 /*** IUnknown methods ***/
 HRESULT _stdcall QueryInterface (REFIID riid, LPVOID * ppvObj)
 {
     return RealInput->QueryInterface(riid,ppvObj);
 }