Error After adding DirectInput Code

LPDIRECTINPUT8  pDXInput;LPDIRECTINPUTDEVICE8  pDXKeyboard; #define    KeyDown(data, n)    ((data[n] & 0x80) ? true : false)#define    KeyUp(data, n)    ((data[n] & 0x80) ? false : true)class KAIGANGRAPHICS_API K3DInput{public:	K3DInput(HWND wndHandle  = NULL);	~K3DInput();	int KeyboardState();private:	unsigned char keystate[256];}[/Source]

K3DInput::K3DInput(HWND wndHandle){	HRESULT hr;	hr = DirectInput8Create(GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (void**)&pDXInput, NULL);	if(FAILED(hr))		return; //Error	hr = pDXInput->CreateDevice(GUID_SysKeyboard, &pDXKeyboard, NULL);	if(FAILED(hr))		return; //Error	hr = pDXKeyboard->SetDataFormat(&c_dfDIKeyboard); 	if(FAILED(hr))		return; //Error	hr = pDXKeyboard->SetCooperativeLevel(wndHandle, DISCL_FOREGROUND | DISCL_NONEXCLUSIVE); 	if(FAILED(hr))		return; //Error	hr = pDXKeyboard->Acquire();	if(FAILED(hr))		return; //Error}K3DInput::~K3DInput(){		if (pDXKeyboard)		pDXKeyboard->Release();  	if (pDXInput)		 pDXInput->Release();}int K3DInput::KeyboardState(){		HRESULT hr;    	hr = pDXKeyboard->GetDeviceState(sizeof(unsigned char[256]), (LPVOID)keystate);	if(FAILED(hr))		return -1; //Error	int KeyPressed;	if(KeyDown(keystate, DIK_NUMPAD1))		KeyPressed = 1;	if(KeyDown(keystate, DIK_NUMPAD2))		KeyPressed = 2;	if(KeyDown(keystate, DIK_NUMPAD3))		KeyPressed = 3;	if(KeyDown(keystate, DIK_NUMPAD4))		KeyPressed = 4;	if(KeyDown(keystate, DIK_NUMPAD5))		KeyPressed = 5;	if(KeyDown(keystate, DIK_NUMPAD6))		KeyPressed = 6;	if(KeyDown(keystate, DIK_NUMPAD7))		KeyPressed = 7;	if(KeyDown(keystate, DIK_NUMPAD8))		KeyPressed = 8;	if(KeyDown(keystate, DIK_NUMPAD9))		KeyPressed = 9;	return KeyPressed;}