Direct Input Class = Linker Errors

I''m creating a class for my direct input code, and when I try to write the initialization member function, it gives me about 7 linker errors when I compile, any ideas? //cDInput.h

class cDInput
{private:
	LPDIRECTINPUT		lpDI;
	LPDIRECTINPUTDEVICE	DeviceKeyboard;
	LPDIRECTINPUTDEVICE	DeviceMouse;
	DIMOUSESTATE		Mouse_State;
	char			Keys[256];
 public:
	cDInput();
	~cDInput();
	bool	fCreate(HWND hWndMain,HINSTANCE hInstance);
	bool	fError(int ErrNo,HWND hWnd);
}

//cDInput.cpp

bool cDInput::fCreate(HWND hWndMain,HINSTANCE hInstance)
{	if(!USE_INPUT)return true;
	if(DirectInputCreate(hInstance, DIRECTINPUT_VERSION, &lpDI, NULL)!=DI_OK)return fError(0x0001,hWndMain);
	
	//Keyboard Init
	if(lpDI->CreateDevice(GUID_SysKeyboard, &DeviceKeyboard, NULL)!=DI_OK)return fError(0x0002,hWndMain);
	if(DeviceKeyboard->SetDataFormat(&c_dfDIKeyboard)!=DI_OK)return fError(0x0003,hWndMain);
	if(DeviceKeyboard->SetCooperativeLevel(hWndMain, DISCL_FOREGROUND | DISCL_NONEXCLUSIVE)!=DI_OK)return fError(0x0004,hWndMain);
	if(DeviceKeyboard->Acquire()!=DI_OK)return fError(0x0005,hWndMain);
	
	//Mouse Init
	if(lpDI->CreateDevice(GUID_SysMouse, &DeviceMouse, NULL)!=DI_OK)return fError(0x0006,hWndMain);
	if(DeviceMouse->SetDataFormat(&c_dfDIMouse)!=DI_OK)return fError(0x0007,hWndMain);
	if(DeviceMouse->SetCooperativeLevel(hWndMain, DISCL_FOREGROUND | DISCL_EXCLUSIVE)!=DI_OK)return fError(0x0008,hWndMain);
	HANDLE HevtMouse = CreateEvent(0, 0, 0, 0);
	if(DeviceMouse->SetEventNotification(HevtMouse)!=DI_OK)return fError(0x0009,hWndMain);
	DIPROPDWORD dipdw = { { sizeof(DIPROPDWORD), sizeof(DIPROPHEADER), 0, DIPH_DEVICE,}, 32};
	if(DeviceMouse->SetProperty(DIPROP_BUFFERSIZE, &dipdw.diph)!=DI_OK)return fError(0x000A,hWndMain);
	if(DeviceMouse->Acquire()!=DI_OK)return fError(0x000B,hWndMain);
	return true;
}

//These are the errors it returns:

Linking...
cDInput.obj : error LNK2001: unresolved external symbol _GUID_SysMouse
cDInput.obj : error LNK2001: unresolved external symbol _GUID_SysKeyboard
dinput.lib(dilib1.obj) : error LNK2001: unresolved external symbol _GUID_ZAxis
dinput.lib(dilib1.obj) : error LNK2001: unresolved external symbol _GUID_YAxis
dinput.lib(dilib1.obj) : error LNK2001: unresolved external symbol _GUID_XAxis
dinput.lib(dilib2.obj) : error LNK2001: unresolved external symbol _GUID_Key
Debug/Shell.exe : fatal error LNK1120: 6 unresolved externals
Error executing link.exe.