What to #include for code about windows,raw mouse data - windows

Question

I find the following post very useful to do a project of my own. Here's the newbie question then: what must I include for this to work?
Link:
How to accurately measure mouse movement in inches or centimetres for a mouse with a known DPI
Content:
The following code registers the RAWINPUTDEVICE so it can be used in WM_INPUT.
RAWINPUTDEVICE Rid[1];
Rid[0].usUsagePage = HID_USAGE_PAGE_GENERIC;
Rid[0].usUsage = HID_USAGE_GENERIC_MOUSE;
Rid[0].dwFlags = RIDEV_INPUTSINK;
Rid[0].hwndTarget = hWnd;
RegisterRawInputDevices(Rid, 1, sizeof(Rid[0]);
The following code acutally uses the Rid variable two determine how many pixels the mouse has moved since the last time WM_INPUT was initiated.
case WM_INPUT:
{
UINT dwSize = 40;
static BYTE lpb[40];
GetRawInputData((HRAWINPUT)lParam, RID_INPUT,
lpb, &dwSize, sizeof(RAWINPUTHEADER));
RAWINPUT* raw = (RAWINPUT*)lpb;
if (raw->header.dwType == RIM_TYPEMOUSE)
{
int xPosRelative = raw->data.mouse.lLastX; // Could be 1, or could be more than 1
int yPosRelative = raw->data.mouse.lLastY; // Could be 1, or could be more than 1!
}
break;
}

Answer 1

I just found it.
#include "hidusage.h"
here's some definitions it has
#define HID_USAGE_GENERIC_POINTER ((USAGE) 0x01)
#define HID_USAGE_GENERIC_MOUSE ((USAGE) 0x02)
#define HID_USAGE_GENERIC_JOYSTICK ((USAGE) 0x04)
#define HID_USAGE_GENERIC_GAMEPAD ((USAGE) 0x05)
#define HID_USAGE_GENERIC_KEYBOARD ((USAGE) 0x06)
#define HID_USAGE_GENERIC_KEYPAD ((USAGE) 0x07)
#define HID_USAGE_GENERIC_SYSTEM_CTL ((USAGE) 0x80)
typedef USHORT USAGE,*PUSAGE;

Answer 2

You need to include windows.h
...also the HID_USAGE_PAGE_GENERIC and HID_USAGE_GENERIC_MOUSE must be defined.
See MSDN..
#ifndef HID_USAGE_PAGE_GENERIC
#define HID_USAGE_PAGE_GENERIC ((USHORT) 0x01)
#endif
#ifndef HID_USAGE_GENERIC_MOUSE
#define HID_USAGE_GENERIC_MOUSE ((USHORT) 0x02)
#endif
http://msdn.microsoft.com/en-gb/library/windows/desktop/ee418864%28v=vs.85%29.aspx