[DllImport("user32.dll")]
public static extern int GetRawInputData(IntPtr hRawInput, RawInputCommand uiCommand, ref RAWINPUT pData, ref int pcbSize, int cbSizeHeader);

	/// <summary>
	/// Value type for raw input devices.
	/// </summary>
	[StructLayout(LayoutKind.Sequential)]
	public struct RAWINPUTDEVICE
	{
		/// <summary>Top level collection Usage page for the raw input device.</summary>
		public short UsagePage;
		/// <summary>Top level collection Usage for the raw input device. </summary>
		public short Usage;
		/// <summary>Mode flag that specifies how to interpret the information provided by UsagePage and Usage.</summary>
		public RawInputDeviceFlags Flags;
		/// <summary>Handle to the target device. If NULL, it follows the keyboard focus.</summary>
		public IntPtr WindowHandle;
	}

	/// <summary>
	/// Value type for a raw input header.
	/// </summary>
	[StructLayout(LayoutKind.Sequential)]
	public struct RAWINPUTHEADER
	{
		/// <summary>Type of device the input is coming from.</summary>
		public RawInputType Type;
		/// <summary>Size of the packet of data.</summary>
		public int Size;
		/// <summary>Handle to the device sending the data.</summary>
		public IntPtr Device;
		/// <summary>wParam from the window message.</summary>
		public IntPtr wParam;
	}

	/// <summary>
	/// Value type for raw input from a mouse.
	/// </summary>
	[StructLayout(LayoutKind.Sequential)]
	public struct RAWINPUTMOUSE
	{
		/// <summary>Flags for the event.</summary>
		public RawMouseFlags Flags;
		/// <summary>Flags for the event.</summary>
		public RawMouseButtons Buttons;
		/// <summary>If the mouse wheel is moved, this will contain the delta amount.</summary>
		public short ButtonData;
		/// <summary>Raw button data.</summary>
		public int RawButtons;
		/// <summary>Relative direction of motion, depending on flags.</summary>
		public int LastX;
		/// <summary>Relative direction of motion, depending on flags.</summary>
		public int LastY;
		/// <summary>Extra information.</summary>
		public int ExtraInformation;
	}

	/// <summary>
	/// Value type for raw input from a keyboard.
	/// </summary>	
	[StructLayout(LayoutKind.Sequential)]
	public struct RAWINPUTKEYBOARD
	{
		/// <summary>Scan code for key depression.</summary>
		public short MakeCode;
		/// <summary>Scan code information.</summary>
		public RawKeyboardFlags Flags;
		/// <summary>Reserved.</summary>
		public short Reserved;
		/// <summary>Virtual key code.</summary>
		public VirtualKeys VirtualKey;
		/// <summary>Corresponding window message.</summary>
		public WindowMessages Message;
		/// <summary>Extra information.</summary>
		public int ExtraInformation;
	}

	/// <summary>
	/// Value type for raw input from a HID.
	/// </summary>	
	[StructLayout(LayoutKind.Sequential)]
	public struct RAWINPUTHID
	{
		/// <summary>Size of the HID data in bytes.</summary>
		public int Size;
		/// <summary>Number of HID in Data.</summary>
		public int Count;
		/// <summary>Data for the HID.</summary>
		public IntPtr Data;
	}

	/// <summary>
	/// Value type for raw input.
	/// </summary>
	[StructLayout(LayoutKind.Explicit, Pack=1)]
	public struct RAWINPUT
	{
		/// <summary>Header for the data.</summary>
		[FieldOffset(0)]
		public RAWINPUTHEADER Header;
		/// <summary>Mouse raw input data.</summary>
		[FieldOffset(16)]
		public RAWINPUTMOUSE Mouse;
		/// <summary>Keyboard raw input data.</summary>
		[FieldOffset(16)]
		public RAWINPUTKEYBOARD Keyboard;
		/// <summary>HID raw input data.</summary>
		[FieldOffset(16)]
		public RAWINPUTHID HID;
	}

protected override void WndProc(ref Message m){	if (m.WParam.ToInt32() == (int)WindowMessages.RawInput)	{		int size = Marshal.SizeOf(typeof(RAWINPUT));		int outSize = 0;		RAWINPUT input = new RAWINPUT();		outSize = Win32API.GetRawInputData(m.LParam, RawInputCommand.Input, ref input, ref size, System.Runtime.InteropServices.Marshal.SizeOf(typeof(RAWINPUTHEADER)));		if (outSize != -1)		{			if (input.Header.Type == RawInputType.Mouse)			{				p.X = input.Mouse.LastX;				p.Y = input.Mouse.LastY;				Invalidate();			}		}		m.Result = IntPtr.Zero;		return;	}	base.WndProc(ref m);}