C# Definition:

/// <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 HIDUsagePage UsagePage;
    /// <summary>Top level collection Usage for the raw input device. </summary>
    public HIDUsage 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;
}

VB.NET Definition:

''' <summary>Value type for raw input devices.</summary>
<StructLayout(LayoutKind.Sequential)> _
Public Structure RAWINPUTDEVICE
    ''' <summary>Top level collection Usage page for the raw input device.</summary>
    Public UsagePage As HIDUsagePage
    ''' <summary>Top level collection Usage for the raw input device. </summary>
    Public Usage As HIDUsage
    ''' <summary>Mode flag that specifies how to interpret the information provided by UsagePage and Usage.</summary>
    Public Flags As RawInputDeviceFlags
    ''' <summary>Handle to the target device. If NULL, it follows the keyboard focus.</summary>
    Public WindowHandle As IntPtr
End Structure

User-Defined Field Types:

    /// <summary>
    /// Enumeration containing HID usage page flags.
    /// </summary>
    public enum HIDUsagePage
        : ushort
    {
        /// <summary>Unknown usage page.</summary>
        Undefined = 0x00,
        /// <summary>Generic desktop controls.</summary>
        Generic = 0x01,
        /// <summary>Simulation controls.</summary>
        Simulation = 0x02,
        /// <summary>Virtual reality controls.</summary>
        VR = 0x03,
        /// <summary>Sports controls.</summary>
        Sport = 0x04,
        /// <summary>Games controls.</summary>
        Game = 0x05,
        /// <summary>Keyboard controls.</summary>
        Keyboard = 0x07,
        /// <summary>LED controls.</summary>
        LED = 0x08,
        /// <summary>Button.</summary>
        Button = 0x09,
        /// <summary>Ordinal.</summary>
        Ordinal = 0x0A,
        /// <summary>Telephony.</summary>
        Telephony = 0x0B,
        /// <summary>Consumer.</summary>
        Consumer = 0x0C,
        /// <summary>Digitizer.</summary>
        Digitizer = 0x0D,
        /// <summary>Physical interface device.</summary>
        PID = 0x0F,
        /// <summary>Unicode.</summary>
        Unicode = 0x10,
        /// <summary>Alphanumeric display.</summary>
        AlphaNumeric = 0x14,
        /// <summary>Medical instruments.</summary>
        Medical = 0x40,
        /// <summary>Monitor page 0.</summary>
        MonitorPage0 = 0x80,
        /// <summary>Monitor page 1.</summary>
        MonitorPage1 = 0x81,
        /// <summary>Monitor page 2.</summary>
        MonitorPage2 = 0x82,
        /// <summary>Monitor page 3.</summary>
        MonitorPage3 = 0x83,
        /// <summary>Power page 0.</summary>
        PowerPage0 = 0x84,
        /// <summary>Power page 1.</summary>
        PowerPage1 = 0x85,
        /// <summary>Power page 2.</summary>
        PowerPage2 = 0x86,
        /// <summary>Power page 3.</summary>
        PowerPage3 = 0x87,
        /// <summary>Bar code scanner.</summary>
        BarCode = 0x8C,
        /// <summary>Scale page.</summary>
        Scale = 0x8D,
        /// <summary>Magnetic strip reading devices.</summary>
        MSR = 0x8E
    }

    /// <summary>
    /// Enumeration containing the HID usage values.
    /// </summary>
    public enum HIDUsage
        : ushort
    {
        /// <summary></summary>
        Pointer = 0x01,
        /// <summary></summary>
        Mouse = 0x02,
        /// <summary></summary>
        Joystick = 0x04,
        /// <summary></summary>
        Gamepad = 0x05,
        /// <summary></summary>
        Keyboard = 0x06,
        /// <summary></summary>
        Keypad = 0x07,
        /// <summary></summary>
        SystemControl = 0x80,
        /// <summary></summary>
        X = 0x30,
        /// <summary></summary>
        Y = 0x31,
        /// <summary></summary>
        Z = 0x32,
        /// <summary></summary>
        RelativeX = 0x33,
        /// <summary></summary>        
        RelativeY = 0x34,
        /// <summary></summary>
        RelativeZ = 0x35,
        /// <summary></summary>
        Slider = 0x36,
        /// <summary></summary>
        Dial = 0x37,
        /// <summary></summary>
        Wheel = 0x38,
        /// <summary></summary>
        HatSwitch = 0x39,
        /// <summary></summary>
        CountedBuffer = 0x3A,
        /// <summary></summary>
        ByteCount = 0x3B,
        /// <summary></summary>
        MotionWakeup = 0x3C,
        /// <summary></summary>
        VX = 0x40,
        /// <summary></summary>
        VY = 0x41,
        /// <summary></summary>
        VZ = 0x42,
        /// <summary></summary>
        VBRX = 0x43,
        /// <summary></summary>
        VBRY = 0x44,
        /// <summary></summary>
        VBRZ = 0x45,
        /// <summary></summary>
        VNO = 0x46,
        /// <summary></summary>
        SystemControlPower = 0x81,
        /// <summary></summary>
        SystemControlSleep = 0x82,
        /// <summary></summary>
        SystemControlWake = 0x83,
        /// <summary></summary>
        SystemControlContextMenu = 0x84,
        /// <summary></summary>
        SystemControlMainMenu = 0x85,
        /// <summary></summary>
        SystemControlApplicationMenu = 0x86,
        /// <summary></summary>
        SystemControlHelpMenu = 0x87,
        /// <summary></summary>
        SystemControlMenuExit = 0x88,
        /// <summary></summary>
        SystemControlMenuSelect = 0x89,
        /// <summary></summary>
        SystemControlMenuRight = 0x8A,
        /// <summary></summary>
        SystemControlMenuLeft = 0x8B,
        /// <summary></summary>
        SystemControlMenuUp = 0x8C,
        /// <summary></summary>
        SystemControlMenuDown = 0x8D,
        /// <summary></summary>
        KeyboardNoEvent = 0x00,
        /// <summary></summary>
        KeyboardRollover = 0x01,
        /// <summary></summary>
        KeyboardPostFail = 0x02,
        /// <summary></summary>
        KeyboardUndefined = 0x03,
        /// <summary></summary>
        KeyboardaA = 0x04,
        /// <summary></summary>
        KeyboardzZ = 0x1D,
        /// <summary></summary>
        Keyboard1 = 0x1E,
        /// <summary></summary>
        Keyboard0 = 0x27,
        /// <summary></summary>
        KeyboardLeftControl = 0xE0,
        /// <summary></summary>
        KeyboardLeftShift = 0xE1,
        /// <summary></summary>
        KeyboardLeftALT = 0xE2,
        /// <summary></summary>
        KeyboardLeftGUI = 0xE3,
        /// <summary></summary>
        KeyboardRightControl = 0xE4,
        /// <summary></summary>
        KeyboardRightShift = 0xE5,
        /// <summary></summary>
        KeyboardRightALT = 0xE6,
        /// <summary></summary>
        KeyboardRightGUI = 0xE7,
        /// <summary></summary>
        KeyboardScrollLock = 0x47,
        /// <summary></summary>
        KeyboardNumLock = 0x53,
        /// <summary></summary>
        KeyboardCapsLock = 0x39,
        /// <summary></summary>
        KeyboardF1 = 0x3A,
        /// <summary></summary>
        KeyboardF12 = 0x45,
        /// <summary></summary>
        KeyboardReturn = 0x28,
        /// <summary></summary>
        KeyboardEscape = 0x29,
        /// <summary></summary>
        KeyboardDelete = 0x2A,
        /// <summary></summary>
        KeyboardPrintScreen = 0x46,
        /// <summary></summary>
        LEDNumLock = 0x01,
        /// <summary></summary>
        LEDCapsLock = 0x02,
        /// <summary></summary>
        LEDScrollLock = 0x03,
        /// <summary></summary>
        LEDCompose = 0x04,
        /// <summary></summary>
        LEDKana = 0x05,
        /// <summary></summary>
        LEDPower = 0x06,
        /// <summary></summary>
        LEDShift = 0x07,
        /// <summary></summary>
        LEDDoNotDisturb = 0x08,
        /// <summary></summary>
        LEDMute = 0x09,
        /// <summary></summary>
        LEDToneEnable = 0x0A,
        /// <summary></summary>
        LEDHighCutFilter = 0x0B,
        /// <summary></summary>
        LEDLowCutFilter = 0x0C,
        /// <summary></summary>
        LEDEqualizerEnable = 0x0D,
        /// <summary></summary>
        LEDSoundFieldOn = 0x0E,
        /// <summary></summary>
        LEDSurroundFieldOn = 0x0F,
        /// <summary></summary>
        LEDRepeat = 0x10,
        /// <summary></summary>
        LEDStereo = 0x11,
        /// <summary></summary>
        LEDSamplingRateDirect = 0x12,
        /// <summary></summary>
        LEDSpinning = 0x13,
        /// <summary></summary>
        LEDCAV = 0x14,
        /// <summary></summary>
        LEDCLV = 0x15,
        /// <summary></summary>
        LEDRecordingFormatDet = 0x16,
        /// <summary></summary>
        LEDOffHook = 0x17,
        /// <summary></summary>
        LEDRing = 0x18,
        /// <summary></summary>
        LEDMessageWaiting = 0x19,
        /// <summary></summary>
        LEDDataMode = 0x1A,
        /// <summary></summary>
        LEDBatteryOperation = 0x1B,
        /// <summary></summary>
        LEDBatteryOK = 0x1C,
        /// <summary></summary>
        LEDBatteryLow = 0x1D,
        /// <summary></summary>
        LEDSpeaker = 0x1E,
        /// <summary></summary>
        LEDHeadset = 0x1F,
        /// <summary></summary>
        LEDHold = 0x20,
        /// <summary></summary>
        LEDMicrophone = 0x21,
        /// <summary></summary>
        LEDCoverage = 0x22,
        /// <summary></summary>
        LEDNightMode = 0x23,
        /// <summary></summary>
        LEDSendCalls = 0x24,
        /// <summary></summary>
        LEDCallPickup = 0x25,
        /// <summary></summary>
        LEDConference = 0x26,
        /// <summary></summary>
        LEDStandBy = 0x27,
        /// <summary></summary>
        LEDCameraOn = 0x28,
        /// <summary></summary>
        LEDCameraOff = 0x29,
        /// <summary></summary>        
        LEDOnLine = 0x2A,
        /// <summary></summary>
        LEDOffLine = 0x2B,
        /// <summary></summary>
        LEDBusy = 0x2C,
        /// <summary></summary>
        LEDReady = 0x2D,
        /// <summary></summary>
        LEDPaperOut = 0x2E,
        /// <summary></summary>
        LEDPaperJam = 0x2F,
        /// <summary></summary>
        LEDRemote = 0x30,
        /// <summary></summary>
        LEDForward = 0x31,
        /// <summary></summary>
        LEDReverse = 0x32,
        /// <summary></summary>
        LEDStop = 0x33,
        /// <summary></summary>
        LEDRewind = 0x34,
        /// <summary></summary>
        LEDFastForward = 0x35,
        /// <summary></summary>
        LEDPlay = 0x36,
        /// <summary></summary>
        LEDPause = 0x37,
        /// <summary></summary>
        LEDRecord = 0x38,
        /// <summary></summary>
        LEDError = 0x39,
        /// <summary></summary>
        LEDSelectedIndicator = 0x3A,
        /// <summary></summary>
        LEDInUseIndicator = 0x3B,
        /// <summary></summary>
        LEDMultiModeIndicator = 0x3C,
        /// <summary></summary>
        LEDIndicatorOn = 0x3D,
        /// <summary></summary>
        LEDIndicatorFlash = 0x3E,
        /// <summary></summary>
        LEDIndicatorSlowBlink = 0x3F,
        /// <summary></summary>
        LEDIndicatorFastBlink = 0x40,
        /// <summary></summary>
        LEDIndicatorOff = 0x41,
        /// <summary></summary>
        LEDFlashOnTime = 0x42,
        /// <summary></summary>
        LEDSlowBlinkOnTime = 0x43,
        /// <summary></summary>
        LEDSlowBlinkOffTime = 0x44,
        /// <summary></summary>
        LEDFastBlinkOnTime = 0x45,
        /// <summary></summary>
        LEDFastBlinkOffTime = 0x46,
        /// <summary></summary>
        LEDIndicatorColor = 0x47,
        /// <summary></summary>
        LEDRed = 0x48,
        /// <summary></summary>
        LEDGreen = 0x49,
        /// <summary></summary>
        LEDAmber = 0x4A,
        /// <summary></summary>
        LEDGenericIndicator = 0x3B,
        /// <summary></summary>
        TelephonyPhone = 0x01,
        /// <summary></summary>
        TelephonyAnsweringMachine = 0x02,
        /// <summary></summary>
        TelephonyMessageControls = 0x03,
        /// <summary></summary>
        TelephonyHandset = 0x04,
        /// <summary></summary>
        TelephonyHeadset = 0x05,
        /// <summary></summary>
        TelephonyKeypad = 0x06,
        /// <summary></summary>
        TelephonyProgrammableButton = 0x07,
        /// <summary></summary>
        SimulationRudder = 0xBA,
        /// <summary></summary>
        SimulationThrottle = 0xBB
    }

Notes:

None.

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