来自不同键盘的RawInput C# .Net

using System;
using System.Runtime.InteropServices;

public class RawInputExample
{
    [StructLayout(LayoutKind.Sequential)]
    public struct RAWINPUTDEVICE
    {
        public ushort usUsagePage;
        public ushort usUsage;
        public uint dwFlags;
        public IntPtr hwndTarget;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct RAWINPUTHEADER
    {
        public uint dwType;
        public uint dwSize;
        public IntPtr hDevice;
        public IntPtr wParam;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct RAWKEYBOARD
    {
        public ushort MakeCode;
        public ushort Flags;
        public ushort Reserved;
        public ushort VKey;
        public uint Message;
        public uint ExtraInformation;
    }

    [DllImport("user32.dll")]
    public static extern bool RegisterRawInputDevices(RAWINPUTDEVICE[] pRawInputDevices, uint uiNumDevices, uint cbSize);

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

    public static void Main()
    {
        RAWINPUTDEVICE[] devices = new RAWINPUTDEVICE[1];
        devices[0].usUsagePage = 0x01; // Generic desktop controls
        devices[0].usUsage = 0x06; // Keyboard
        devices[0].dwFlags = 0x00000100; // RIDEV_INPUTSINK
        devices[0].hwndTarget = IntPtr.Zero;

        if (!RegisterRawInputDevices(devices, (uint)devices.Length, (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICE))))
        {
            Console.WriteLine("Failed to register raw input devices.");
            return;
        }

        uint size = 0;
        GetRawInputData(IntPtr.Zero, 0x10000003, IntPtr.Zero, ref size, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

        IntPtr buffer = Marshal.AllocHGlobal((int)size);
        try
        {
            if (GetRawInputData(IntPtr.Zero, 0x10000003, buffer, ref size, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER))) != uint.MaxValue)
            {
                RAWINPUTHEADER header = Marshal.PtrToStructure<RAWINPUTHEADER>(buffer);
                if (header.dwType == 0x0100) // RIM_TYPEKEYBOARD
                {
                    RAWKEYBOARD keyboard = Marshal.PtrToStructure<RAWKEYBOARD>(buffer + (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));
                    Console.WriteLine("Key pressed: " + (Keys)keyboard.VKey);
                }
            }
        }
        finally
        {
            Marshal.FreeHGlobal(buffer);
        }
    }
}