Unity RegisterRawInputDevices

在Unity中，无法直接使用`RegisterRawInputDevices`函数来注册原始输入设备。但是，你可以通过使用Windows API和Unity的插件来实现。

以下是一个示例代码，展示如何在Unity中注册原始输入设备：

using UnityEngine;
using System;
using System.Runtime.InteropServices;

public class RawInputRegistration : MonoBehaviour
{
    [DllImport("user32.dll")]
    private static extern bool RegisterRawInputDevices(ref RAWINPUTDEVICE pRawInputDevices, uint uiNumDevices, uint cbSize);

    // Constants for input device types
    private const ushort RIM_TYPEMOUSE = 0x0000;
    private const ushort RIM_TYPEKEYBOARD = 0x0001;
    private const ushort RIM_TYPEHID = 0x0002;

    // Constants for raw input flags
    private const uint RIDEV_INPUTSINK = 0x00000100;
    private const uint RIDEV_NOLEGACY = 0x00000030;

    // Structure for raw input device
    [StructLayout(LayoutKind.Sequential)]
    private struct RAWINPUTDEVICE
    {
        public ushort usUsagePage;
        public ushort usUsage;
        public uint dwFlags;
        public IntPtr hwndTarget;
    }

    private void Start()
    {
        RegisterRawInputDevicesForMouse();
        RegisterRawInputDevicesForKeyboard();
    }

    private void RegisterRawInputDevicesForMouse()
    {
        RAWINPUTDEVICE mouseDevice = new RAWINPUTDEVICE();
        mouseDevice.usUsagePage = 0x01; // Generic desktop controls
        mouseDevice.usUsage = 0x02; // Mouse
        mouseDevice.dwFlags = RIDEV_INPUTSINK; // Receive input even when not in the foreground
        mouseDevice.hwndTarget = IntPtr.Zero; // Null hwndTarget to receive input from all windows

        if (!RegisterRawInputDevices(ref mouseDevice, 1, (uint)Marshal.SizeOf(mouseDevice)))
        {
            Debug.LogError("Failed to register raw input device for mouse.");
        }
    }

    private void RegisterRawInputDevicesForKeyboard()
    {
        RAWINPUTDEVICE keyboardDevice = new RAWINPUTDEVICE();
        keyboardDevice.usUsagePage = 0x01; // Generic desktop controls
        keyboardDevice.usUsage = 0x06; // Keyboard
        keyboardDevice.dwFlags = RIDEV_INPUTSINK | RIDEV_NOLEGACY; // Receive input even when not in the foreground, and disable legacy keyboard messages
        keyboardDevice.hwndTarget = IntPtr.Zero; // Null hwndTarget to receive input from all windows

        if (!RegisterRawInputDevices(ref keyboardDevice, 1, (uint)Marshal.SizeOf(keyboardDevice)))
        {
            Debug.LogError("Failed to register raw input device for keyboard.");
        }
    }
}

这段代码在Unity中注册了鼠标和键盘的原始输入设备。请注意，这个示例只是一个起点，你可能需要根据你的具体需求进行相应的修改和扩展。

重要提示：使用Windows API函数需要在Unity项目中启用`unsafe`代码，并且在构建项目时选择为Windows平台。此外，这些代码只能在Windows平台上运行，无法在其他平台上使用。