Unity中使用GetRawInputData

在Unity中使用GetRawInputData函数需要通过P/Invoke调用Windows API。以下是一个示例代码：

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

public class RawInputExample : MonoBehaviour
{
    // 定义Windows API函数
    [DllImport("user32.dll")]
    private static extern int GetRawInputData(IntPtr hRawInput, uint uiCommand, IntPtr pData, ref uint pcbSize, uint cbSizeHeader);

    // 定义Windows API结构体
    [StructLayout(LayoutKind.Sequential)]
    private struct RAWINPUTDEVICE
    {
        public ushort usUsagePage;
        public ushort usUsage;
        public uint dwFlags;
        public IntPtr hwndTarget;
    }

    // 定义Windows API常量
    private const uint RIDEV_INPUTSINK = 0x00000100;
    private const int WM_INPUT = 0x00FF;

    // 定义Windows API结构体
    [StructLayout(LayoutKind.Sequential)]
    private struct RAWINPUTHEADER
    {
        public uint dwType;
        public uint dwSize;
        public IntPtr hDevice;
        public IntPtr wParam;
    }

    // 定义Windows API结构体
    [StructLayout(LayoutKind.Sequential)]
    private struct RAWINPUT
    {
        public RAWINPUTHEADER header;
        public IntPtr data;
    }

    void Start()
    {
        // 注册原始输入设备
        RAWINPUTDEVICE[] rid = new RAWINPUTDEVICE[1];
        rid[0].usUsagePage = 0x01; // HID_USAGE_PAGE_GENERIC
        rid[0].usUsage = 0x06; // HID_USAGE_GENERIC_KEYBOARD
        rid[0].dwFlags = RIDEV_INPUTSINK;
        rid[0].hwndTarget = IntPtr.Zero;

        if (!RegisterRawInputDevices(rid, 1, (uint)Marshal.SizeOf(rid[0])))
        {
            Debug.LogError("Failed to register raw input device!");
            return;
        }
    }

    void Update()
    {
        // 处理原始输入消息
        uint dataSize = 0;
        GetRawInputData(IntPtr.Zero, 0x10000003, IntPtr.Zero, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

        if (dataSize > 0)
        {
            IntPtr rawData = Marshal.AllocHGlobal((int)dataSize);
            GetRawInputData(IntPtr.Zero, 0x10000003, rawData, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

            RAWINPUT rawInput = (RAWINPUT)Marshal.PtrToStructure(rawData, typeof(RAWINPUT));

            // 在这里处理原始输入数据
            // ...

            Marshal.FreeHGlobal(rawData);
        }
    }

    // 注册原始输入设备
    [DllImport("user32.dll")]
    private static extern bool RegisterRawInputDevices(RAWINPUTDEVICE[] pRawInputDevices, uint uiNumDevices, uint cbSize);
}

上述代码将在Unity中注册原始输入设备，并在Update函数中处理原始输入数据。你可以在Update函数的注释部分添加自己的原始输入数据处理逻辑。请注意，这段代码仅适用于Windows平台。