Unity WM_INPUT

在Unity中，可以通过重写派生自UnityEngine.Windows.WindowsWindow类的自定义窗口脚本的WndProc方法来处理Windows消息。通过重写WndProc方法，您可以获取和处理各种Windows消息，包括WM_INPUT消息。

下面是一个示例代码，展示了如何在Unity中处理WM_INPUT消息：

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

public class RawInputExample : MonoBehaviour
{
    const int WM_INPUT = 0x00FF;

    protected override void WndProc(ref Message message)
    {
        if (message.Msg == WM_INPUT)
        {
            IntPtr hRawInput = message.LParam;
            uint dataSize = 0;

            // 获取原始输入数据的大小
            GetRawInputData(hRawInput, RID_INPUT, IntPtr.Zero, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

            if (dataSize > 0)
            {
                IntPtr data = Marshal.AllocHGlobal((int)dataSize);

                // 获取原始输入数据
                if (GetRawInputData(hRawInput, RID_INPUT, data, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER))) == dataSize)
                {
                    RAWINPUT rawInput = Marshal.PtrToStructure<RAWINPUT>(data);

                    // 在这里处理原始输入数据
                    
                    // 示例：检查输入设备类型是否为鼠标
                    if (rawInput.header.dwType == RIM_TYPEMOUSE)
                    {
                        RAWMOUSE mouseData = rawInput.mouse;

                        // 在这里处理鼠标输入数据
                        int deltaX = mouseData.lLastX;
                        int deltaY = mouseData.lLastY;

                        Debug.Log("Mouse Delta: " + deltaX + ", " + deltaY);
                    }
                }

                Marshal.FreeHGlobal(data);
            }

            base.WndProc(ref message);
            return;
        }

        base.WndProc(ref message);
    }

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

    [StructLayout(LayoutKind.Explicit)]
    struct RAWINPUT
    {
        [FieldOffset(0)]
        public RAWINPUTHEADER header;
        [FieldOffset(16)]
        public RAWMOUSE mouse;
        // 其他输入设备类型的数据结构
    }

    [StructLayout(LayoutKind.Sequential)]
    struct RAWMOUSE
    {
        public ushort usFlags;
        public uint ulButtons;
        public uint ulRawButtons;
        public int lLastX;
        public int lLastY;
        public uint ulExtraInformation;
    }

    const uint RIDEV_INPUTSINK = 0x00000100;
    const int RIM_TYPEMOUSE = 0x00000000;
    const int RID_INPUT = 0x10000003;

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

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

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

    void Start()
    {
        RAWINPUTDEVICE[] rawInputDevices = new RAWINPUTDEVICE[1];
        rawInputDevices[0].usUsagePage = 0x01; // HID_USAGE_PAGE_GENERIC
        rawInputDevices[0].usUsage = 0x02; // HID_USAGE_GENERIC_MOUSE
        rawInputDevices[0].dwFlags = RIDEV_INPUTSINK;
        rawInputDevices[0].hwndTarget = this.Handle;

        if (!RegisterRawInputDevices(rawInputDevices, (uint)rawInputDevices.Length, (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICE))))
        {
            Debug.LogError("Failed to register raw input devices");
        }
    }
}

上述示例代码中，重写了WndProc方法来处理Windows消息。在WndProc方法中，检查消息是否为WM_INPUT消息，并获取原始输入数据进行处理。示例代码中处理了鼠标输入数据，您可以根据实际需求进行相应的处理。

请注意，由于涉及到Windows API的调用，需要将上述代码放置在派生自UnityEngine.Windows.WindowsWindow类的自定义窗口脚本中，并确保脚本被正确添加到场景中。此外，还需要在Unity项目的Player Settings中启用"Allow 'unsafe' Code"选项。

希望这可以帮助您处理WM_INPUT消息并获取原始输入数据。如果有任何进一步的问题，请随时提问。