unity文件写入与读取

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.SceneManagement;
using System;
using System.IO;
using System.Runtime.InteropServices;

public class GridEditor : EditorWindow
{
    public static string _gridPath = "Assets/Scence/Data/Grid/";
    public static float _perGridSize = 0.5f;
    public static float _gridX = 256;
    public static float _gridZ = 256;
    public static float _bottomHeight = -327;
    public static float _hafRayLength = 500;

    [MenuItem("Tools/GenerateGrid")]
    private static void GenerateGrid()
    {
        Scene scene = SceneManager.GetActiveScene();
        if (!scene.IsValid())
        {
            EditorUtility.DisplayDialog("1", "2", "OK");
            return;
        }

        string heightPath = _gridPath + scene.name + ".bytes";
        if (File.Exists(heightPath)) File.Delete(heightPath);

        FileStream fs_h = new FileStream(heightPath, FileMode.CreateNew);
        BinaryWriter bw_h = new BinaryWriter(fs_h);

        float haf = _perGridSize * 0.5f;
        float height = _bottomHeight * 100f;
        Vector3 rayDir = Vector3.down;
        Vector3 rayOrig = Vector3.zero;
        int maskLayerHeight = LayerMask.GetMask("Ground");
        RaycastHit rayHit;
        bool isHit = false;
        for (float z = haf; z < _gridX + haf; z += _perGridSize)
        {
            for (float x = haf; x < _gridZ + haf; x += _perGridSize)
            {
                rayOrig.Set(x, _hafRayLength, z);
                height = _bottomHeight * 100f;
                isHit = Physics.Raycast(rayOrig, rayDir, out rayHit, _hafRayLength * 2, maskLayerHeight);
                if (isHit)
                {
                    height = (float)Math.Round(rayHit.point.y, 2) * 100f;
                    height = Mathf.Max(height, _bottomHeight * 100f);
                    height = Mathf.Min(height, -_bottomHeight * 100f);
                }
                bw_h.Write((short)height);
            }
        }
        bw_h.Flush();
        bw_h.Close();
        fs_h.Close();
    }

    private static short[] heightData;
    [MenuItem("Tools/ReadGrid")]
    private static void ReadGrid()
    {
        TextAsset heightAsset = (TextAsset)GetByteAsset("GridTest");
        if (heightAsset)
        {
            heightData = new short[(int)(_gridX / _perGridSize) * (int)(_gridZ / _perGridSize)];
            System.IntPtr heightPtr = Marshal.UnsafeAddrOfPinnedArrayElement(heightAsset.bytes, 0);
            Marshal.Copy(heightPtr, heightData, 0, heightData.Length);
        }
        else
        {
            Debug.Log("read height Asset error");
            return;
        }

        for (int j = 0; j < heightData.Length; j++)
        {
            //Debug.Log(heightData[j] * 0.01f);
        }
    }

    private static UnityEngine.Object GetByteAsset(string resName, string ext = ".bytes")
    {
        string resPath = string.Format("{0}{1}" + ext, _gridPath, resName);
        UnityEngine.Object obj = AssetDatabase.LoadAssetAtPath(resPath, typeof(UnityEngine.Object));
        return obj;
    }
}