解決package.path問(wèn)題

Unity版本：2019.3.4f1
SLua版本：1.7.0
.NET : 4.7.1

初始化

1. 解壓SLua源碼赋兵，把Assets的Plugins和Slua兩個(gè)文件夾拷貝到Unity工程的Assets下即可，然后執(zhí)行Slua->All->Make搔预，即可生成Slua導(dǎo)出的C#文件霹期。
   這里會(huì)提示checkParams錯(cuò)誤，原因是缺少了Vector4[]的checkParams函數(shù)拯田，又無(wú)法通過(guò)模板函數(shù)轉(zhuǎn)換历造，所以只需要在 LuaObject_overload.cs 里拷貝以下Vector2[]的checkParams代碼，改成了Vector4[]就好了勿锅。

package.path問(wèn)題

1.SLua默認(rèn)是從Resources加載lua文件的帕膜，而且lua文件后綴必須是txt，這樣約束太大溢十。作者的回答
2.作者提供了LoaderDelegate垮刹，以方便定制lua加載策略。

方案：

1.指定初始化的package.path张弛，指向main.lua目錄即可荒典。
2.定義一個(gè)FileUtils工具類酪劫，主要負(fù)責(zé)：1.處理文件的讀取 2.判斷文件是否存在
3.定義一個(gè)LoaderDelegate，賦值給LuaSvr.mainState.loaderDelegate

步驟1

在LuaState.cs init()中添加寺董，至于getSearchPath就因工程目錄設(shè)計(jì)而異了覆糟，反正指向main.lua就好了

LuaDLL.lua_getglobal(L, "package");
LuaDLL.lua_pushstring(L, getSearchPath());
LuaDLL.lua_setfield(L, -2, "path");
LuaDLL.lua_pop(L, 1);

步驟2

FilUtils：（主要處理Win、安卓和iOS遮咖，安卓是利用AndroidJNI（未在真機(jī)驗(yàn)證）
參考： unity3d 在安卓平臺(tái)通過(guò)Native接口直接讀取apk中assets目錄下的文件
]

using UnityEngine;
using System.IO;
using System;
using SLua;

public class FileUtils
{
    private static FileUtils Instance;

#if UNITY_ANDROID
    AndroidJavaObject assetManager
#endif

    private FileUtils()
    {
#if UNITY_ANDROID
        var activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
        //從Activity取得AssetManager實(shí)例
        assetManager = activity.Call<AndroidJavaObject>("getAssets");
#endif
    }

    public static FileUtils GetInstance()
    {
        if (Instance == null)
        {
            Instance = new FileUtils();
        }
        return Instance;
    }

    public bool isFileExist(string filePath)
    {
#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_IPHONE
        return File.Exists(filePath);
#elif UNITY_ANDROID
        var stream = assetManager.Call<AndroidJavaObject>("open", filePath);
        if(stream)
        {
            stream.Call("close");
            stream.Dispose();
            return true;
        }
        return false;
#endif
    }

    public bool getContents(string filePath, out byte[] bytes, out int len)
    {
#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_IPHONE
        FileStream stream = new FileStream(filePath, FileMode.Open);
        bool ret = false;
        bytes = null;
        len = 0;
        if (null != stream)
        {
            len = (int)stream.Length;
            bytes = new byte[len];
            int readLend = stream.Read(bytes, 0, len);
            stream.Flush();
            stream.Close();
            ret = readLend == len;
        }
        return ret;

#elif UNITY_ANDROID
        //打開(kāi)文件流
        var stream = assetManager.Call<AndroidJavaObject>("open", filePath);
        if(stream == null)
            return fasle;
        //獲取文件長(zhǎng)度
        var availableBytes = stream.Call<int>("available");

        //取得InputStream.read的MethodID
        var clsPtr = AndroidJNI.FindClass("java.io.InputStream");
        var METHOD_read = AndroidJNIHelper.GetMethodID(clsPtr, "read", "([B)I");

        //申請(qǐng)一個(gè)Java ByteArray對(duì)象句柄
        var byteArray = AndroidJNI.NewByteArray(availableBytes);
        //調(diào)用方法
        int readCount = AndroidJNI.CallIntMethod(stream.GetRawObject(), METHOD_read, new[] { new jvalue() { l = byteArray } });
        //從Java ByteArray中得到C# byte數(shù)組
        var bytes = AndroidJNI.FromByteArray(byteArray);
        //刪除Java ByteArray對(duì)象句柄
        AndroidJNI.DeleteLocalRef(byteArray);
        //關(guān)閉文件流
        stream.Call("close");
        stream.Dispose();
        //返回結(jié)果
        return bytes;
#endif
    }

    public bool getLuaFileFullPath(IntPtr L, string fileName, out string fullPath)
    {
        LuaDLL.lua_getglobal(L, "package");
        LuaDLL.lua_getfield(L, -1, "path");
        string searchpath = LuaDLL.lua_tostring(L, -1);
        LuaDLL.lua_pop(L, 2);

        int begin = 0;
        int next = 0;

        bool found = false;
        fullPath = string.Empty;

        do
        {
            next = searchpath.IndexOf(";", begin);

            if (next == -1)
                next = searchpath.Length;

            string prefix = searchpath.Substring(begin, next - begin);

            if (!string.IsNullOrEmpty(prefix))
            {
                fullPath = prefix.Replace("?", fileName);

                if (isFileExist(fullPath))
                {
                    found = true;
                    break;
                }
            }

            begin = next + 1;
        } while (begin < searchpath.Length);

        return found;
    }
}

步驟3

在初始化腳本里滩字，設(shè)置一下Loader

public class Init : MonoBehaviour
{
    LuaSvr l;
    // Use this for initialization
    void Start()
    {
        l = new LuaSvr();
        setLoader(LuaSvr.mainState);
        l.init(null, () =>
        {
            l.start("main");
        });
    }

    void setLoader(LuaState state)
    {
        state.loaderDelegate = (string fn, ref string absoluteFn) =>
        {
            string strFullPath;
            bool found = FileUtils.GetInstance().getLuaFileFullPath(state.L, fn, out strFullPath);
            if(found)
            {
                byte[] bytes = null;
                int len = 0;
                if (FileUtils.GetInstance().getContents(strFullPath, out bytes, out len))
                    return bytes;
            }
            return null;
        };
    }
}

總結(jié)：

至此，就可以往packaget.path里添加多個(gè)搜索路徑御吞，而不受Resource約束麦箍。