目錄

打包與資源加載框架目錄

正文

熱更流程都不是固定的，每個人寫的狀態(tài)機也有所差別，但是一些必要步驟肯定不可能少，例如下載清單，對比版本，下載AB包，標記下載完成。我接下來的每一篇文章都是下載AB包的重要步驟，大概率是不能省略的。

檢查沙盒路徑是否存在

public static string MakePersistentLoadPath(string path)
{
#if UNITY_EDITOR
        // 注意：為了方便調(diào)試查看，編輯器下把存儲目錄放到項目里
        string projectPath = Path.GetDirectoryName(Application.dataPath).Replace("\\","/");
        projectPath = GetRegularPath(projectPath);
        return StringFormat.Format("{0}/Sandbox/{1}", projectPath, path);
#else
        return StringFormat.Format("{0}/Sandbox/{1}", Application.persistentDataPath, path);
#endif
}

檢查下載臨時目錄是否存在

請注意，熱更時下載AB包先下載到臨時目錄，之后再拷貝到沙盒目錄

public static string MakeDownloadTempPath(string path)
{
#if UNITY_EDITOR
    string projectPath = Path.GetDirectoryName(Application.dataPath).Replace("\\", "/");
    projectPath = GetRegularPath(projectPath);
    return StringFormat.Format("{0}/Sandbox_Temp/{1}", projectPath, path);
#else
    return StringFormat.Format("{0}/Sandbox_Temp/{1}", Application.persistentDataPath, path);
#endif
}

路徑都確認存在后，開始下載

---

前文有介紹過，生成的AB包清單長這個樣子，把這個文件生成二進制bytes文件扔到服務(wù)器上去下載。

第一行是SVN版本號

第二行是AB包數(shù)量

從第三行開始是資源包信息，以=號分割開有效數(shù)據(jù)，分別是

MD5.unity3d = 資源路徑 = 資源路徑的HashId = 包體KB大小 = SVN版本號 = 啟動熱更模式

每一行數(shù)據(jù)封裝了一個PatchElement類，代碼在下文中

我們項目封裝了一下UnityWebRequest，叫WebDataRequest，你不想封裝直接用UnityWebRequest即可，WebDataRequest代碼在后面有。

private IEnumerator DownLoad()
{
    // 解析APP里的補丁清單
    string filePath = AssetPathHelper.MakeStreamingLoadPath(PatchDefine.InitManifestFileName);
    string url = AssetPathHelper.ConvertToWWWPath(filePath);
    using (WebDataRequest downloader = new WebDataRequest(url))
    {
        yield return downloader.DownLoad();
        if (downloader.States == EWebRequestStates.Success) 
        {
            PatchHelper.Log(ELogLevel.Log, "Parse app patch manifest.");
            ParseAppPatchManifest(downloader.GetData());
        }
        else
        {
            throw new System.Exception($"Fatal error : Failed download file : {url}");
        }
    }
}

// 解析補丁清單文件相關(guān)接口
public void ParseAppPatchManifest(byte[] data)
{
    if (AppPatchManifest != null)
        throw new Exception("Should never get here.");
    AppPatchManifest = new PatchManifest(true);
    AppPatchManifest.Parse(data);
}

PatchManifest類是一個專門解析AB包清單的類，看代碼也能知道，Parse方法的最終目的，就是把清單的每一行數(shù)據(jù)解析成PatchElement然后加入到字典中存起來等著下載時調(diào)用

/// <summary>
/// 補丁清單文件
/// </summary>
public class PatchManifest
{
    private bool _isParse = false;

    /// <summary>
    /// 資源版本號
    /// </summary>
    public int DllVersion { private set; get; }
    public int ResVersion { private set; get; }
    private bool IsInit = false;

    /// <summary>
    /// 所有打包文件列表
    /// </summary>
    public readonly Dictionary<string, PatchElement> Elements = new Dictionary<string, PatchElement>();

    public PatchManifest(bool isInit = false)
    {
        IsInit = isInit;
    }

    /// <summary>
    /// 解析數(shù)據(jù)
    /// </summary>
    public void Parse(byte[] data)
    {
        using (var ms = new MemoryStream(data))
        {
            using(var br = new BinaryReader(ms))
            {
                Parse(br);
            }
        }
    }

    public void ParseFile(string filePath)
    {
        using (var fs = File.OpenRead(filePath))
        {
            using (var br = new BinaryReader(fs))
            {
                Parse(br);
            }
        }
    }

    /// <summary>
    /// 解析數(shù)據(jù)
    /// </summary>
    public void Parse(BinaryReader br)
    {
        if (br == null)
            throw new Exception("Fatal error : Param is null.");
        if (_isParse)
            throw new Exception("Fatal error : Package is already parse.");

        _isParse = true;

        // 讀取版本號            
        DllVersion = br.ReadInt32();
        ResVersion = br.ReadInt32();

        GameVersion.PatchResDesc = ResVersion + "   dllVer:" + DllVersion;
        int fileCount = br.ReadInt32();
        // 讀取所有Bundle的數(shù)據(jù)
        for(var i = 0; i < fileCount; i++)
        {
            var ele = PatchElement.Deserialize(br, IsInit);
            if (Elements.ContainsKey(ele.Name))
                throw new Exception($"Fatal error : has same pack file : {ele.Name}");
            Elements.Add(ele.Name, ele);
        }
    }
}

PatchElement是AB包清單每一行數(shù)據(jù)的封裝，PatchManifest的Parse里會循環(huán)創(chuàng)建一個Elements字典保存這些數(shù)據(jù)。

public class PatchElement
{
    /// <summary>
    /// 文件名稱
    /// </summary>
    public string Name { private set; get; }

    /// <summary>
    /// 文件MD5
    /// </summary>
    public string MD5 { private set; get; }

    /// <summary>
    /// 文件版本
    /// </summary>
    public int Version { private set; get; }

    /// <summary>
    /// 文件大小
    /// </summary>
    public long SizeKB { private set; get; }

    /// <summary>
    /// 構(gòu)建類型
    /// buildin 在安裝包中
    /// ingame  游戲中下載
    /// </summary>
    public string Tag { private set; get; }

    /// <summary>
    /// 是否是安裝包內(nèi)的Patch
    /// </summary>
    public bool IsInit { private set; get; }

    /// <summary>
    /// 下載文件的保存路徑
    /// </summary>
    public string SavePath;

    /// <summary>
    /// 每次更新都會先下載到Sandbox_Temp目錄，防止下到一半重啟導(dǎo)致邏輯不一致報錯
    /// temp目錄下的文件在重新進入更新流程時先校驗md5看是否要跳過下載
    /// </summary>
    public bool SkipDownload { get; set; }


    public PatchElement(string name, string md5, int version, long sizeKB, string tag, bool isInit = false)
    {
        Name = name;
        MD5 = md5;
        Version = version;
        SizeKB = sizeKB;
        Tag = tag;
        IsInit = isInit;
        SkipDownload = false;
    }

    public void Serialize(BinaryWriter bw)
    {
        bw.Write(Name);
        bw.Write(MD5);
        bw.Write(SizeKB);
        bw.Write(Version);
        if (IsInit)
            bw.Write(Tag);
    }

    public static PatchElement Deserialize(BinaryReader br, bool isInit = false)
    {
        var name = br.ReadString();
        var md5 = br.ReadString();
        var sizeKb = br.ReadInt64();
        var version = br.ReadInt32();
        var tag = EBundlePos.buildin.ToString();
        if (isInit)
            tag = br.ReadString();
        return new PatchElement(name, md5, version, sizeKb, tag, isInit);
    }
}

下面是下載數(shù)據(jù)封裝，本質(zhì)還是 UnityWebRequest文章來源地址http://www.zghlxwxcb.cn/news/detail-557554.html

public class WebDataRequest : WebRequestBase, IDisposable
{
    public WebDataRequest(string url) : base(url)
    {
    }
    public override IEnumerator DownLoad()
    {
        // Check fatal
        if (States != EWebRequestStates.None)
            throw new Exception($"{nameof(WebDataRequest)} is downloading yet : {URL}");

        States = EWebRequestStates.Loading;

        // 下載文件
        CacheRequest = new UnityWebRequest(URL, UnityWebRequest.kHttpVerbGET);
        DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
        CacheRequest.downloadHandler = handler;
        CacheRequest.disposeDownloadHandlerOnDispose = true;
        CacheRequest.timeout = Timeout;
        yield return CacheRequest.SendWebRequest();

        // Check error
        if (CacheRequest.isNetworkError || CacheRequest.isHttpError)
        {
            MotionLog.LogWarning($"Failed to download web data : {URL} Error : {CacheRequest.error}");
            States = EWebRequestStates.Fail;
        }
        else
        {
            States = EWebRequestStates.Success;
        }
    }

    public byte[] GetData()
    {
        if (States == EWebRequestStates.Success)
            return CacheRequest.downloadHandler.data;
        else
            return null;
    }
    public string GetText()
    {
        if (States == EWebRequestStates.Success)
            return CacheRequest.downloadHandler.text;
        else
            return null;
    }
}