c# - Unity - IOS persistentDataPath 访问被拒绝//无法打开数据库

Question

我正在尝试从我的 streamingAssets 中恢复一个文件并在 persistentDataPath 中制作一个副本。

问题是访问 persistentDataPath 被 iOS 拒绝，所以我不能写文件，有人能告诉我为什么吗？

代码:

#elif UNITY_IOS
if (File.Exists(Application.dataPath + "/Raw/" + StaticDatas.databaseName))
{
    byte[] bytes = null;
       if (File.Exists(Application.dataPath + "/Raw/" + StaticDatas.databaseName))
       {
        Debug.Log(Application.dataPath + "/Raw/" + StaticDatas.databaseName);
        Debug.Log(StaticDatas.databasePath + StaticDatas.databaseName);
           using (FileStream fileStream = File.OpenRead(Application.dataPath + "/Raw/" + StaticDatas.databaseName))
           {
               bytes = new byte[fileStream.Length];
               fileStream.Read(bytes,0,int.Parse(fileStream.Length+""));
               fileStream.Close();
               fileStream.Dispose();
           }
           FileStream fs = File.Create(StaticDatas.databasePath + StaticDatas.databaseName);
           fs.Write(bytes, 0, bytes.Length);
       }
         _connection = new SQLiteConnection(filePath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
        CreateDB();
}

错误:访问路径/var/mobile/containers/dta/application/manythings/DocumentsDatabaseName.db 被拒绝

iOS: 9.5.3统一:5.5.0f3

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更新:StaticDatas.databasePath = persistentDataPath

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更新 2:

好吧，我完全迷路了......

这是我的代码:

#elif UNITY_IOS

string basePath = Path.Combine(Application.dataPath + "Raw" , StaticDatas.databaseName);
string targetPath = Path.Combine(StaticDatas.databasePath , StaticDatas.databaseName );
Debug.Log(basePath);
Debug.Log(targetPath);
if (File.Exists(basePath))
{
    byte[] bytes = null;

        Debug.Log("base path exists");
           using (FileStream fileStream = File.OpenRead(basePath))
           {
               Debug.Log("create byte array");
               bytes = new byte[fileStream.Length];
               Debug.Log(" READ BYTES");
               fileStream.Read(bytes,0,int.Parse(fileStream.Length+""));
               Debug.Log(" CLOSE");
               fileStream.Close();
               Debug.Log("DISPOSE");
               fileStream.Dispose();
           }
           Debug.Log(" Check if dir exists");
          /* if (!Directory.Exists(StaticDatas.databasePath + "/AnnotationTest.app/database/"))
           {
                Debug.Log(" create folder");
                Directory.CreateDirectory(StaticDatas.databasePath + "/AnnotationTest.app/database/");
           }*/
           Debug.Log("Open file");
           FileStream fs = File.Open(targetPath, FileMode.OpenOrCreate);
         Debug.Log("Write file");
           fs.Write(bytes, 0, bytes.Length);
           Debug.Log(" CLOSE STRREAM");
           fs.Close();
       Debug.Log("Connec close");
         _connection = new SQLiteConnection(targetPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
         Debug.Log("sql connect");
        CreateDB();
        Debug.Log(" db made");
}



if (File.Exists("file:" + Application.dataPath + "/Raw/" + StaticDatas.databaseName));
{
    Debug.Log("file datapath raw databasename");
          byte[] bytes = null;

        Debug.Log("base path exists");
           using (FileStream fileStream = File.OpenRead("file:" + Application.dataPath + "/Raw/" + StaticDatas.databaseName))
           {
               Debug.Log("create byte array");
               bytes = new byte[fileStream.Length];
               Debug.Log(" READ BYTES");
               fileStream.Read(bytes,0,int.Parse(fileStream.Length+""));
               Debug.Log(" CLOSE");
               fileStream.Close();
               Debug.Log("DISPOSE");
               fileStream.Dispose();
           }
            FileStream fs = File.Open(targetPath, FileMode.OpenOrCreate);
         Debug.Log("Write file");
           fs.Write(bytes, 0, bytes.Length);
           Debug.Log(" CLOSE STRREAM");
           fs.Close();

         _connection = new SQLiteConnection(targetPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
        CreateDB();
}

#else
            var loadDb = StaticDatas.databasePath + StaticDatas.databaseName;
            File.Copy(loadDb, filePath);
         _connection = new SQLiteConnection(filePath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
        CreateDB();
#endif

第一个 if 语句确实工作了一会儿(没有 combine)，但现在，花生。

第二个返回 true (Exists)，但是当它到达 using 语句时，它说“Could not find a part of the path”(即使它在 if 语句中找到了它，卧槽？)

-------------------------------------------- --------------------

更新 3

这是一个奇迹!我找到了!嗯，现在，SQLite 无法打开数据库，但我找到了!

string bpa = Application.dataPath + "/Raw/" + StaticDatas.databaseName;

if (File.Exists(bpa))
{
    byte[] b = null;
    using (FileStream fs = File.OpenRead(bpa))
    {
        b = new byte[fs.Length];
        fs.Read(b, 0, int.Parse(fs.Length+""));
        fs.Close();
        fs.Dispose();
    }
    FileStream fsa = File.Open(targetPath, FileMode.OpenOrCreate);
    fsa.Write(b,0, b.Length);
    fsa.Close();
    _connection = new SQLiteConnection(targetPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
        CreateDB();
}
else if (File.Exists(basePath))
{

byte[] b = null;
    using (FileStream fs = File.OpenRead(basePath))
    {
        b = new byte[fs.Length];
        fs.Read(b, 0, int.Parse(fs.Length+""));
        fs.Close();
        fs.Dispose();
    }
    FileStream fsa = File.Open(targetPath, FileMode.OpenOrCreate);
    fsa.Write(b,0, b.Length);
    fsa.Close();
    _connection = new SQLiteConnection(targetPath, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create);
        CreateDB();
}

所以正确的路径应该是:

 string bpa = Application.dataPath + "/Raw/" + StaticDatas.databaseName;

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更新 4:

好吧，我想我知道问题是什么(即使我不明白):

我现在可以从流式 Assets 中获取我的数据并将其复制到持久数据路径，但是当我创建与文件的连接时，SQLite 抛出异常:

Could not open database file

有人知道为什么吗？

-------------------------------------------- ----------------------更新 5:

我做了一个组合来创建路径“targetPath”，在日志中，它显示“/var/mobile/Container/Data/Application/manylettersanddigits/Documents/database.db”

然而，在 SQLException 中，它显示相同但没有 Documents 和 database.db 之间的斜线

Answer 1

在 IOS 上，可以通过以下方式访问流媒体 Assets 的当前路径:

Application.dataPath + "/Raw/" + StaticDatas.databaseName;

在这种情况下，“无法打开数据库文件”是因为我在方法中创建了 2 个连接(我真可耻)事实上，第二个是让它变得错误(两者的变量相同)，这是我的一个错误。

感谢大家。