【问题标题】:Unity - IOS persistentDataPath access denied // Could not open databaseUnity - IOS persistentDataPath access denied // 无法打开数据库
【发布时间】:2017-02-15 09:29:10
【问题描述】:

我正在尝试从我的 streamingAssets 中恢复一个文件并在 persistentDataPath 中复制它。

问题是iOS拒绝访问persistentDataPath,所以我无法写入文件,谁能告诉我为什么?

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

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

更新:StaticDatas.databasePath = persistentDataPath

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

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“找不到路径的一部分”(即使它在if语句中找到它,wtf?)

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

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();
}

所以正确的路径似乎是:

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

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

更新 4:

好的,我想我知道问题出在哪里(即使我不明白):

我现在可以从流媒体资产中获取数据并将其复制到persistentDatapath,但是当我创建与文件的连接时,SQLite 会抛出异常:

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”

但是,在 SQLException 中,它显示相同,但​​ Documents 和 database.db 之间没有斜线

【问题讨论】:

  • this 的副本?
  • 会看的,谢谢
  • 我很困惑......你为什么要问Application.persistantDataPath,但在你的代码中你使用的是Application.dataPath?,我很确定answers.unity3d.com/questions/209108/…会回答你的问题。跨度>
  • 是的,我的错,我忘了提到 Static.databasePath 是设置在 persistentDataPath 的静态字符串。 (创建文件时使用)
  • 我链接的那个解决方案有效吗?

标签: c# ios unity3d


【解决方案1】:

在 IOS 上,可以通过以下方式访问流媒体资产的正确路径:

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(我感到羞耻) 事实上,第二个是让它成为错误(两者的变量相同),这是我的错误。

谢谢大家。

【讨论】:

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