Android Unity c#：写入保存游戏数据的 UnauthorizedAccessException

Question

我正在 Android 中调试 Unity 游戏，在 Unity 编辑器中一切正常。我在 Android 上保存当前游戏数据时收到 UnauthorizedAccessException。

我正在写入 persistentDataPath，所以我不明白为什么访问被阻止。

这是使用 Logcat:

的控制台日志

<i>AndroidPlayer(motorola_Moto_G_(5)@192.168.0.26)</i> UnauthorizedAccessException: 
Access to the path "/current.sg" is denied.
at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x0028a] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/FileStream.cs:320 
  at System.IO.FileStream..ctor (System.String path, FileMode mode) [0x00000] in <filename unknown>:0 
  at SaveLoadManager.SaveGame (.Game currentGame) [0x0002a] in F:\Work\Magister\Magister\Magister\Assets\Scripts\SaveLoadManager.cs:16 
  at PlayerController.FixedUpdate () [0x0058e] in F:\Work\Magister\Magister\Magister\Assets\Scripts\PlayerController.cs:244

PlayerController 运行在 FixedUpdate() 循环中的相关代码：

if (!gameSaved)
{
    SaveLoadManager.SaveGame(gameManager.GetComponent<Game>());
    gameSaved = true;
}

SaveLoadManager 的 SaveGame 函数：

public static void SaveGame(Game currentGame)
{
    string saveGameFileName = Path.DirectorySeparatorChar + "current.sg";
    string filePath = Path.Combine(Application.persistentDataPath, saveGameFileName);
    BinaryFormatter bf = new BinaryFormatter();
    FileStream file = new FileStream(filePath, FileMode.Create);
    GameData data = new GameData(currentGame);
    bf.Serialize(file, data);
    file.Close();
}

read/write权限在AndroidManifest.xml:

<uses-permission
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    android:maxSdkVersion="18" />

<uses-permission
    android:name="android.permission.READ_EXTERNAL_STORAGE"
    android:maxSdkVersion="18" />

Answer 1

在写入该路径之前，您必须检查 Directory.Exists 目录是否存在。如果没有，请使用 Directory.CreateDirectory 创建它。

请注意，将文件直接保存到 Application.persistentDataPath 不是一个好主意。您必须先在其中创建一个文件夹，然后将文件保存在该文件夹中。所以 Application.persistentDataPath/yourcreatedfolder/yourfile.extension 没问题。通过这样做，您的代码也将适用于 iOS.

代码应该是这样的：

string saveGameFileName = "current";
string filePath = Path.Combine(Application.persistentDataPath, "data");
filePath = Path.Combine(filePath, saveGameFileName + ".sg");


//Create Directory if it does not exist
if (!Directory.Exists(Path.GetDirectoryName(filePath)))
{
    Directory.CreateDirectory(Path.GetDirectoryName(filePath));
}

try
{
    BinaryFormatter bf = new BinaryFormatter();
    FileStream file = new FileStream(filePath, FileMode.Create);
    GameData data = new GameData(currentGame);
    bf.Serialize(file, data);
    file.Close();
    Debug.Log("Saved Data to: " + filePath.Replace("/", "\"));
}
catch (Exception e)
{
    Debug.LogWarning("Failed To Save Data to: " + filePath.Replace("/", "\"));
    Debug.LogWarning("Error: " + e.Message);
}

Android Unity c#：写入保存游戏数据的 UnauthorizedAccessException

Android Unity c# : UnauthorizedAccessException writing save game data

c#

android

unity3d

unauthorizedaccessexcepti