iOS中的文件讀寫錯誤

Question

我已經使用以下代碼進行文件讀取和寫入。

private void StorePuzzleData() 
{ 
    FileInfo fileInfo = new FileInfo (Application.persistentDataPath + "\\" + difficultyLevel + puzzleId + ".txt"); 

    if (fileInfo.Exists) 
     fileInfo.Delete(); 

    string fileData = string.Empty; 

    foreach (CellInformation cellInfo in cellInfoList) 
     fileData += cellInfo.RowIndex + "#" + cellInfo.ColIndex + "#" + cellInfo.number + "#" + cellInfo.CellColor + "#" + cellInfo.CellDisplayColor + "#" + (cellInfo.IsGroupComplete ? 1 : 0) + ","; 

    StreamWriter streamWriter = fileInfo.CreateText(); 
    streamWriter.WriteLine (fileData); 
    streamWriter.Close(); 

    DataStorage.StorePuzzleTimePassed (difficultyLevel, puzzleId, GameController.gamePlayTime); 

} 

private void ReadPuzzleData() 
{ 
    // format: rownumber, colnumber, number, cellcolor, celldisplaycolor, isgroupcomplete 

    StreamReader streamReader = File.OpenText (Application.persistentDataPath + "\\" + difficultyLevel + puzzleId + ".txt"); 
    string fileData = streamReader.ReadLine(); 
} 

但是我在實際iOS設備運行中遇到了以下錯誤。此代碼在iMac以及Android設備中正確工作。

請給我一些建議什麼樣的變化，我需要做的，使這是正確的。

Answer 1

看來你在類Unix（Apple Mac OS）環境中使用Windows風格的路徑。請注意，你有喜歡

C:\Users\Maxi\Desktop 

在類Unix系統，但是像

/var/mobile/Containers 

你會發現，在錯誤的道路已混合向前和向後斜槓，這使得反斜線路徑窗口路徑無效。

/var/mobile/Containers/Data/Application/2.....\debutan1.txt 

始終生成正確路徑的正確方法是使用Path.Combine(string, string)函數。這將結合使用正確的目錄路徑分隔符的兩個路徑，也可以通過Path.DirectorySeparatorChar獨立訪問。

因此，爲了使你的代碼是正確的，你會做

using System.IO; /* must be imported */ 

private void StorePuzzleData() 
{ 
    FileInfo fileInfo = new FileInfo (Path.Combine(Application.persistentDataPath, difficultyLevel + puzzleId + ".txt")); 

    if (fileInfo.Exists) 
     fileInfo.Delete(); 

    string fileData = string.Empty; 

    foreach (CellInformation cellInfo in cellInfoList) 
     fileData += cellInfo.RowIndex + "#" + cellInfo.ColIndex + "#" + cellInfo.number + "#" + cellInfo.CellColor + "#" + cellInfo.CellDisplayColor + "#" + (cellInfo.IsGroupComplete ? 1 : 0) + ","; 

    StreamWriter streamWriter = fileInfo.CreateText(); 
    streamWriter.WriteLine (fileData); 
    streamWriter.Close(); 

    DataStorage.StorePuzzleTimePassed (difficultyLevel, puzzleId, GameController.gamePlayTime); 

} 

private void ReadPuzzleData() 
{ 
    // format: rownumber, colnumber, number, cellcolor, celldisplaycolor, isgroupcomplete 

    StreamReader streamReader = File.OpenText (Path.Combine(Application.persistentDataPath, difficultyLevel + puzzleId + ".txt")); 
    string fileData = streamReader.ReadLine(); 
} 

如果這仍然給出了一個「拒絕訪問」的錯誤一定是因爲filepermissions的。然後發佈ls -la <thatpath>的輸出。