閱讀從.txt文件 - 目標C

Question

可能重複：
Read Text file Programmatically using Objective-C

我使用的代碼以下行::

- (void)sync:(NSString *)savedName{ 

NSLog(@"saved name is this :: %@", savedName); 

NSString *savedDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 
NSString *saveFilePath = [savedDir stringByAppendingPathComponent:savedName]; 
saveFilePath = [saveFilePath stringByAppendingPathComponent:@"edit.txt"]; 

NSString *saveString = [NSString stringWithContentsOfFile:saveFilePath encoding:NSUTF8StringEncoding error:nil]; 

NSLog(@"saveString is :: %@ savedName : %@ savefilepath : %@", saveString, savedName, saveFilePath); 
} 

的內容edit.txt是：

= WWWW = 
[[Category:ssss]] 

我想要做的是從文件edit.txt中讀取並將其內容存儲在一個字符串中。但是，在NSLogging上，我得到null爲saveString。

我在gdb以下輸出::

splitView[838:f803] saveString is :: (null) savedName : xxxx savefilepath : /Users/xxxx/Library/Application Support/iPhone Simulator/5.1/Applications/D4B3A4CF-E7D0-4D25-B3D3A170A329/Documents/xxxx/edit.t‌​xt` 

有人可以幫助我理清錯誤？我無法弄清楚。感謝致敬。

Answer 1

好是如下

NSString *path; 
path = [[NSBundle mainBundle] pathForResource: YOUR_TEXT_FILE_NAME ofType: @"txt"]; 

現在函數讀取返回NSString作爲返回對象的文件。 我在此函數調用是如下

NSString *data = [self readFile: path]]; 

現在的功能

-(NSString *)readFile:(NSString *)fileName 

{ 
    NSLog(@"readFile"); 

    NSString *appFile = fileName;  
    NSFileManager *fileManager=[NSFileManager defaultManager]; 
    if ([fileManager fileExistsAtPath:appFile])   
    { 
     NSError *error= NULL; 
     NSString *resultData = [NSString stringWithContentsOfFile: appFile encoding: NSUTF8StringEncoding error: &error]; 
     if (error == NULL)    
      return resultData; 
    } 
    return NULL; 
} 

希望這將幫助你

編碼快樂:)

Answer 2

我認爲你的TXT文件路徑是錯誤的。檢查了這一點，你正在構建的saveFilePath的方式，也許：

NSString *savedDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 
NSString *saveFilePath = [savedDir stringByAppendingPathComponent:savedName]; 
saveFilePath = [saveFilePath stringByAppendingPathComponent:@"edit.txt"]; 

Answer 3

如果歐嘗試：

NSString *savedDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
NSString *saveFilePath = [savedDir stringByAppendingPathComponent:savedName]; 
//Why do you do that ? saveFilePath = [savedDir stringByAppendingPathComponent:@"edit.txt"]; 

NSString *saveString = [NSString stringWithContentsOfFile:saveFilePath encoding:NSUTF8StringEncoding error:nil]; 

NSLog(@"saveString is :: %@ savedName : %@ savefilepath : %@", saveString, savedName, saveFilePath); 

Answer 4

檢查文檔是否含有edit.txt文件。

編輯：

- (void)sync:(NSString *)savedName{ 

    NSString *filePath = [self applicationDocumentsDirectory]; 
    filePath = [filePath stringByAppendingPathComponent:@"license.txt"]; 
    NSString *saveString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil]; 

    NSLog(@"saveString is :: %@ savedName : %@ savefilepath : %@", saveString, savedName, filePath); 
} 

LICENSE.TXT的路徑是：/Users/nuzhat.zari/Library/Application支持/ iPhone模擬器/ 5.0 /應用/ 9BFCE2B5-C976-4EF6-91DF-DA4ABCD04788 /文檔。

確保您的文件路徑也與此類似。那麼我用來讀取.txt文件數據