从 .txt 文件中读取 - 目标 C [重复]

Question

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

我正在使用以下代码行::

- (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);
}

edit.txt的内容是：

= WWWW =
[[Category:ssss]]

我要做的是从文件edit.txt 中读取并将其内容存储在一个字符串中。但是，在 NSLogging 上，我得到 null 对应的 saveString。

我在gdb:::

得到了以下输出

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`

有人可以帮我解决错误吗？我无法弄清楚。谢谢和问候。

Answer 1

我认为您的 TXT 文件路径有误。看看你构建saveFilePath的方式，也许：

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

Answer 2

如果你尝试：

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 3

检查您的文档是否包含edit.txt文件。

编辑：

- (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 的路径为：/Users/nuzhat.zari/Library/Application Support/iPhone Simulator/5.0/Applications/9BFCE2B5-C976-4EF6-91DF-DA4ABCD04788/Documents。

确保您的文件路径也与此类似。

Answer 4

好的，那么我用来从 .txt 文件中读取数据的内容如下

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

现在一个函数读取返回NSString 作为返回对象的文件。 我对这个函数的调用如下

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

现在的功能

-(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;
}

希望对你有帮助

快乐编码:)