无法在 XCODE 4.2 中读取文件，但在 4.0 中可以工作？

发布于 2024-12-14 08:22:10 字数 896 浏览 1 评论 0原文

我已经从 XCODE 4 升级到 4.2，现在遇到了问题。

以下代码在 4.2 之前工作，用于读取“filePath”中的文件：

// Fill myString with questions from the .txt file and then read .txt file
NSString *filePath = whatFile; 
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath];

// Load array
NSArray* myArray = [myString componentsSeparatedByString:@"\r"];
NSLog (@"\n \n Number of elements in myArray = %i", [myArray count]);

在 4.2 中，以下代码行中的“initWithContentsOfFile”已被弃用：

NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath];

...并且应该根据手册替换为以下内容：

NSString *myString = [NSString stringWithContentsOfFile:filePath encoding: NSUTF8StringEncoding error:&err];

并且我无法得到这个通过替换代码行来读取同一文件中的记录。顺便说一句，我已经定义了 &err。

当我 NSLog myString 时，我得到（null）。

我有点迫切地想解决这个问题，非常感谢任何帮助。

干杯

原文

I have upgraded from XCODE 4 to 4.2 and now i have problems.

The following code worked pre 4.2 to read the file in "filePath":

// Fill myString with questions from the .txt file and then read .txt file
NSString *filePath = whatFile; 
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath];

// Load array
NSArray* myArray = [myString componentsSeparatedByString:@"\r"];
NSLog (@"\n \n Number of elements in myArray = %i", [myArray count]);

With 4.2 the "initWithContentsOfFile" in the following code line is deprecated:

NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath];

...and should be replaced with the below according to the manual:

NSString *myString = [NSString stringWithContentsOfFile:filePath encoding: NSUTF8StringEncoding error:&err];

and i can not get this to read the records in the same file by replacing the code line. BTW, i have defined the &err.

When i NSLog myString i get (null).

I am getting a bit desperate to solve this and would very much appreciate any help.

Cheers

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涫野音 2024-12-21 08:22:10

NSLog err 变量（如果有错误）。还有NSLog filePath。

也许编码不是 UTF-8，您确定编码吗？

最好的非 UTF-8 编码是 NSMacOSRomanStringEncoding，它支持 8 位字符。

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笙痞 2024-12-21 08:22:10

尝试：

    NSError* error = nil;
    NSStringEncoding encoding;
    NSString *fileContent = [NSString stringWithContentsOfFile:filePath usedEncoding:&encoding error:&error];

如果这不起作用，请尝试使用您的代码：NSASCIIStringEncoding

Try :

    NSError* error = nil;
    NSStringEncoding encoding;
    NSString *fileContent = [NSString stringWithContentsOfFile:filePath usedEncoding:&encoding error:&error];

If that does not works, try in your code : NSASCIIStringEncoding

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场罚期间 2024-12-21 08:22:10

该文件可能不包含 UTF8 编码的字符串。请参阅苹果的文档，其中有一个读取不知道编码的文件的示例：使用未知编码读取数据

您需要使用[string|init]WithContentsOfFile:usedEncoding:error 方法，如果失败，在最终向用户呈现错误消息之前，您还可以尝试其他一些操作（例如，尝试将其读取为NSAttributedString）。

例如，您可以这样做：

// Fill myString with questions from the .txt file and then read .txt file
NSString *filePath = whatFile; 
NSStringEncoding encoding;
NSError *error;
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath usedEncoding:&encoding error:&error];

if (!myString) {
  myString = [[NSString alloc] encoding:NSUTF8StringEncoding error:&error]
}

if (!myString) {
  myString = [[NSString alloc] encoding:NSISOLatin1StringEncoding error:&error]
}

if (!myString) {
  NSLog(@"error: %@", error);
  return;
}


// Load array
NSArray* myArray = [myString componentsSeparatedByString:@"\r"];
NSLog (@"\n \n Number of elements in myArray = %i", [myArray count]);

The file probably doesn't contain a UTF8 encoded string. See apple's documentation, which has an example of reading a file where you do not know the encoding: Reading data with an unknown encoding

You need to use the [string|init]WithContentsOfFile:usedEncoding:error method, and if that fails there are a few more things you can try before finally presenting an error message to the user (for example, try reading it as an NSAttributedString).

For example, you could do this:

// Fill myString with questions from the .txt file and then read .txt file
NSString *filePath = whatFile; 
NSStringEncoding encoding;
NSError *error;
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath usedEncoding:&encoding error:&error];

if (!myString) {
  myString = [[NSString alloc] encoding:NSUTF8StringEncoding error:&error]
}

if (!myString) {
  myString = [[NSString alloc] encoding:NSISOLatin1StringEncoding error:&error]
}

if (!myString) {
  NSLog(@"error: %@", error);
  return;
}


// Load array
NSArray* myArray = [myString componentsSeparatedByString:@"\r"];
NSLog (@"\n \n Number of elements in myArray = %i", [myArray count]);

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