iPhone（iOS）：将文件从主包复制到文档文件夹会导致崩溃 [英] iPhone (iOS): copying files from main bundle to documents folder causes crash

问题描述

我正在尝试设置我的应用程序，以便在首次启动时，位于主包中Populator文件夹中的一系列文件被复制到文档目录中。

I am trying to set up my application so that on first launch, a series of files located in the "Populator" folder in the main bundle are copied into the documents directory.

我目前的实现如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
  NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Populator"];
  NSString *folderPath = [documentsDirectory stringByAppendingPathComponent:@"Files"];
  NSLog(@"Source Path: %@\n Documents Path: %@ \n Folder Path: %@", sourcePath, documentsDirectory, folderPath);

  NSError *error;

  [[NSFileManager defaultManager] copyItemAtPath:sourcePath 
                                        toPath:folderPath
                                         error:&error];

  NSLog(@"Error description-%@ \n", [error localizedDescription]);
  NSLog(@"Error reason-%@", [error localizedFailureReason]);
  ....
  return YES;
}

然而，第一次使用以下控制台消息运行时会崩溃（但是文件被复制）。下次打开应用程序时，它不会崩溃。

However this crashes the first time it is run with the following console messages (but the files are copied over). The next time the app is opened, it does not crash.

    2010-07-13 15:14:26.418 AppName[5201:207] Source Path: /Users/jack/Library/Application Support/iPhone Simulator/3.2/Applications/1076C1FA-60B0-4AC7-8CD4-74F81472DAE6/AppName.app/Populator
 Documents Path: /Users/jack/Library/Application Support/iPhone Simulator/3.2/Applications/1076C1FA-60B0-4AC7-8CD4-74F81472DAE6/Documents 
 Folder Path: /Users/jack/Library/Application Support/iPhone Simulator/3.2/Applications/1076C1FA-60B0-4AC7-8CD4-74F81472DAE6/Documents/Files
2010-07-13 15:14:26.466 AppName[5201:207] *** +[AppNameAppDelegate localizedDescription]: unrecognized selector sent to class 0xa79c
2010-07-13 15:14:26.475 AppName[5201:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[AppNameAppDelegate localizedDescription]: unrecognized selector sent to class 0xa79c'
2010-07-13 15:14:26.495 AppName[5201:207] Stack: (
    40911435,
    2569270537,
    41183227,
    40645910,
    40642578,
    9142,
    2815466,
    2819475,
    2844680,
    2826401,
    2858055,
    49271164,
    40452156,
    40448072,
    2817668,
    2850273,
    8776,
    8630
)

有没有人对什么出错有任何建议？我已经设置了一些代码来实现仅在首次启动时功能，但为了清楚起见，未将其包含在此处。

Does anyone have any suggestions as to what is going wrong? I already have some code set up to implement the "only on first launch" functionality, but have not included it here for clarity.

谢谢

推荐答案

我对iPhone编程或目标C了解不多，但出于好奇，如果复制操作实际成功，那么错误是什么？如果没有错误，它可能是崩溃的日志行吗？

I don't know a lot about iPhone programming or objective C, but out of curiosity, what is error in that case if the copy operation actually succeeded? Could it be the log lines that are crashing if there was no error?

另外，你是否可以复制像这样的子目录的全部内容？ （同样，我对iOS API不熟悉，根据我所知道的其他语言/ API识别可能的错误来源）

[edit] Also, are you allowed to copy the entire contents of a subdirectory like that? (Again, I'm unfamiliar with the iOS API, just identifying possible sources of error based on what I know of other languages/APIs)

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