NSFileManager 错误？

发布于 2024-11-29 03:13:29 字数 325 浏览 0 评论 0原文

你能发现这行代码中的错误吗？它返回零！该应用程序完全沙盒化，但启用了下载文件夹访问。

NSArray*array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] error:NULL];
        //array==nil: Why?

[编辑]问题：我无法测试它。它发生在评论机器的来宾帐户上。编译的二进制文件是否有问题，或者您有任何解决此问题的提示吗？

原文

Can you find a bug in this line of code? It returns nil!!
The app is completely sandboxed but Downloads folder access is enabled.

NSArray*array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] error:NULL];
        //array==nil: Why?

[EDIT] Problem: I cannot test it. It is happening on a Guest account of the review machines. Could there be something wrong with the complied binary or have you got any tips how to solve this issue?

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风流物 2024-12-06 03:13:29

尝试读取带有错误句柄的目录来检查发生了什么：

NSError *error = nil;
NSArray*array = [[NSFileManager defaultManager] 
                  contentsOfDirectoryAtPath:
                   [NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] 
                                      error:&error];
if ( !array ) 
     NSLog(@"ERROR: %@", [error description]);

这将为您提供更详细的描述出了什么问题。

要将此错误记录到文件quick'n'dirty，请使用以下消息：

[[error description] writeToFile:@"strangeerrors.log" 
  atomically:NO encoding:NSUTF8StringEncoding error:nil];

Try to read the directory with an error handle to examine what happens:

NSError *error = nil;
NSArray*array = [[NSFileManager defaultManager] 
                  contentsOfDirectoryAtPath:
                   [NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] 
                                      error:&error];
if ( !array ) 
     NSLog(@"ERROR: %@", [error description]);

That will give you a more detailed description what went wrong.

To log this error to a file quick'n'dirty use the following message:

[[error description] writeToFile:@"strangeerrors.log" 
  atomically:NO encoding:NSUTF8StringEncoding error:nil];

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烂柯人 2024-12-06 03:13:29

您是否尝试过替换

[NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"]

为

[@"~/Downloads" stringByExpandingTildeInPath]

？

Have you tried replacing

[NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"]

with

[@"~/Downloads" stringByExpandingTildeInPath]

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深海不蓝 2024-12-06 03:13:29

附加路径组件时不需要添加任何斜线。很简单：

[NSHomeDirectory() stringByAppendingPathComponent:@"Downloads"] ...

对我来说效果很好！

You don't need to put in any slashed when appending path components. It's simply:

[NSHomeDirectory() stringByAppendingPathComponent:@"Downloads"] ...

Works fine for me!

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不打扰别人 2024-12-06 03:13:29

几乎可以肯定这不是真正的问题，但可以说将 @"Downloads/" 附加为路径组件比使用前导斜杠更有意义。在 Cocoa 看来，请求 @"/Downloads/" 的组件将为您提供：

@"/"
@"Downloads"

这可能不是您想要的。

Almost certainly not the real problem here, but arguably it makes more sense to append @"Downloads/" as a path component, rather than with a leading slash. In Cocoa's eyes, asking for the components of @"/Downloads/" will give you: