为什么NSDirectoryEnumerator在这里拾取隐藏文件？ [英] Why is NSDirectoryEnumerator picking up hidden files here?

问题描述

我需要避免隐藏文件在这枚举，但是.DS_Store文件仍然被添加。

我放在NSLog检查，我得到输出

这可能是显而易见的，但我看不到。

  NSDirectoryEnumerator * dirEnumerator; 
 NSFileManager * fileManager = [[NSFileManager alloc] init]; 
 
 dirEnumerator = [fileManager enumeratorAtURL：item 
 includePropertiesForKeys：[NSArray array] 
 options：NSDirectoryEnumerationSkipsPackageDescendants || NSDirectoryEnumerationSkipsHiddenFiles 
 errorHandler：nil]; 
 
 for（NSURL * urlItem in dirEnumerator）{
 
 //是项目隐藏？ 
 NSNumber * isHidden = nil; 
 if（[urlItem getResourceValue：& isHidden forKey：NSURLIsHiddenKey error：nil]）{
 if（[isHidden isEqual：[NSNumber numberWithInt：1]]）{
 
 NSLog （@isHidden is 1）; 
 continue; 
} 
} 
  

解决方案

，真正的问题是，你使用错误的运算符来指定掩码：

  NSDirectoryEnumerationSkipsPackageDescendants || NSDirectoryEnumerationSkipsHiddenFiles 
  

执行Boolean OR code> 1 ，这不是一个有用的选项掩码。您需要使用单个管道：

  NSDirectoryEnumerationSkipsPackageDescendants | NSDirectoryEnumerationSkipsHiddenFiles 
  

这是按位 OR p>

老问答：

您需要实际请求您要查看的属性：

  dirEnumerator = [fileManager enumeratorAtURL：item 
 includePropertiesForKeys：[NSArray arrayWithObject：NSURLIsHiddenKey] 
 options：NSDirectoryEnumerationSkipsPackageDescendants || NSDirectoryEnumerationSkipsHiddenFiles 
 errorHandler：nil];从  

< documentation / Cocoa / Reference / Foundation / Classes / NSURL_Class / Reference / Reference.html＃// apple_ref / doc / uid / 20000301-SW39> - [NSURL getResourceValue：forKey：error：] doc：

讨论

到nil是否未为URL定义所请求的资源值。在这种情况下，该方法仍然返回YES。

i need to avoid hidden files in this enumeration, but .DS_Store files are still being added.

i put in the NSLog to check, and i am getting output there.

there's probably something obvious, but i can't see it.

NSDirectoryEnumerator *dirEnumerator;
                NSFileManager *fileManager = [[NSFileManager alloc] init];

                dirEnumerator = [fileManager enumeratorAtURL:item 
                                  includingPropertiesForKeys:[NSArray array]
                                                     options:NSDirectoryEnumerationSkipsPackageDescendants || NSDirectoryEnumerationSkipsHiddenFiles 
                                                errorHandler:nil];

                for (NSURL *urlItem in dirEnumerator) { 

                    // is item hidden ?
                    NSNumber *isHidden = nil;
                    if ([urlItem getResourceValue:&isHidden forKey:NSURLIsHiddenKey error:nil]) {
                        if ([isHidden isEqual:[NSNumber numberWithInt:1]]) {

                            NSLog(@"isHidden is 1");
                            continue;
                        }
                    }

解决方案

Actually, the real problem is that you're using the wrong operator to specify the mask:

NSDirectoryEnumerationSkipsPackageDescendants ||  NSDirectoryEnumerationSkipsHiddenFiles

does Boolean OR, giving you 1, which isn't a useful options mask. You need to use the single pipe:

NSDirectoryEnumerationSkipsPackageDescendants |  NSDirectoryEnumerationSkipsHiddenFiles

which is bitwise OR.

OLD ANSWER:

You need to actually request the properties that you're going to look at:

dirEnumerator = [fileManager enumeratorAtURL:item 
                  includingPropertiesForKeys:[NSArray arrayWithObject:NSURLIsHiddenKey]
                                     options:NSDirectoryEnumerationSkipsPackageDescendants || NSDirectoryEnumerationSkipsHiddenFiles 
                                errorHandler:nil];

from the -[NSURL getResourceValue:forKey:error:] doc:

Discussion
value is set to nil if the requested resource value is not defined for the URL. In this case, the method still returns YES.

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