在可可,你可以得到一个文件的属性如下Cocoa和CoreFoundation返回的文件属性有什么区别?
NSString *path = @"/path/to/some/file";
NSError *err = ......;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:&err];
NSLog(@"%@", dic);
,它将返回键的目录,例如现在
{
NSFileCreationDate = "2009-12-02 10:03:38 +0000";
NSFileExtensionHidden = 0;
NSFileGroupOwnerAccountID = 80;
NSFileGroupOwnerAccountName = admin;
NSFileHFSCreatorCode = 0;
NSFileHFSTypeCode = 0;
NSFileModificationDate = "2009-12-02 19:20:54 +0000";
NSFileOwnerAccountID = 501;
NSFileOwnerAccountName = Tony;
NSFilePosixPermissions = 511;
NSFileReferenceCount = 1;
NSFileSize = 496988;
NSFileSystemFileNumber = 5187496;
NSFileSystemNumber = 234881029;
NSFileType = NSFileTypeRegular;
}
,您还可以使用CoreFoundation
MDItem
到获取文件属性
NSString *path = @"/path/to/some/file";
MDItemRef mdItem = MDItemCreate(kCFAllocatorDefault, (__bridge CFStringRef)path);
CFArrayRef arr = MDItemCopyAttributeNames(mdItem);
CFDictionaryRef dic = MDItemCopyAttributes(mdItem, arr);
NSLog(@"%@", dic);
而且它会返回像这样的东西
{
kMDItemAuthors = (
"Some One"
);
kMDItemContentCreationDate = "2009-12-02 10:03:38 +0000";
kMDItemContentModificationDate = "2009-12-02 19:20:54 +0000";
kMDItemContentType = "org.openxmlformats.presentationml.presentation";
kMDItemContentTypeTree = (
"org.openxmlformats.presentationml.presentation",
"org.openxmlformats.openxml",
"public.zip-archive",
"com.pkware.zip-archive",
"public.data",
"public.item",
"com.apple.bom-archive",
"public.archive",
"public.presentation",
"public.composite-content",
"public.content"
);
kMDItemDateAdded = "2011-08-16 07:52:53 +0000";
kMDItemDisplayName = "Some File.pptx";
kMDItemFSContentChangeDate = "2009-12-02 19:20:54 +0000";
kMDItemFSCreationDate = "2009-12-02 10:03:38 +0000";
kMDItemFSCreatorCode = 0;
kMDItemFSFinderFlags = 0;
kMDItemFSHasCustomIcon = 0;
kMDItemFSInvisible = 0;
kMDItemFSIsExtensionHidden = 0;
kMDItemFSIsStationery = 0;
kMDItemFSLabel = 0;
kMDItemFSName = "Some File.pptx";
kMDItemFSNodeCount = 496988;
kMDItemFSOwnerGroupID = 80;
kMDItemFSOwnerUserID = 501;
kMDItemFSSize = 496988;
kMDItemFSTypeCode = 0;
kMDItemKind = "Microsoft PowerPoint presentation";
kMDItemLogicalSize = 496988;
kMDItemPhysicalSize = 499712;
kMDItemTitle = "PowerPoint Presentation";
}
我的问题是,这两种查找文件属性的方法有什么区别?似乎有一些等价但不是所有的时间,哪个更好?为什么有这两种方式呢?
'@“/ path/to/some/file”'是路径,而不是URL。出于这个原因,“'url”是该变量的错误名称。 – 2011-12-26 19:17:35
@Peter明白了,感谢您的指针 – Tony 2011-12-26 20:45:36