问题描述
如何在Mac上检查文件是否为别名?到目前为止,这是我的代码:
How can I check if a file is an Alias on Mac? Here is my code so far:
public func getFiles(){
let folderPath = "/Users/timeBro/Desktop/testfolder"
let fileManager = NSFileManager.defaultManager()
let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)!
for url in enumerator.allObjects {
let newurl = NSURL(string: url as! String)
print("\(url as! String)")
print(url);
print(newurl?.isFileReferenceURL())
}
}
如何检查文件的名称和别名?
How can I check if the file is and alias?
推荐答案
更新:我最初错误地认为唯一的选择是使用 CoreFoundation (C API)方法,但实际上并非如此(谢谢): Foundation (ObjC API)类NSURL
确实提供了一种检测Finder别名的方法:
Update: I initially mistakenly assumed that the only option is to use a CoreFoundation (C API) method, but that's not actually true (thanks): the Foundation (ObjC API) class NSURL
does provide a way to detect Finder aliases:
// OSX 10.9+
// Indicates if the specified filesystem path is a Finder alias.
// Returns an optional Boolean: if the lookup failed, such when the path doesn't exist,
// nil is returned.
// Example: isFinderAlias("/path/to/an/alias")
func isFinderAlias(path:String) -> Bool? {
let aliasUrl = NSURL(fileURLWithPath: path)
var isAlias:AnyObject? = nil
do {
try aliasUrl.getResourceValue(&isAlias, forKey: NSURLIsAliasFileKey)
} catch _ {}
return isAlias as! Bool?
}
[不建议使用,除非作为使用UnsafeMutablePointer<Void>
的练习]
使用基于C的CoreFoundation API的方法如下:
[Not recommended, except as an exercise in using UnsafeMutablePointer<Void>
]
Here's how to do it with the C-based CoreFoundation API:
-
IsAliasFile()
在OS X 10.4中已弃用, - 由
FSIsAliasFile()
成功,在10.8中已弃用. - 当前方法是使用
CFURLCopyResourcePropertyForKey()
,在Swift中处理它并不有趣,因为必须在UnsafeMutablePointer<Void>
中使用手动内存管理.
IsAliasFile()
was deprecated in OS X 10.4,- succeeded by
FSIsAliasFile()
, which was deprecated in 10.8. - The current method is to use
CFURLCopyResourcePropertyForKey()
, which isn't fun to deal with in Swift, due to having to use manual memory management withUnsafeMutablePointer<Void>
.
我希望我对内存的管理正确无误:
I hope I got the memory management right:
import Foundation
// Indicates if the specified filesystem path is a Finder alias.
// Returns an optional Boolean: if the lookup failed, such when the path
// doesn't exist, nil is returned.
// Example: isFinderAlias("/path/to/an/alias")
func isFinderAlias(path:String) -> Bool? {
var isAlias:Bool? = nil // Initialize result var.
// Create a CFURL instance for the given filesystem path.
// This should never fail, because the existence isn't verified at this point.
// Note: No need to call CFRelease(fUrl) later, because Swift auto-memory-manages CoreFoundation objects.
let fUrl = CFURLCreateWithFileSystemPath(nil, path, CFURLPathStyle.CFURLPOSIXPathStyle, false)
// Allocate void pointer - no need for initialization,
// it will be assigned to by CFURLCopyResourcePropertyForKey() below.
let ptrPropVal = UnsafeMutablePointer<Void>.alloc(1)
// Call the CoreFoundation function that copies the desired information as
// a CFBoolean to newly allocated memory that prt will point to on return.
if CFURLCopyResourcePropertyForKey(fUrl, kCFURLIsAliasFileKey, ptrPropVal, nil) {
// Extract the Bool value from the memory allocated.
isAlias = UnsafePointer<CFBoolean>(ptrPropVal).memory as Bool
// Since the CF*() call contains the word "Copy", WE are responsible
// for destroying (freeing) the memory.
ptrPropVal.destroy()
}
// Deallocate the pointer
ptrPropVal.dealloc(1)
return isAlias
}
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