[英]Monitoring a directory for changes in OSX without fsevent
是否有 fsevent 的替代品或某种包装器?
我正在尝试监视特定文件夹以更改具有特定扩展名的文件。
UKKQueue是一个不错的包装,用于内核队列事件监视-文档中提到的替代方法。
如今,您可以使用 GCD 来监控文件夹,而无需任何其他依赖项:
import Foundation
@objc public class DirectoryWatcher : NSObject {
override public init() {
super.init()
}
deinit {
stop()
}
public typealias Callback = (_ directoryWatcher: DirectoryWatcher) -> Void
@objc public convenience init(withPath path: String, callback: @escaping Callback) {
self.init()
if !watch(path: path, callback: callback) {
assert(false)
}
}
private var dirFD : Int32 = -1 {
didSet {
if oldValue != -1 {
close(oldValue)
}
}
}
private var dispatchSource : DispatchSourceFileSystemObject?
@objc public func watch(path: String, callback: @escaping Callback) -> Bool {
// Open the directory
dirFD = open(path, O_EVTONLY)
if dirFD < 0 {
return false
}
// Create and configure a DispatchSource to monitor it
let dispatchSource = DispatchSource.makeFileSystemObjectSource(fileDescriptor: dirFD, eventMask: .write, queue: DispatchQueue.main)
dispatchSource.setEventHandler {[unowned self] in
callback(self)
}
dispatchSource.setCancelHandler {[unowned self] in
self.dirFD = -1
}
self.dispatchSource = dispatchSource
// Start monitoring
dispatchSource.resume()
// Success
return true
}
@objc public func stop() {
// Leave if not monitoring
guard let dispatchSource = dispatchSource else {
return
}
// Don't listen to more events
dispatchSource.setEventHandler(handler: nil)
// Cancel the source (this will also close the directory)
dispatchSource.cancel()
self.dispatchSource = nil
}
}
像 Apple 的 DirectoryWatcher 示例一样使用它,如下所示:
let directoryWatcher = DirectoryWatcher(withPath: "/path/to/the/folder/you/want/to/monitor/", callback: {
print("the folder changed")
})
销毁 object 将停止观看,或者您可以显式停止它
directoryWatcher.stop()
它应该与 Objective C 兼容(未测试)。 使用它会是这样的:
DirectoryWatcher *directoryWatcher = [DirectoryWatcher.alloc initWithPath: @"/path/to/the/folder/you/want/to/monitor/" callback: ^(DirectoryWatcher *directoryWatcher) {
NSLog(@"the folder changed")
}];
停止它是相似的
[directoryWatcher stop];
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