Cocoa 中的 FNSubscribe 替换

Posted 2023-03-07

【中文标题】Cocoa 中的 FNSubscribe 替换

【英文标题】：FNSubscribe replacement in Cocoa

【发布时间】：2016-11-17 12:42:44

【问题描述】：

我无法在 CarbonCore 框架中找到“FNSubscribe”方法的替代品。该函数用于监视目录是否有任何变化，并在发生变化时执行回调函数。

/*
*  FNSubscribe()
*  
*  Summary:
*    Subscribe to change notifications for the specified directory.
*  
*  Mac OS X threading:
*    Thread safe since version 10.1
*  
*  Parameters:
*    
*    directoryRef:
*      Directory for which the caller wants notifications
*    
*    callback:
*      Function to call back when a notification arrives
*    
*    refcon:
*      User state carried with the subscription
*    
*    flags:
*      Options for future use (specify kNilOptions, or one of the
*      FNSubscriptionOptions)
*    
*    subscription:
*      Subscription token for subsequent query or unsubscription
*  
*  Availability:
*    Mac OS X:         in version 10.1 and later in CoreServices.framework
*    CarbonLib:        not available in CarbonLib 1.x, is available on Mac OS X version 10.1 and later
*    Non-Carbon CFM:   not available
*/
extern OSStatus  FNSubscribe(const FSRef *directoryRef, FNSubscriptionUPP callback, void *refcon, OptionBits flags, FNSubscriptionRef *subscription) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_1, __MAC_10_8, __IPHONE_NA, __IPHONE_NA);

如何使用 Cocoa 观察目录并最终运行回调函数？

【参考方案1】：

从 OS X 10.5 开始，您可以使用 File System Events（又名 FSEvents）API。