How to determine if a file copy is completed using cocoa

2018-06-08 08:56:40

I am developing folder watcher application for MAC in XCode using Foundation framework and FSEvents API. I need to know whether the file has been completely copied to the destination before I open the file for other operation. Is there any way of knowing it? please advice

From simply studying the FSEvents API I would say that what you want is not possible. I could be mistaken, though, I have never used FSEvents myself. The asker of this question has solved the problem by separately monitoring the new file with lsof .

I noticed that FSEvents API sends "create" event at beginning and "create-and-modify" at the end. On my project I used FSEventsStream with zero latency, and "NoDefer" flag on creation. Watching for "Modify" only events may give you information that file copy is completed.

you can check that whether the file you want to open is exist or not? and act accordingly.

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