How to determine if a file copy is completed using cocoa

Question

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

score 1 · Answer 1 · answered Dec 04 '16 at 09:55

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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.

answered Dec 04 '16 at 09:55

Danil Korotenko

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Using "lsof" will give you no sense, because different processes may open and close the file in undefined order. In addition you will ned to filter those processes names. – Danil Korotenko Dec 04 '16 at 10:01
"Finder" may take the file opened for a long time after copy finished. – Danil Korotenko Dec 04 '16 at 10:02

score 0 · Answer 2 · answered Feb 04 '12 at 09:09

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

answered Feb 04 '12 at 09:09

Prashant Bhayani

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score 0 · Accepted Answer · edited May 23 '17 at 11:53

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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.

edited May 23 '17 at 11:53

Community

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answered Feb 04 '12 at 09:38

herzbube

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How to determine if a file copy is completed using cocoa

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