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Only allowing a file to be opened by one app

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Only allowing a file to be opened by one app

Subject: Only allowing a file to be opened by one app
From: Andy Bettis <email@hidden>
Date: Wed, 1 Jul 2009 16:47:03 +0100

Hi,

I'd like to set up my app so that if one user has a file open with it another user cannot open the file. This only needs to limit access by copies of my app, no need to block out any other process.

In the past I'd just leave a write access path open when the file was opened from within my app - this would prevent anyone else from getting write access (and therefore opening the file) and has the bonus that if the app was closed down unexpectedly (these things happen) then the 'lock' was removed. This doesn't happen with default NSDocument based apps (like mine) - is there a way of doing it? Or a better way of setting exclusive access?

Any help gratefully appreciated.

Love,

Andy
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