Le 17 juil. 08 à 23:13, Jean-Daniel Dupas a écrit :
Le 17 juil. 08 à 23:03, Uli Kusterer a écrit :
On 17.07.2008, at 12:50, Mitchell Livingston wrote:
I need to pass the location to a c library and reset the location
in this library when the application is moved, so I need a way to
know when the app is moved.
How can I call it again if I don't know it moved? Waiting until it
fails is a bit too late in the process. Sure, chances are the app
won't move, but why should it ever fail? Storing it in the library
folder is not a real good option.
As someone else said, use a kqueue to detect the app move. I wrote
a nice little wrapper class around kqueues for uses like this, find
it at
<http://www.zathras.de/angelweb/sourcecode.htm#UKKQueue>
Watch your application bundle folder with that, and when it
notifies you that you've been moved, you can call into your
library, passing whatever NSBundle pathForResource: returns then.
Just be aware that Cocoa itself is kinda stupid about coping with
the current app's bundle being moved (different from Carbon,
funnily enough). So, while your library might still access the
correct folders, the rest of your app may still go down in flames.
Come to think of it, I'm not even sure whether NSBundle doesn't
cache its location, so you might get the old path back. But I guess
since the kqueue tells you where it got moved, you could deduce the
path anyway.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
Correct me if I'm wrong, but kqueue will not work if you move a
folder that contains the applications (and not the app directly).
An other way to do it is to get the file path you want to track at
startup. Convert it into FSRef, and cache this ref. Then resolve the
path using this FSRef each time you need it.
And now that I think about it. There is really few chance that your
application path changes while your application is active. So you may
listen the applicationDidBecomeActive notification and check your
application path at this time (resolve it using the cached FSRef and
compare the result against a cached path. If the path are differents,
update your library).
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