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Re: DiskArb DiskChangedCallback bug?



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On Jun 12, 2006, at 1:40 PM, Dan Markarian wrote:

Hi Brian,

DADiskDescriptionChangedCallback does notify you when a property of a disk has changed, including whether it is mounted or not, however, it does not notify you of the existence of the disk. You must also subscribe to DADiskAppearedCallback and DADiskDisappearedCallback. It is possible that a disk is already mounted when we tell you of its existence.


Ok, my thinking was, the disk is inserted after I've already registered my callback so a change from attached to mounted would be sent. When a disk is attached, there is no mount point, but apparently DA can see attach/mount as a single event and that's where the confusion was.


I've switched to DADiskAppearedCallback to detect a mount and still use Changed to detect the unmount. This now works.

Thanks.

P.S. It would be nice to see the documentation clarify this situation.

Dan

Le 12 Jun 2006 à 1:58 PM, Brian Bergstrand a écrit :

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On Jun 12, 2006, at 12:49 PM, Chris Sarcone wrote:

Brian --

Nevermind. I was looking at the wrong API.

As for using DARegisterDiskDescriptionChangedCallback() for mounts, I think that's incorrect. DARegisterDiskDescriptionChangedCallback() is meant to track disk that are already mounted and changing either their name or path. I think your really want DARegisterDiskAppearedCallback().


Hmm, won't that be called when the disk appears in IOKit and not when it's mounted? I don't really care about the former. Or will it be called both for attach and mount? If that's the case, then I could use the volumePath key in the Disk dictionary to determine if it's being mounted.


Also, if ChangedCallback() is not supposed to be used, then the documentation should be clarified:

/*!
* @constant kDADiskDescriptionWatchVolumePath
* Predefined CFArray object containing a set of disk description keys appropriate for
* watching volume mount changes using DARegisterDiskDescriptionChangedCallback().
*/


extern CFArrayRef kDADiskDescriptionWatchVolumePath;

I take "watching volume mount changes", to mean changing from mounted - -> unmounted OR vise-versa. "watching volume un-mounts" would be a better term if that is all ChangedCallback does.

Thanks for the quick response!


-- Chris


On Jun 12, 2006, at 10:42 AM, Chris Sarcone wrote:

Brian --

DARegisterDiskDescriptionChangedCallback(daSession, NULL, kDADiskDescriptionWatchVolumePath,
DiskArbCallback_ChangeNotification, NULL);

The third argument is supposed to be a CFArrayRef of keys to watch, not a CFDictionaryRef. You might want to try fixing that, then retest...







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References: 
 >DiskArb DiskChangedCallback bug? (From: Brian Bergstrand <email@hidden>)
 >Re: DiskArb DiskChangedCallback bug? (From: Chris Sarcone <email@hidden>)
 >Re: DiskArb DiskChangedCallback bug? (From: Chris Sarcone <email@hidden>)
 >Re: DiskArb DiskChangedCallback bug? (From: Brian Bergstrand <email@hidden>)
 >Re: DiskArb DiskChangedCallback bug? (From: Dan Markarian <email@hidden>)



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