You can set a breakpoint in the normal document opening methods such as
-[NSDocument initWithContentsOfURL:ofType:error:] to see what URL the versioned
documents are being loaded from.
On 2012-01-22, at 10:06 AM, Martin Hewitson wrote:
>
> On 21, Jan, 2012, at 07:31 PM, Mike Abdullah wrote:
>
>>
>> On 3 Jan 2012, at 15:25, Martin Hewitson wrote:
>>
>>> Dear list,
>>>
>>> I'm investigating getting the new 10.7 Versions stuff working on my
>>> NSPersistentDocument app. In doing that, I've seen a couple of strange
>>> things which I wanted to check on.
>>>
>>> Firstly, all I've done to make it work is to return YES from
>>> +autosavesInPlace.
>>>
>>> Now, what I notice is the following sequence of events:
>>>
>>>
>>> 1) App starts:
>>> windowControllerDidLoadNib <NSWindow: 0x10055d970>
>>> 2) Enter Versions browser
>>> NSDocumentRevisionsDebugMode=YES
>>> <Error>: kCGErrorFailure: CGSDisplayID: App trying to enumerate [0 to
>>> CGSGetNumberOfDisplays()] instead of using CGSGetDisplayList().
>>> Compensating...
>>> <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to
>>> catch errors as they are logged.
>>> windowControllerDidLoadNib <NSWindow: 0x1091939c0>
>>> Entered Versions: NSConcreteNotification 0x108658620 {name =
>>> NSWindowDidEnterVersionBrowserNotification; object = <NSWindow:
>>> 0x10055d970>}
>>> 3) Exit Versions (by clicking Done button in Versions browser)
>>> Window will close <NSWindow: 0x1091939c0> / <NSWindow: 0x1091939c0>
>>> Open windows 1 (logged in windowWillClose:)
>>> Exited Versions: NSConcreteNotification 0x1091a22c0 {name =
>>> NSWindowDidExitVersionBrowserNotification; object = <NSWindow: 0x10055d970>}
>>> 4) Exit App
>>> Window will close <NSWindow: 0x10055d970> / <NSWindow: 0x10055d970>
>>> Open windows 1 (logged in windowWillClose:)
>>>
>>> Some questions:
>>>
>>> a) Why is it that I don't have 2 open windows in step 3)?
>>> b) What is the first window doing while the Versions browser is open? It
>>> seems the same document is opened again, judging by the NSWindow objects.
>>> c) What are the Errors reported just after entering Versions?
>>
>> The CG errors happen in all apps; seems to be a side-effect of however Apple
>> have implemented Versions.
>
> OK, good to know.
>
>>>
>>> Perhaps I'm not understanding how this stuff works yet, so any
>>> enlightenment would be gratefully received.
>>>
>>> As a side question, where are the different versions of the document kept?
>>> I've read that they are kept in the document, but inspection of the
>>> (XML-based) Core Data document shows that's not the case. The app is
>>> actually a manager of other (text) files on disk, and I'm amazed to see
>>> that the versions actually reflect the state of the managed text files,
>>> even though the save core data document does not store the file contents.
>>> The file contents are stored temporarily in a core data entity as a
>>> transient property. Can I then conclude that these transient properties are
>>> stored in the different versions? I've tried reading through the
>>> documentation on this, and I've watched the WWDC11 session on this, but
>>> perhaps I need to do that again.
>>
>> It's entirely private to the OS where and how it chooses to store the
>> historical versions of your documents.
>>
>
>
> True, but it would be very useful in the debugging/understanding process to
> be able to inspect the contents of the previous versions. Of course, if we
> had decent documentation on this, that might not be necessary. Alas....
>
> Martin
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Martin Hewitson
> Albert-Einstein-Institut
> Max-Planck-Institut fuer
> Gravitationsphysik und Universitaet Hannover
> Callinstr. 38, 30167 Hannover, Germany
> Tel: +49-511-762-17121, Fax: +49-511-762-5861
> E-Mail: [email protected]
> WWW: http://www.aei.mpg.de/~hewitson
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>
>
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