Re: [Pyobjc-dev] Problems implementing a protocol

[Mani G. <ma...@tu...>]

On Mon, Feb 22, 2010 at 3:14 PM, Mani Ghasemlou <ma...@tu...> wrote:
> Hello,
>
> Here is an XCode project that reproduces the issue. Thank you.
>
> Mani
>
> On Fri, Feb 19, 2010 at 1:54 PM, Mani Ghasemlou <ma...@tu...> wrote:
>> Hello,
>>
>> This may or may not be a bridge bug, but either way I'll post it here
>> and hopefully someone will be able to help.
>>
>> I am implementing a Python class (note: not a subclass of NSObject)
>> that fulfills the ISyncSessionDriverDataSource protocol
>> (http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Reference/ISyncSessionDriverDataSource_Protocol/Reference/Reference.html).
>>
>> With this implementation passed in to the session driver, I've
>> confirmed that functions in my class returning various Cocoa objects
>> (NSDictionary, NSArray, NSURL) are being invoked and handled
>> correctly.
>>
>> However, I am stuck on the preferredSyncModeForEntityName_()
>> implementation. It is supposed to return type ISyncSessionDriverMode
>> (http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Reference/ISyncSessionDriverDataSource_Protocol/Reference/Reference.html#//apple_ref/doc/c_ref/ISyncSessionDriverMode),
>> an enum.
>>
>> My code simply returns an enum value:
>>
>>    def preferredSyncModeForEntityName_(self, entity):
>>        logging.debug('DRIVER requesting preferred sync mode')
>>        if self.refresh is True:
>>            logging.debug('returning ' + str(ISyncSessionDriverModeRefresh))
>>            return ISyncSessionDriverModeRefresh
>>        else:
>>            logging.debug('returning '+ str(ISyncSessionDriverModeFast))
>>            return ISyncSessionDriverModeFast
>>
>> From my understanding of both the documentation and the way PyObjC
>> works, the above should just work, right? However it doesnt:
>>
>> 2010-02-19 13:29:46,908 DEBUG
>> SyncDataSource.preferredSyncModeForEntityName_: DRIVER requesting
>> preferred sync mode
>> 2010-02-19 13:29:46,908 DEBUG
>> SyncDataSource.preferredSyncModeForEntityName_: returning 1
>> ISyncSessionDriverDataSource <SyncDataSource.SyncDataSource object at
>> 0x27ae070> responded poorly to preferredSyncModeForEntityName: with
>> entity com.apple.calendars.Attendee
>>
>> Any ideas what could be wrong here? I have tried all of the enum
>> values just to see if there's something wrong with my logic, but they
>> all return the same error. This leads me to think that
>> ISyncSessionDriver is not happy with the integer format used to return
>> this enum value. Or maybe I'm just missing something obvious?
>>
>> Any help greatly appreciated!
>>
>> (OS X 10.5.8, standard system PyObjC installation: 2.0)
>>
>> Regards,
>> Mani
>>

Just wanted to give this thread a bump. I am still blocked by this
issue, and any responses, workarounds, insights or otherwise would be
greatly appreciated!

To restate the problem, I am implementing an informal protocol
"ISyncSessionDriverDataSource". One of the methods to be implemented
simply returns an enum value (in other words, an int) -- and the Sync
Services framework complains no matter which of the acceptable enum
values I return. Either I'm missing something (it's happened before)
or there is a possible bug with with the bridge's SyncServices
framework support.

Apologies for bumping this with not much new to add, but I am very
keen to get this issue resolved. :)

Cheers,
Mani