Oh I see. Have to use "pure" CFDictionary.
Well, it's all moot, since I can just story the object with the CALayer. Thanks
for that!
--
Rick
On Feb 1, 2010, at 00:49:23, Roland King wrote:
> As I said in my earlier mail, if I set up a CFDictionary() which is not copy
> for keys and retain for values, then I don't use tollfree bridging and use
> the NSMutableDictionary mutators because they don't work. (in my experience)
>
> I use CFDictionaryAddValue() instead.
>
> When checking for keys or iterating them, I will happily use the tollfree
> bridged methods however as I've not had the same problem with them.
>
> Rick Mann wrote:
>> On Feb 1, 2010, at 00:40:28, Jean-Daniel Dupas wrote:
>>> Don't bother with custom callback, CFType one works with any objects.
>> Well, that was the one I tried first, but it failed with the same error.
>>> Le 1 févr. 2010 à 09:32, Rick Mann a écrit :
>>>
>>>
>>>> I tried doing this:
>>>>
>>>> const void*
>>>> retainCallback(CFAllocatorRef inAlloc, const void* inValue)
>>>> {
>>>> NSObject* val = (NSObject*) inValue;
>>>> [val retain];
>>>> return val;
>>>> }
>>>> void
>>>> releaseCallback(CFAllocatorRef inAlloc, const void* inValue)
>>>> {
>>>> NSObject* val = (NSObject*) inValue;
>>>> [val release];
>>>> }
>>>>
>>>> CFDictionaryKeyCallBacks
>>>> sKeyCallbacks =
>>>> {
>>>> 0,
>>>> retainCallback,
>>>> releaseCallback,
>>>> NULL,
>>>> NULL,
>>>> NULL
>>>> };
>>>>
>>>> CFDictionaryValueCallBacks
>>>> sValCallbacks =
>>>> {
>>>> 0,
>>>> retainCallback,
>>>> releaseCallback,
>>>> NULL,
>>>> NULL,
>>>> NULL
>>>> };
>>>>
>>>> - (BOOL)
>>>> application: (UIApplication*) inApp
>>>> didFinishLaunchingWithOptions: (NSDictionary*) inOptions
>>>> { mFactoriesByLayer = (NSMutableDictionary*)
>>>> CFDictionaryCreateMutable(kCFAllocatorDefault,
>>>> 3,
>>>> &sKeyCallbacks,
>>>> &sValCallbacks);
>>>>
>>>> .
>>>> .
>>>> .
>>>>
>>>> [mFactoriesByLayer setObject: factory forKey: factory.layer];
>>>>
>>>> }
>>>>
>>>> But the setObject fails.
>>>>
>>>> However, since you say I can store arbitrary keys on the object, that's
>>>> the better way to go. I didn't realize one could do this.
>>>>
>>>> Thanks!
>>>>
>>>> On Feb 1, 2010, at 00:26:53, Roland King wrote:
>>>>
>>>>
>>>>> Tollfree Bridging is a little more complicated than that. They may end up
>>>>> being the same object under the covers, but even if they are, the
>>>>> NSDictionary version doesn't come with the range of options that the
>>>>> CFDictionary does. Just make a CFDictionary(), the default for it is to
>>>>> retain keys (and values) so it's actually really, really easy; I use them
>>>>> all over the place for stuff like this.
>>>>>
>>>>> If a have a non-NSDictionary compatible CFDictionary() like that by the
>>>>> way I use toll free bridging for reading values from it, but I don't use
>>>>> it for setting them, it doesn't seem to work.
>>>>>
>>>>> By the way, CALayer is a KVC compliant class so you can in fact just
>>>>> store a reference to an arbitrary object in it with
>>>>>
>>>>> [ layer setValue:value forKey:@"KeyForObjectAssociatedWithLayer" ];
>>>>>
>>>>> and save yourself a whole world of pain.
>>>>>
>>>>> Richard Penwell wrote:
>>>>>
>>>>>> I thought NSDictionary and CFDictionary were the same data object, that
>>>>>> whole toll free bridging...
>>>>>> An ugly hack would be to cast the pointer to a numeric type, and encode
>>>>>> that in a NSNumber... but I would feel very very ashamed of doing so.
>>>>>> On Feb 1, 2010, at 3:10 AM, Roland King wrote:
>>>>>>
>>>>>>> Because NSDictionary requires keys to be copyable because it copies
>>>>>>> them (it's in the documentation). Use a CFDictionary() instead, you can
>>>>>>> set it up to retain the keys and do what you want.
>>>>>>>
>>>>>>> Rick Mann wrote:
>>>>>>>
>>>>>>>
>>>>>>>> I'd like to use a CALayer object as a key in a dictionary. The reason
>>>>>>>> is that when my app detects a hit in a layer, I need to quickly
>>>>>>>> determine which object I've associated with it. Since I can't store a
>>>>>>>> reference to an arbitrary object in the CALayer, a dictionary seems to
>>>>>>>> be the most expedient way to do that.
>>>>>>>> Unfortunately, I can't seem to add my layer as the key (it fails with
>>>>>>>> "-[CALayer copyWithZone:]: unrecognized selector sent to instance
>>>>>>>> 0x50132a0"). It's really pretty handy to be able to use any object as
>>>>>>>> a key, why is this not the case in Obj-C?
>>>>>>>> TIA,
>>>>>>>> Rick
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>>>
>>> -- Jean-Daniel
>>>
>>>
>>>
>>>
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