Re: [Pyobjc-dev] void * fun

[Jonathan W. <jwi...@to...>]

On Jan 8, 2006, at 5:02 AM, Ronald Oussoren wrote:

>
> On 5-jan-2006, at 7:03, Jonathan Wight wrote:
>
>> I need to call an Objc method with a void * parameter:
>>
>> - (BOOL) addPluginsMenuTitle:(NSString*)menuTitle
>>           withSuperMenuTitle:(NSString*)superMenuTitle
>>                       target:(id)target
>>                       action:(SEL)selector
>>                keyEquivalent:(NSString*)keyEquivalent
>>    keyEquivalentModifierMask:(unsigned int)mask
>>                     userData:(void*)userData;
>>
>> I need to pass in data to the userData parameter, which will get  
>> passed to callback. Right now I dont care what the data is -  
>> strings or ints will work for me. But pyobjc refuses to let me  
>> pass in anything that isn't a "pointer". Is there a solution for  
>> this yet?
>
> In the Cocoa wrappers we replace the method signature by one that  
> passes an 'int' value for userData. You can then pass an integer to  
> the method and use that as a key to look up the actual data in a  
> dict. We do this because we cannot know how long the userdata  
> should stay alive, which means we cannnot perform the proper  
> reference counting for it and therefore cannot support real objects  
> without risking severe memory corruption.

I actually tried an int and couldn't get it working. Fortunately the  
application developer was able to work with me and add another api  
that takes id.

	Jon.