Hi,

I'm trying to make some of Apple's C Libraries usable from java using JNA. So far it's going quite well, but there's one thing I can't find a solution for.

There are "constants" described in the header files, that I don't know how to get access to, as their value is defined in the library itself. E.g. I understand how I can define the following struct and callbacks with JNA, but I don't know how to get access to the value of "kCFTypeDictionaryKeyCallBacks" and "kCFCopyStringDictionaryKeyCallBacks":

typedef const void * (*CFDictionaryRetainCallBack)(CFAllocatorRef allocator, const void *value); typedef void (*CFDictionaryReleaseCallBack)(CFAllocatorRef allocator, const void *value); typedef CFStringRef (*CFDictionaryCopyDescriptionCallBack)(const void *value); typedef Boolean (*CFDictionaryEqualCallBack)(const void *value1, const void *value2); typedef CFHashCode (*CFDictionaryHashCallBack)(const void *value); typedef struct { CFIndex version; CFDictionaryRetainCallBack retain; CFDictionaryReleaseCallBack release; CFDictionaryCopyDescriptionCallBack copyDescription; CFDictionaryEqualCallBack equal; CFDictionaryHashCallBack hash; } CFDictionaryKeyCallBacks;

/*! @constant kCFTypeDictionaryKeyCallBacks Predefined CFDictionaryKeyCallBacks structure containing a set of callbacks appropriate for use when the keys of a CFDictionary are all CFTypes. */ CF_EXPORT const CFDictionaryKeyCallBacks kCFTypeDictionaryKeyCallBacks;

/*! @constant kCFCopyStringDictionaryKeyCallBacks Predefined CFDictionaryKeyCallBacks structure containing a set of callbacks appropriate for use when the keys of a CFDictionary are all CFStrings, which may be mutable and need to be copied in order to serve as constant keys for the values in the dictionary. */ CF_EXPORT const CFDictionaryKeyCallBacks kCFCopyStringDictionaryKeyCallBacks;

I'm not a big C expert, so please forgive me, if I miss something obvious...

Thanks for your help,

Timo