Re: Windows, DLLs and NSBundle

[Michael Scheibler]

Yes, I know it should be invoked. But I inserted an NSLog statement
inside objc-load's objc_load_callback function: nothing. I also got the
notification, but the class name is nil (which of course can't have any
class name without this callback routine working).

Michael


Helge Hess wrote:
> 
> Hi,
> 
> If you use NSBundle you should even be able to get a NSBundleDidLoad
> Notification which includes the loaded classes and categories. At least
> this works with libFoundation (which overrides the callback during
> bundle loading) and MacOSX.
> 
> Helge
> 
> Adam Fedor wrote:
> >
> > Michael Scheibler wrote:
> > >
> > > Ok, I was (finally!) able to load a DLL using NSBundle. The ObjC-class
> > > inside this DLL is automatically initialized by its load-method. Now it
> > > would be nice to know what classes are inside.
> > > I found a callback function in objc-load.m (objc_load_callback) and
> > > found following lines in objc-api.h of gcc:
> > >
> > > /*
> > > ** This is a hook which is called by __objc_exec_class every time a
> > > class
> > > ** or a category is loaded into the runtime.  This may e.g. help a
> > > ** dynamic loader determine the classes that have been loaded when
> > > ** an object file is dynamically linked in.
> > > */
> > > extern void (*_objc_load_callback)(Class class, Category* category);
> > >
> > > Unfortunately this function is never invoked. Can you tell me why, or
> > > where I can change the code for it?
> > >
> > It should be invoked. objc_load_module should set _objc_load_callback to
> > the local function objc_load_callback. Anytime the Objective-C rurntime
> > loads a module containing classes, it should call this function for each
> > class and category. You might have to trace the program from
> > objc_load_module to make sure the callback is really getting setup
> > correctly.
> 
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