> On Mar 4, 2016, at 2:24 PM, Jonathan Mitchell <li...@mugginsoft.com> wrote: > > Hi Alex > > Not sure if this will help at all as I am not 100% sure what you are doing. > In my case, using Mono, I needed to track events being raised in the Mono C > runtime back into Obj-C space. > You need some method of defining a call back function in the target C Api - > without that thinks would look rather bleak. > > Basically the C Mono runtime is configured to a call static C function in an > Obj C .m file in response to a C# managed event firing. > The static then calls a static method on an Obj-C class. > This Obj-C static uses collections to track registered events and invokes > performSelector: on a registered Obj-C target. > See here: > https://github.com/ThesaurusSoftware/Dubrovnik/blob/master/Framework/XCode/Representations/DBManagedEvent.m > > One of the arguments based in as part of the event callback is a pointer that > is used as a a key to retrieve the target NSObject. > This is complicated by the fact that the incoming pointer represents a > moveable memory location so there is some extra indirection too. > https://github.com/ThesaurusSoftware/Dubrovnik/blob/master/Framework/XCode/Representations/DBPrimaryInstanceCache.m > > This can get a bit complex but its all doable.
Block objects can help. clang supports block objects in plain C code (-fblocks, I think). Your Objective-C code can create a block object that performs the callback and pass it to the C code to store and call. The block object would capture the target NSObject so you don't need the dictionary of callback targets. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
