Rick, thanks for answering, because what I found on the Internet seems contradictory. Some say that if the C function is placed inside the implementation block, then it can access attributes as if it were a true Obj-C method; some say otherwise. So it’s a bit difficult to find a definitive answer thereon.
> Having said that, most callback APIs allow you to pass a context parameter > that gets passed back to your C callback. Often times, this context parameter > is a void* you pass in along with a pointer to your callback function. You > can pass "self" in this parameter when you register the callback, then cast > it inside your callback back to MyClass* (or whatever your class is). Yes, right; it’s a SQLite callback, the first parameter is a void *. I wanted to pass a pointer to a structure containing both a unique query id (out of uuid) and a pointer to self, but got told off by ARC because it apparently forbids to embed pointers to Obj-C objects in C-structs. So I just bridge-cast it to void *. Assuming the pointer to the struct is named ‘info’ and the field containing a reference to ‘self’ is called ‘this’, [info->this someMethod] as well as info->this->someAttribute are legal, aren’t they? Thanks a lot! Vincent _______________________________________________ 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
