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I have a static callback function which is supposed to set an NSString and then call an updateLabelWithString: type function over in another file.
How do I get a reference to that file (my AppDelegate, if that helps) from within my static c++ function?
You have to have a reference to that object. You could set a static global and stash the reference into that, prior to your static method being called.
First though, I’d try to just use
[[UIApplication sharedApplication] delegate]. You can call Objective-C methods from static C functions. Not sure if this works from C++ though.