On Apr 8, 2013, at 3:07 PM, Caylan Larson <i...@caylan.net> wrote: > I'm doing an asynchronous read from a USB printer. The read works correctly. > My trouble is updating a NSTextField from within the callback.
I don’t know the USB API, but I’d guess the callback gets invoked on some background thread, in which case you cannot call AppKit code from it. Your callback should instead dispatch a block to the main thread’s dispatch queue. > &(_printerOutput) Don’t use &. It should just be _printerOutput, or perhaps (__bridge void*)_printerOutput. —Jens _______________________________________________ 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
