> On Tue, Oct 30, 2018 at 7:26 PM Carl Hoefs <newsli...@autonomy.caltech.edu> > wrote: > > Is it possible to create an NSData object from a dispatch_data_t? > > I'm interfacing to a 3rd party library that returns only a dispatch_data_t > object. Once upon a time you could simply cast that to (NSData *) and work > with it that way, but Xcode now flags it as an error: > > dispatch_data_t data_t = BGRequestSidebandDL(channel); > NSData *nsdata = data_t; // Incompatible pointer types initializing > 'NSData *' with an > expression > of type 'dispatch_data_t' (aka 'NSObject<OS_dispatch_data> *')
You may use a dispatch_data_t as if it were an NSData (assuming you're on iOS 7 or macOS 10.9 or later). But you do need to cast it explicitly: NSData *nsdata = (NSData *)data_t; > On Oct 30, 2018, at 7:37 PM, Ryan Dignard <conceptuallyfla...@gmail.com> > wrote: > > To get the size of the dispatch data you can call > dispatch_data_get_size(dispatch_data_t) on it which would let you create an > NSData object. This may be inefficient. dispatch_data_t often uses a discontiguous representation. Allocating an NSData this way is would need to copy the data. (Of course, if the code using it as an NSData goes on to call -bytes instead of -enumerateByteRangesUsingBlock: then it would be forced to copy into a contiguous representation anyway.) -- Greg Parker gpar...@apple.com <mailto: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