CODEWITHSUNDEEP
objective-cxcodeios4castingnsdictionary
johnluttig
johnluttig

Reputation: 740

Casting a CFDictionaryRef to NSDictionary?

I have the code (stripped down):

CFDictionaryRef *currentListingRef;
//declare currentListingRef here
NSDictionary *currentListing;
currentListing = (NSDictionary *) currentListingRef;

And then I get the error:

Cast of a non-Objective-C pointer type 'CFDictionaryRef *' (aka 'const struct __CFDictionary **') to 'NSDictionary *' is disallowed with ARC

What am I doing wrong? How do I convert from a CFDictionaryRef to an NSDictionary?

Upvotes: 43

Views: 29387

Answers (3)

MSA
MSA

Reputation: 134

Try this code,

NSDictionary *ssidList = (__bridge NSDictionary*)myDict;
NSString *SSID = [ssidList valueForKey:@"SSID"];

Upvotes: -1

Laimonas
Laimonas

Reputation: 6001

In ARC, this should be done this way:

CFDictionaryRef currentListingRef = ...;
NSDictionary *currentListing = CFBridgingRelease(currentListingRef);

This releases the CF object and transfers ownership of the object to ARC otherwise you should release CF object manually.

Upvotes: 8

Joshua Weinberg
Joshua Weinberg

Reputation: 28688

ARC changed the way bridging works.

NSDictionary *original = [NSDictionary dictionaryWithObject:@"World" forKey:@"Hello"];
CFDictionaryRef dict = (__bridge CFDictionaryRef)original;
NSDictionary *andBack = (__bridge NSDictionary*)dict;
NSLog(@"%@", andBack);

Upvotes: 81

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