将一个CFDictionaryRef转换为NSDictionary？ [英] Casting a CFDictionaryRef to NSDictionary?

问题描述

我有代码（剥离）：

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

然后我得到错误：

使用ARC不允许使用非目标C指针类型'CFDictionaryRef *'（aka'const
struct __CFDictionary **'）到'NSDictionary *'的转型

我做错了什么？如何将 CFDictionaryRef 转换为 NSDictionary ？

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

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?

解决方案

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);

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