无法从CFMutableDictionary中删除值 [英] Could not remove value from a CFMutableDictionary

问题描述

我试图使用CFDictionaryRemoveValue从字典中删除键值对. 但是它并没有删除键和值.它也删除了键和值对.

I was trying to remove a key value pair from the dictionary with CFDictionaryRemoveValue. But its not removing the keys and values.Its printng me the key-value pairs after removing too.

struct session *value = CFDictionaryGetValue(cfmdict,tiId); 
NSLog(@"The value is %d and %c", value->a, value->c); 
CFDictionaryRemoveValue(cfmdict,tiId); 
NSLog(@"The value is %d and %c", value->a, value->c);

输出

The value is 12 and L
The value is 12 and L

推荐答案

该值不再在字典中，而是在内存中，并且value仍指向该位置.试试:

The value is not in the dictionary anymore, but still in memory, and value still points there. Try:

struct session *value = (struct session *)CFDictionaryGetValue(cfmdict,tiId); 
NSLog(@"The value is %d and %c", value->a, value->c); 
CFDictionaryRemoveValue(cfmdict,tiId); 
value = (struct session *)CFDictionaryGetValue(cfmdict,tiId); 
NSLog(@"The value is %d and %c", value->a, value->c);

看看会发生什么.

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