Function

CFDictionaryContainsKey

Returns a Boolean value that indicates whether a given key is in a dictionary.

Declaration

Boolean CFDictionaryContainsKey(CFDictionaryRef theDict, const void *key);

Parameters

theDict

The dictionary to examine.

key

The key for which to find matches in theDict. The key hash and equal callbacks provided when the dictionary was created, are used to compare. If the hash callback is NULL, key is treated as a pointer and converted to an integer. If the equal callback is NULL, pointer equality (in C, ==) is used. If key, or any of the keys in the dictionary, is not understood by the equal callback, the behavior is undefined.

Return Value

true if key is in the dictionary, otherwise false.

See Also

Examining a dictionary

CFDictionaryContainsValue

Returns a Boolean value that indicates whether a given value is in a dictionary.

CFDictionaryGetCount

Returns the number of key-value pairs in a dictionary.

CFDictionaryGetCountOfKey

Returns the number of times a key occurs in a dictionary.

CFDictionaryGetCountOfValue

Counts the number of times a given value occurs in the dictionary.

CFDictionaryGetKeysAndValues

Fills two buffers with the keys and values from a dictionary.

CFDictionaryGetValue

Returns the value associated with a given key.

CFDictionaryGetValueIfPresent

Returns a Boolean value that indicates whether a given value for a given key is in a dictionary, and returns that value indirectly if it exists.