If @key is not found in @dictionary, %NULL is returned.
The @expected_type string specifies what type of value is expected.
If the value associated with @key has a different type then %NULL is
returned.
If the key is found and the value has the correct type, it is
returned. If @expected_type was specified then any non-%NULL return
value will have this type.
Looks up a value in a #GVariantDict.
If @key is not found in @dictionary, %NULL is returned.
The @expected_type string specifies what type of value is expected. If the value associated with @key has a different type then %NULL is returned.
If the key is found and the value has the correct type, it is returned. If @expected_type was specified then any non-%NULL return value will have this type.