Returns a pointer to a mutable byte buffer of a CFMutableData object.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
A CFMutableData object. If you pass an immutable CFData object, the behavior is not defined.
A pointer to the bytes associated with
If the length of
the’s data is not zero, this function is guaranteed to return a pointer to a CFMutableData object's internal bytes. If the length of
the’s data is zero, this function may or may not return
NULL dependent upon many factors related to how the object was created (moreover, in this case the function result might change between different releases and on different platforms).