pub type SecMessageBlock = *mut DynBlock<dyn Fn(*const CFType, *mut CFError, u8)>;Available on crate features
SecTransform and block2 only.Expand description
A SecMessageBlock is used by a transform instance to deliver messages during asynchronous operations.
Parameter message: A CFType containing the message. This is where
either intermediate or final results are returned.
Parameter error: If an error occurred, this will contain a CFErrorRef,
otherwise this will be NULL. If not NULL the caller
is responsible for releasing the CFErrorRef.
Parameter isFinal: If set the message returned is the final result
otherwise it is an intermediate result.
See also Apple’s documentation