enqueueIORequest(with:completionHandler:)

Enqueues an input/output request on the stream.

Declaration

func enqueueIORequest(with data: NSMutableData?, completionHandler: (@Sendable (IOReturn, Int) -> Void)? = nil) throws

func enqueueIORequest(with data: NSMutableData?) async throws -> (IOReturn, Int)

Parameters

data:
An Nsmutabledata object defining the memory to use for the transfer.
completionHandler:
An Iousbhostcompletionhandler that runs when the request completes. The completionHandler doesn’t run if the method returns an error.

Discussion

important:

You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration:

func enqueueIORequest(with data: NSMutableData?) async throws -> (IOReturn, Int)

For information about concurrency and asynchronous code in Swift, see Calling Objective-C APIs Asynchronously.

This method sends an asynchronous request on the stream.