# withConvertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:_:) Calls the given closure with a convert output archive stream. ``` static func withConvertStream(writingTo stream: ArchiveStream, insertKeySet: ArchiveHeader.FieldKeySet, removeKeySet: ArchiveHeader.FieldKeySet, selectUsing filter: ArchiveHeader.EntryFilter? = nil, flags: ArchiveFlags = [], threadCount: Int = 0, _ body: (ArchiveStream) throws -> E) throws -> E ``` ## Parameters `stream` The stream that receives the converted archive stream. `insertKeySet` A set of keys to fields that the operation inserts into the converted archive. `removeKeySet` A set of keys to fields that the operation removes from the converted archive. `filter` A closure that’s called for each entry that’s received by the stream. `flags` Flags that control the behavior of the operation. `threadCount` The number of worker threads that the operation uses, set to `0` for default. `body` A closure with the archive stream passed as a parameter. ## Return Value The result of the closure. ## Discussion This function opens a stream created by [`convertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:)`](/documentation/AppleArchive/ArchiveStream/convertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:)), calls the specified closure, and closes the stream. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)