---
title: "withConvertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:_:)"
framework: applearchive
role: symbol
role_heading: Type Method
path: "applearchive/archivestream/withconvertstream(writingto:insertkeyset:removekeyset:selectusing:flags:threadcount:_:)"
---

# withConvertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:_:)

Calls the given closure with a convert output archive stream.

## Declaration

```swift
static func withConvertStream<E>(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

Return Value The result of the closure.

## Discussion

Discussion This function opens a stream created by convertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:), calls the specified closure, and closes the stream.

## See Also

### Converting Data

- [convertStream(writingTo:insertKeySet:removeKeySet:selectUsing:flags:threadCount:)](applearchive/archivestream/convertstream(writingto:insertkeyset:removekeyset:selectusing:flags:threadcount:).md)