---
title: captureStreams()
framework: foundation
role: symbol
role_heading: Instance Method
path: foundation/urlsessionstreamtask/capturestreams()
---

# captureStreams()

Completes any already enqueued reads and writes, and then invokes the urlSession(_:streamTask:didBecome:outputStream:) delegate message.

## Declaration

```swift
func captureStreams()
```