# CGPDFStreamCopyData(_:_:) Returns the data associated with a PDF stream. ``` func CGPDFStreamCopyData(_ stream: CGPDFStreamRef, _ format: UnsafeMutablePointer) -> CFData? ``` ## Parameters `stream` A PDF stream. `format` On return, contains a constant that specifies the format of the data returned—[`CGPDFDataFormat.raw`](/documentation/CoreGraphics/CGPDFDataFormat/raw), [`CGPDFDataFormat.jpegEncoded`](/documentation/CoreGraphics/CGPDFDataFormat/jpegEncoded), or [`CGPDFDataFormat.JPEG2000`](/documentation/CoreGraphics/CGPDFDataFormat/JPEG2000). ## Return Value A CFData object that contains a copy of the stream data. You are responsible for releasing this object. ## Discussion --- 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)