# withUnsafeVImageBuffers(_:) Calls the given closure with the underlying vImage buffers. ``` func withUnsafeVImageBuffers(_ body: ([vImage_Buffer]) throws -> R) rethrows -> R ``` ## Parameters `body` A closure with a [`vImage_Buffer`](/documentation/Accelerate/vImage_Buffer) parameter that points to the underlying vImage buffers of the pixel buffer. ## Return Value The return value, if any, of the body closure parameter. ## Discussion Use this function to incorporate pixel buffer based image processing code with existing vImage code. For example, the following code accesses each multiple-plane pixel buffer’s underlying vImage buffers’ `rowBytes` property: ```swift let src = vImage.PixelBuffer(size: vImage.Size(width: 32, height: 64)) src.withUnsafeVImageBuffers { vImageBuffers in for buffer in vImageBuffers { print(buffer.rowBytes) } } ``` --- 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)