# withUnsafePointerToVImageBuffer(_:) Calls the given closure with an unsafe pointer to the underlying vImage buffer. ``` func withUnsafePointerToVImageBuffer(_ body: (UnsafePointer) throws -> R) rethrows -> R ``` ## Parameters `body` A closure with an unsafe pointer to a [`vImage_Buffer`](/documentation/Accelerate/vImage_Buffer) parameter that points to the underlying vImage buffer 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 passes a pixel buffer to the C API [`vImageBufferFill_ARGB8888(_:_:_:)`](/documentation/Accelerate/vImageBufferFill_ARGB8888(_:_:_:)) routine: ```swift let src = vImage.PixelBuffer(size: vImage.Size(width: 128, height: 128)) src.withUnsafePointerToVImageBuffer { vImageBufferPtr in _ = vImageBufferFill_ARGB8888(vImageBufferPtr, [0, 0, 0, 0], vImage_Flags(kvImageNoFlags)) } ``` --- 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)