# CTRunGetAdvancesPtr(_:) Returns a direct pointer for the glyph advance array stored in the run. ``` func CTRunGetAdvancesPtr(_ run: CTRun) -> UnsafePointer? ``` ## Parameters `run` The run whose advances you wish to access. ## Return Value A valid pointer to an array of `CGSize` structures representing the glyph advance array or `NULL`. ## Discussion The advance array will have a length equal to the value returned by [`CTRunGetGlyphCount(_:)`](/documentation/CoreText/CTRunGetGlyphCount(_:)). The caller should be prepared for this function to return `NULL` even if there are glyphs in the stream. Should this function return `NULL`, the caller needs allocate its own buffer and call [`CTRunGetAdvances(_:_:_:)`](/documentation/CoreText/CTRunGetAdvances(_:_:_:)) to fetch the advances. Note that advances alone are not sufficient for correctly positioning glyphs in a line, as a run may have a non-identity matrix or the initial glyph in a line may have a non-zero origin; callers should consider using positions instead. --- 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)