THPDFHeadlessDocument.GetRenderAccess
function GetRenderAccess(PageIndex: Integer): THPDFHeadlessRenderAccess;Return read-only borrowed access to an existing zero-based page along with its inherited resources; see the lifetime and callback contract
The returned access also lends the current catalog and an optional-membership resolver that distinguishes unavailable group references from errors in live objects; the document must stay loaded and unchanged until rendering finishes
The returned Lifetime lease is permanently invalidated by graph mutation, reload, close or destruction; create a fresh optional-content viewer state after those operations