THPDFPage.AttachSignatureFieldAppearance Method
Provides attach signature field appearance behaviour for the digital signature and PAdES workflow. Use it when the surrounding API family needs explicit control over PDF objects, page content, resources, conformance, or diagnostics
Declaration
function AttachSignatureFieldAppearance(const FieldName: AnsiString): THPDFStreamObject;Unit
HPDFDoc
Parameters
| Name | Purpose |
|---|---|
FieldName | AcroForm field name or field dictionary targeted by the helper |
Return value
Returns a THPDFStreamObject value
Usage notes
- Use this API in the digital signature and PAdES workflow before the affected page, resource, field, or catalog object is finalised
- Keep object names, field names, resource names, and returned handles stable until the document is finalised
- Reserve signature space before inserting external CMS or timestamp bytes, and keep byte ranges stable after preparation
- Page-level changes affect subsequent operators on the same page; save and restore graphics state when a temporary setting should not leak