THotPDF.GetLoadedOCGVisibility Method
Queries the default visibility state of a specified optional content group (OCG) in the loaded PDF document
Declaration
function GetLoadedOCGVisibility(Index: Integer): boolean;Unit
HPDFDoc
Parameters
| Name | Purpose |
|---|---|
Index | Zero-based index of the optional content group |
Return value
若该 OCG 在文档默认配置（D 字典）中标记为可见（ON）则返回 True，否则返回 False
Usage notes
- OCG（Optional Content Group）对应 PDF 中的图层功能，此方法读取的是文档存储的默认状态，而非当前渲染器的状态
- 索引须在文档 OCG 数组的有效范围内，超出范围时返回
False - For documents containing multiple usage configurations (e.g., printing, exporting), the OCG visibility may differ between configurations; this method only reflects the default view configuration