MetaText 属性

此 API 条目保留标识符、签名、代码块和 PDF 术语的原始形式。

返回文档的 XMP 元数据包，类型为宽字符串

返回文档的 XMP 元数据包，类型为宽字符串

Empty when the document has no /Metadata stream.

Wraps the corresponding PDFium API and exposes it as a TPdf instance member so consumers do not have to manage FPDF_DOCUMENT handles directly.

• Always check Pdf1.Active在调用页面作用域操作之前；需要打开文档的方法会引发EPdfError otherwise.
• 文档编辑方法（AddPage / DeletePage / UpdatePage / CreateAnnotation）会让内存中的文档处于脏状态，请记得调用SaveToFile to persist.
• Class methods (LoadLibrary / UnloadLibrary / GetRecommendedV8Flags) can be called without a TPdf instance.

Author, Title, Subject, Creator, Producer