THotPDF.BeginLoadedFormEditSession Method

function BeginLoadedFormEditSession: THPDFFormEditSession;

为至少包含一个表单字段的已加载文档返回一个会话

SetFieldValue 会记录历史、把字段标记为脏，并重新生成其外观流

Undo 和 Redo move through session history, Rollback restores every original value, and Commit retains the current values

BindEventAction 和 DispatchEvent support constrained focus, pointer, key, and commit actions without evaluating JavaScript

返回的会话归调用方所有，必须由调用方释放