Adds new Stamp annotation on the current page.
type
THPDFStampAnnotationType = (satApproved, satExperimental, satNotApproved, satAsIs, satExpired,
satNotForPublicRelease, satConfidential, satFinal, satSold, satDepartmental,
satForComment, satTopSecret, satDraft, satForPublicRelease);
Delphi 語法：
procedure AddStampAnnotation ( Contents: AnsiString; Rectangle: TRect; StampType: THPDFStampAnnotationType; Color: TColor = clRed );
C++ 語法：
void __fastcall AddStampAnnotation ( AnsiString Contents, Windows::TRect &Rectangle, THPDFStampAnnotationType StampType, Graphics::TColor Color);
說明
使用 AddStampAnnotation 在目前頁面加入新的 Stamp annotation，並指定 text message（Contents）、rectangle area（Rectangle）、type（StampType）與 color
數值意義
satApproved Approved stamp
satExperimental Experimental stamp
satNotApproved NotApproved stamp
satAsIs AsIs stamp
satExpired Expired stamp
satNotForPublicRelease NotForPublicRelease stamp
satConfidential Confidential stamp
satFinal Final stamp
satSold Sold stamp
satDepartmental Departmental stamp
satForComment ForComment stamp
satTopSecret TopSecret stamp
satDraft Draft stamp
satForPublicRelease ForPublicRelease stamp
當文件要求每個註解都要有外觀時（PDF/A-2 或更新、PDF/X-6 或 PDF 2.0），印章會以 Color 畫出一個外框，並把大寫的印章名稱置中放在框內，高度取矩形高度的一半或更小以符合寬度。在 PDF/A 與 PDF/X 下不允許未內嵌的 Helvetica，名稱會以頁面目前的字型繪製，該字型會與頁面文字一起內嵌，所以新增印章前請先用 SetFont 選好字型
