PDF文檔通常是不能編輯的，但有些時候需要在PDF文檔中填寫日期或簽名之類，就需要在PDF有能編輯的文本域，本文介紹怎樣用C#來實現這一功能。
環境
工具：VS2015
語言：C#
操作PDF類庫：iTextSharp 5.5.10
生成的PDF預覽的工具：Skim、福昕閱讀器、Acrobat Reader
代碼實現
獲取文檔的頁數
PdfReader reader = new PdfReader(@"C:/WorkSpace/1.pdf");int count = reader.NumberOfPages;
創建文本域
TextField fieldDate = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(105, 100, 240, 125), "date");fieldDate.BackgroundColor= BaseColor.WHITE;fieldDate.BorderWidth= 1;fieldDate.BorderColor= BaseColor.BLACK;fieldDate.BorderStyle= 4;fieldDate.FontSize = 11f;
iTextSharp.text.Rectangle(105, 100, 240, 125) 用來設置文本域的位置，四個參數分別為：llx、lly、urx、ury：
llx 為Left ，lly 為Bottom,urx 為Right，ury 為Top
其中：Width=Right - Left Heigth = Top - Bototom
創建文本
Chunk cname = new Chunk("Date:", FontFactory.GetFont("Futura", 16f,new BaseColor(170,64,0)));Phrase pname = new Phrase(cname);PdfContentByte over = stamp.GetOverContent(count);ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, pname, 400, 420, 0);完整代碼
public static void AddTextField(){ PdfReader reader = new PdfReader(@"C:/WorkSpace/1.pdf"); FileStream out1 = new FileStream(@"C:/WorkSpace/2.pdf", FileMode.Create, FileAccess.Write); PdfStamper stamp = new PdfStamper(reader, out1); //獲得pdf總頁數 int count = reader.NumberOfPages; TextField fieldDate = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(105, 100, 240, 125), "date"); fieldDate.BackgroundColor = BaseColor.WHITE; fieldDate.BorderWidth = 1; fieldDate.BorderColor = BaseColor.BLACK; fieldDate.BorderStyle = 4; fieldDate.FontSize = 11f; TextField fieldSign = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(430, 100, 530, 125), "sign"); fieldSign.BackgroundColor = BaseColor.WHITE; fieldSign.BorderWidth = 1; fieldSign.BorderColor = BaseColor.BLACK; fieldSign.BorderStyle = 4; fieldSign.FontSize = 11f; Chunk cname = new Chunk("Date:", FontFactory.GetFont("Futura", 16f,new BaseColor(170,64,0))); Chunk ctitle = new Chunk("User Sign:", FontFactory.GetFont("Futura", 16f, new BaseColor(0, 128, 128))); Phrase pname = new Phrase(cname); Phrase ptitle = new Phrase(ctitle); //PdfContentBye類，用來設置圖像和文本的絕對位置 PdfContentByte over = stamp.GetOverContent(count); ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, pname, 400, 420, 0); ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, ptitle, 400, 350, 0); stamp.AddAnnotation(fieldDate.GetTextField(), count); stamp.AddAnnotation(fieldSign.GetTextField(), count); stamp.FormFlattening = true; stamp.Close();}新聞熱點
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