如何使用C#程序給PDF文件添加編輯域

更新時(shí)間：2017年01月06日 08:38:19 作者：馮威

本文主要給大家分享的是通過C#操作PDF類庫iTextSharp來實(shí)現(xiàn)在在PDF文檔中填寫日期或簽名之類的能編輯的文本域，非常的簡(jiǎn)單實(shí)用，有需要的小伙伴可以參考下。

PDF文檔通常是不能編輯的，但有些時(shí)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(shí)現(xiàn)這一功能。

環(huán)境

工具：VS2015

語言：C#

操作PDF類庫：iTextSharp 5.5.10

生成的PDF預(yù)覽的工具：Skim、福昕閱讀器、Acrobat Reader

代碼實(shí)現(xiàn)

獲取文檔的頁數(shù)

PdfReader reader = new PdfReader(@"C:\WorkSpace\1.pdf");
int count = reader.NumberOfPages;

創(chuàng)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(shè)置文本域的位置，四個(gè)參數(shù)分別為：llx、lly、urx、ury：

llx 為L(zhǎng)eft ，lly 為Bottom,urx 為Right，ury 為Top
其中：Width=Right - Left Heigth = Top - Bototom
創(chuàng)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(shù)
   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(shè)置圖像和文本的絕對(duì)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();
}

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