如何使用C#程序给PDF文件添加编辑域

2019-10-29 21:16:03

字体：大中小

来源：转载

供稿：网友

PDF文档通常是不能编辑的，但有些时候需要在PDF文档中填写日期或签名之类，就需要在PDF有能编辑的文本域，本文介绍怎样用 C#来实现这一功能。

环境

工具：VS2015

语言：C#

操作PDF类库：iTextSharp 5.5.10

生成的PDF预览的工具：Skim、福昕阅读器、Acrobat Reader

代码实现

获取文档的页数

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

创建文本域

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) 用来设置文本域的位置，四个参数分别为：llx、lly、urx、ury：

llx 为Left ，lly 为Bottom,urx 为Right，ury 为Top
其中：Width=Right - Left Heigth = Top - Bototom
创建文本

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);

完整代码

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);      //获得pdf总页数   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类，用来设置图像和文本的绝对位置   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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