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
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PdfReader reader = new PdfReader(@"C:WorkSpace1.pdf");int count = reader.NumberOfPages; |
创建文本域
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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
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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
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public static void AddTextField(){ PdfReader reader = new PdfReader(@"C:WorkSpace1.pdf"); FileStream out1 = new FileStream(@"C:WorkSpace2.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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