如何使用C#程序给PDF文件添加编辑域

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:\WorkSpace\1.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:\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();

}

dy("nrwz");

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