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;
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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;
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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);
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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();
}
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