主题：[求助]如何给PDF文件添加水印

请教老师，我现在有一个表中有一个二进制列，用来存储pdf文件，现在想在这个PDF文件中添加三行水印，分别是：

mark pdf水印

 

Dim waterMarkName As String = "aaaaaabbbbcccc"
Dim reader As New iTextSharp.text.pdf.PdfReader("d:\test.pdf")

Dim msWater As new io.FileStream("d:\123.pdf", io.FileMode.Create)

Dim total  As Integer = reader.NumberOfPages
Dim pdfStamper As new iTextSharp.text.pdf.PdfStamper(Reader, msWater)

Dim psize = Reader.GetPageSize(1)
Dim width = psize.Width
Dim height = psize.Height
Dim gs As new iTextSharp.text.pdf.PdfGState
Dim basefont  As iTextSharp.text.pdf.BaseFont = iTextSharp.text.pdf.BaseFont.CreateFont("C:\WINDOWS\Fonts\SIMYOU.TTF", iTextSharp.text.pdf.BaseFont.IDENTITY_H, iTextSharp.text.pdf.BaseFont.NOT_EMBEDDED)
For i As Integer = 1 To total
   
    Dim waterContent = pdfStamper.GetOverContent(i)
    waterContent.SetGState(gs)
    waterContent.BeginText()
    waterContent.SetColorFill( iTextSharp.text.BaseColor.RED)
    waterContent.SetFontAndSize(basefont, 18)
    waterContent.SetTextMatrix(0, 0)
    waterContent.ShowTextAligned(iTextSharp.text.Element.ALIGN_CENTER, waterMarkName, width / 2, height / 2, 55)
    waterContent.EndText()
Next

pdfStamper.close
reader.Close()

2楼的代码，你要先引用dll   下载信息  [文件大小：1.3 MB  下载次数：5] 点击浏览该文件:itextsharp.zip

谢谢老师，只是代码没有注释，一时半会看不明白，不知道要如何修改才能完全嵌入到我的代码里面

另外，我需要添加的是三行水印，应该如何修改？

Dim waterMarkName As String = "报价单已作废!" & vbcrlf & " 作废日期: " & dr("作废日期")  & vbcrlf & "操作人: " & dr("作废人")

参考代码

 

 

Dim waterMarkName As String = "aaaaaabbbbcccc" & chr(13) & "123456" & chr(13) & "11111"
Dim reader As New iTextSharp.text.pdf.PdfReader("d:\test.pdf")

Dim msWater As new io.FileStream("d:\123.pdf", io.FileMode.Create)

Dim total  As Integer = reader.NumberOfPages
Dim pdfStamper As new iTextSharp.text.pdf.PdfStamper(Reader, msWater)

Dim psize = Reader.GetPageSize(1)
Dim width = psize.Width
Dim height = psize.Height
Dim gs As new iTextSharp.text.pdf.PdfGState
Dim basefont  As iTextSharp.text.pdf.BaseFont = iTextSharp.text.pdf.BaseFont.CreateFont("C:\WINDOWS\Fonts\SIMYOU.TTF", iTextSharp.text.pdf.BaseFont.IDENTITY_H, iTextSharp.text.pdf.BaseFont.NOT_EMBEDDED)
For i As Integer = 1 To total
    Dim waterContent = pdfStamper.GetOverContent(i) 'GetUnderContent(i)
    waterContent.SetGState(gs)
    waterContent.BeginText()
    waterContent.SetColorFill( iTextSharp.text.BaseColor.RED)
    waterContent.SetFontAndSize(basefont, 18)
    waterContent.SetTextMatrix(0, 0)
    Dim ary = waterMarkName.split(chr(13))
    For j As Integer = 0 To ary.length-1
        Dim s As String = ary(j)
        s = s.PadRight(20)
        waterContent.ShowTextAligned(iTextSharp.text.Element.ALIGN_left, s, (width-50)/2+j*20, height / 2-30*j, 45)
    Next
    waterContent.EndText()
Next

pdfStamper.close
reader.Close()

谢谢老师，幸苦了