Question

我在vb.net中有一个sub：

Public Shared f_cb As BaseFont = BaseFont.CreateFont(Directory.GetCurrentDirectory() + "\plantillas\fonts\trebucbd.ttf", BaseFont.CP1252, BaseFont.NOT_EMBEDDED)
    Public Shared f_cn As BaseFont = BaseFont.CreateFont(Directory.GetCurrentDirectory() + "\plantillas\fonts\trebuc.ttf", BaseFont.CP1252, BaseFont.NOT_EMBEDDED)


Public Shared Sub GenPDF()
Try
   Using fs As System.IO.FileStream = New FileStream(Directory.GetCurrentDirectory() + "\te\TEST.pdf", FileMode.Create)
                Dim document As New Document(PageSize.A4, 25, 25, 30, 1)
                Dim writer As PdfWriter = PdfWriter.GetInstance(document, fs)
                document.AddTitle("test")
                document.Open()
                Dim cb As PdfContentByte = writer.DirectContent
                Dim png As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(Current.Server.MapPath("Images/logo.jpg"))
                png.ScaleAbsolute(75, 52)
                png.SetAbsolutePosition(40, 770)
                cb.AddImage(png)
                cb.BeginText()

                Dim left_margin As Integer = 40
                Dim top_margin As Integer = 750
                write(cb, "Streets S.R.L.", left_margin, top_margin, f_cb, 10)
                write(cb, "Av. 900, C.A.B.A. (1001), Peru", left_margin, top_margin - 12, f_cn, 8)
                write(cb, "Tel: 4300-2147 - Fax: 4300-2148", left_margin, top_margin - 24, f_cn, 8)
                write(cb, "C.U.I.T. 20-30602227-0", left_margin, top_margin - 36, f_cn, 10)
                write(cb, "I.V.A.", left_margin, top_margin - 48, f_cn, 10)
                cb.EndText()
                document.Close()
                writer.Close()
                fs.Close()
            End Using
        Catch ex As Exception
            Throw ex
        End Try
    End Sub

Public Shared Sub write(ByVal cb As PdfContentByte, ByVal Text As String, ByVal X As Integer, ByVal Y As Integer, ByVal font As BaseFont, ByVal Size As Integer)
        cb.SetFontAndSize(font, Size)
        cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, Text, X, Y, 0)
    End Sub

所以它工作正常，现在我想写一个已经创建的pdf，但我找不到模拟vb.net我正在尝试pdfStamper但没有成功，如何使用itextsharp将数据附加到pdf在vb.net中看起来像？

Answer 1

以下是将文本写入现有PDF文件，然后使用新名称保存的示例：

Dim oldFile As String = "SomePath/Existing.pdf"
Dim newFile As String = "SomePath/New.pdf"

' Create reader
Dim reader As New PdfReader(oldFile)
Dim size As Rectangle = reader.GetPageSizeWithRotation(1)
Dim document As New Document(size)

' Create the writer
Dim fs As New FileStream(newFile, FileMode.Create, FileAccess.Write)
Dim writer As PdfWriter = PdfWriter.GetInstance(document, fs)
document.Open()
Dim cb As PdfContentByte = writer.DirectContent

' Set the font, color and size properties for writing text to the PDF
Dim bf As BaseFont = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED)
cb.SetColorFill(BaseColor.DARK_GRAY)
cb.SetFontAndSize(bf, 8)

' Write text in the PDF
cb.BeginText()
Dim text As String = "Some text here"

' Set the alignment and coordinates here
cb.ShowTextAligned(1, text, 520, 640, 0)
cb.EndText()

' Put the text on a new page in the PDF 
Dim page As PdfImportedPage = writer.GetImportedPage(reader, 1)
cb.AddTemplate(page, 0, 0)

' Close the objects
document.Close()
fs.Close()
writer.Close()
reader.Close()

Answer 2

尽管该问题的原始答案很有帮助，但由于PdfSharp库的自然发展，它不再起作用。现在 PdfWriter 类成为了 friend （=不可访问），似乎作者希望推广使用 document 的高级功能。

对于那些使用上述方法但没有用的人-如果您只需要编辑pdf，并且足以以图形方式进行处理（无需搜索，等等），这就是方式（ vb.net ）：

Public Sub AppendText(SourcePath As String, TargetPath As String,
                           Text As String, someFont As Font,
                           left As Single, top As Single)
  Dim document As PdfDocument = IO.PdfReader.Open(SourcePath)
  Dim Page As PdfPage = document.Pages.Item(0)
  Dim GFX As XGraphics = XGraphics.FromPdfPage(Page)
  Dim someXFont As New XFont(someFont.FontFamily.Name, someFont.Size)
  GFX.DrawString(Text, someXFont, XBrushes.Red, New PointF(left, top))
  document.Save(TargetPath)
End Sub

我仍然在定位方面遇到问题，但是代码正在运行（12/2019）

使用vb.net中的itextsharp将文本写入pdf

2 个答案: