如何使用iTextSharp将表添加到现有pdf [英] How do I add table to existing pdf using iTextSharp

问题描述

我正在开发一个应用程序，使用itextsharp将pdf文档合并到一个文档中。我已经创建了单个pdf。

I'm developing an app to merging pdf documents into one document using itextsharp. I've gotten the single pdf created.

现在我必须创建一个表并将其添加到第一页。

Now I have to create a table and add it to the first page.

不幸的是，它变得比接缝更复杂。经过几个小时的尝试，我可以将表格添加到第二页。

Unfortunately this is becoming more complicated than it seams. After hours of trying I was able to add the table into the second page.

如何将表格添加到第一页？

How can I add the table to the first page?

我正在使用此示例项目进行测试 http://gamepacks.org/Sample.zip 。

I'm using this sample project for testing http://gamepacks.org/Sample.zip.

Public Sub MergePdfFiles(ByVal docList As List(Of String), ByVal outputPath As String)

    Try
        '
        ' http://www.vbforums.com/showthread.php?475920-Merge-Pdf-Files-and-Add-Bookmarks-to-It-(Using-iTextSharp)
        '
        If docList.Count = 0 Then Exit Sub

        Dim OutlineList As List(Of PdfOutline) = New List(Of PdfOutline)
        Dim FirstPageIndex As Integer = 1           ' Tracks which page to link the bookmark

        Dim result As Boolean = False
        Dim pdfCount As Integer = 0             'total input pdf file count

        Dim fileName As String = String.Empty           'current input pdf filename

        Dim reader As iTextSharp.text.pdf.PdfReader = Nothing
        Dim pageCount As Integer = 0                'current input pdf page count
        Dim doc As iTextSharp.text.Document = Nothing       'the output pdf document
        Dim writer As PdfWriter = Nothing
        Dim cb As PdfContentByte = Nothing

        'Declare a variable to hold the imported pages
        Dim page As PdfImportedPage = Nothing
        Dim rotation As Integer = 0

        'Now loop thru the input pdfs
        For Each row As String In docList
            reader = New iTextSharp.text.pdf.PdfReader(row)

            ' Is this the first pdf file
            If (row = docList(0)) Then
                doc = New iTextSharp.text.Document(reader.GetPageSizeWithRotation(1), 18, 18, 18, 18)
                writer = PdfWriter.GetInstance(doc, New IO.FileStream(outputPath, IO.FileMode.Create))
                doc.Open()
                ' Always show the bookmarks
                writer.ViewerPreferences = PdfWriter.PageModeUseOutlines

                'Instantiate a PdfContentByte object
                cb = writer.DirectContentUnder
            End If

            For i As Integer = 1 To reader.NumberOfPages
                'Get the input page size
                doc.SetPageSize(reader.GetPageSizeWithRotation(i))

                'Create a new page on the output document
                doc.NewPage()

                'Now we get the imported page
                page = writer.GetImportedPage(reader, i)

                'Read the imported page's rotation
                rotation = reader.GetPageRotation(i)

                'Then add the imported page to the PdfContentByte object as a template based on the page's rotation
                If rotation = 90 Then
                    cb.AddTemplate(page, 0, -1.0F, 1.0F, 0, 0, reader.GetPageSizeWithRotation(i).Height)
                ElseIf rotation = 270 Then
                    cb.AddTemplate(page, 0, 1.0F, -1.0F, 0, reader.GetPageSizeWithRotation(i).Width + 60, -30)
                Else
                    cb.AddTemplate(page, 1.0F, 0, 0, 1.0F, 0, 0)
                End If
            Next
        Next


        ' NEED TO ADD THIS TO THE FIRST PAGE
        doc.Add(_stateTable)




        doc.Close()
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try

End Sub




Private Function _stateTable() As PdfPTable
    Dim col As String() = {"No.", "Name", "City"}
    Dim table As New PdfPTable(3)

    table.WidthPercentage = 75
    table.SetWidths(New [Single]() {1, 5, 4})
    table.SpacingBefore = 10

    For i As Integer = 0 To col.Length - 1
        Dim cell As New PdfPCell(New Phrase(col(i)))
        cell.BackgroundColor = New BaseColor(204, 204, 204)
        table.AddCell(cell)
    Next

    table.AddCell("32")
    table.AddCell("Jack")
    table.AddCell("Sgeg")
    table.AddCell("33")
    table.AddCell("Mike")
    table.AddCell("Twin")

    Return table
End Function

推荐答案

我不知道你在哪里找到了编写代码的灵感，但我很遗憾地说你读错了文件。使用 PdfWriter / PdfImportedPage 复制文档时，您将丢弃原始文档中存在的所有交互性。使用 PdfStamper 操作现有页面，如本书第6章所述。见表6.1： http://www.manning.com/lowagie2/samplechapter6.pdf

I don't know where you found the inspiration for writing your code, but I'm sorry to say that you've read the wrong documentation. When you copy a document using PdfWriter/PdfImportedPage, you're throwing away all interactivity that exists in the original document. Manipulating an existing page is done with PdfStamper as described in chapter 6 of my book. See table 6.1: http://www.manning.com/lowagie2/samplechapter6.pdf

如果要在第一页上标记内容，则需要使用 stamper.GetOverContent（1）。例如，请参阅此 StampText 示例。使用WriteSelectedRows方法添加表格，例如参见 PdfCalendar 示例。

If you want to stamp content on the first page, you need to use stamper.GetOverContent(1). See for instance this StampText example. Adding a table should be done with the WriteSelectedRows method, see for instance the PdfCalendar example.

请注意，您需要定义表格的坐标。还要了解PDF不是Word处理格式。该表将与您指定的坐标处已存在的任何内容重叠（因为这是PDF的工作方式：所有内容都在绝对位置定义）。

Note that you need to define the coordinates of the table. Also understand that PDF is NOT a Word processing format. The table will overlap with any content that already exists at the coordinates you specified (because that's the way PDF works: all content is defined at absolute positions).

这篇关于如何使用iTextSharp将表添加到现有pdf的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！