我有实际页面数据在90/180度范围内正确旋转,但页面方向不随其一起旋转.我刚刚开始使用iTextSharp,所以我对它的方法仍然有些不熟悉,但是能够使用StackOverflow的帖子拼凑到目前为止的内容.它很接近,但并不完全.

这是我到目前为止所拥有的：

' Get the input document and total number of pages
Dim inputPdf As New iTextSharp.text.pdf.PdfReader(fileName)
Dim pageCount As Integer = inputPdf.NumberOfPages

' Load the input document 
Dim inputDoc As New iTextSharp.text.Document(inputPdf.GetPageSizeWithRotation(1))

' Set up the file stream for our output document
Dim outFileName As String = Path.ChangeExtension(fileName,"pdf")
Using fs As New FileStream(outFileName,FileMode.Create)
    ' Create the output writer
    Dim outputWriter As iTextSharp.text.pdf.PdfWriter = iTextSharp.text.pdf.PdfWriter.GetInstance(inputDoc,fs)
    inputDoc.Open()

    ' Copy pages from input to output document
    Dim cb As iTextSharp.text.pdf.PdfContentByte = outputWriter.DirectContent
    For index As Integer = 1 To pageCount
        inputDoc.SetPageSize(inputPdf.GetPageSizeWithRotation(index))
        inputDoc.NewPage()

        ' If this is our page to be rotated,perform the desired transform
        ' TODO - 90 degree rotations need to change the page orientation as well
        Dim page As iTextSharp.text.pdf.PdfImportedPage = outputWriter.GetImportedPage(inputPdf,index)
        If index = pageNum Then
            Select Case angle
                Case 90
                    cb.AddTemplate(page,-1,1,page.Height)
                Case 180
                    cb.AddTemplate(page,page.Width,page.Height)
                Case 270
                    cb.AddTemplate(page,0)
                Case Else
                    ' Should not be here,but don't do anything
                    cb.AddTemplate(page,0)
            End Select
        Else
            ' No rotation; add as is
            cb.AddTemplate(page,0)
        End If
    Next
    inputDoc.Close()
End Using

我尝试将以下代码添加到顶部以从现有页面获取页面大小,并在旋转角度为90或270时交换尺寸：

For index As Integer = 1 To pageCount
Dim pageSize As iTextSharp.text.Rectangle = inputPdf.GetPageSizeWithRotation(index)
If angle = 90 OrElse angle = 270 Then
    ' For 90-degree rotations,change the orientation of the page,too
    pageSize = New iTextSharp.text.Rectangle(pageSize.Height,pageSize.Width)
End If
inputDoc.SetPageSize(pageSize)
inputDoc.NewPage()

不幸的是,这会产生将每页旋转90度的效果,并且我想要旋转的页面上的数据无论如何都没有显示在正确的位置(它向下移动了一些页面).

就像我说的,我并不熟悉API的内部工作原理.我已经在sourceforge页面上在线查看了这些示例,并查看了本书(两个版本),但我没有看到任何符合该法案的内容.我在这里看到一个示例,它显示了新组合PDF的页面方向,但没有显示现有PDF格式的页面方向.有人可以帮帮我吗？谢谢！