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问题[itext7](coding)

Martin Hope
gchq
Asked: 2024-11-15 19:04:36 +0800 CST
  • 5

这是我用于合并 iTextSharp 中从数据库流式传输的 pdf 文档的功能

 Public Function PDF_Functions_AddPages(PDFByteContent As List(Of Byte())) As Byte()
 Try
    Using MS As New System.IO.MemoryStream
        Using vDoc As New iTextSharp.text.Document()
            Using vCopy As New PdfSmartCopy(vDoc, MS)
                vDoc.Open()
                For Each Row In PDFByteContent
                    Using vReader As New PdfReader(Row)
                        vCopy.AddDocument(vReader)
                    End Using
                Next
                vDoc.Close()
            End Using
        End Using
        Return MS.ToArray()
    End Using
Catch ex As Exception
    EmailError(ex)
    Return Nothing
End Try
End Function

但是我在弄清楚如何使用 iText7 做同样的事情时遇到了问题。

更新

我试过

 Function PDF_AddPages(PDFByteContent As List(Of Byte())) As Byte()
 Try
     Using MS As New System.IO.MemoryStream
         Using vWriter As New iText.Kernel.Pdf.PdfWriter(MS)
             Using vMerged As New iText.Kernel.Pdf.PdfDocument(vWriter)
                 Dim vMerger As New iText.Kernel.Utils.PdfMerger(vMerged)
                 For Each Row In PDFByteContent
                     Using copyFromMS As New MemoryStream(Row)
                         Using vReader As New iText.Kernel.Pdf.PdfReader(copyFromMS)
                             Using copyFromDoc As New iText.Kernel.Pdf.PdfDocument(vReader)
                                 vMerger.Merge(copyFromDoc, 1, copyFromDoc.GetNumberOfPages())
                             End Using
                         End Using
                     End Using
                 Next
             End Using

         End Using
         Return MS.ToArray()
     End Using
 Catch ex As Exception
     EmailError(ex, 2226, PageName)
     Return Nothing
 End Try
 End Function

但这会引发“充气城堡”错误

System.TypeInitializationException: The type initializer for 'iText.Bouncycastleconnector.BouncyCastleFactoryCreator' threw an exception. ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Logging.Abstractions, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
  at iText.Bouncycastleconnector.BouncyCastleFactoryCreator..cctor()

...也许更接近一点了:-)

itext7
Martin Hope
Beachdog
Asked: 2024-10-13 16:03:04 +0800 CST
  • 5

我正在尝试使用 iText7 和 c# 更改现有 PDF 文件中所有文本字段的字体。在所有示例中，我看到都会创建一个具有“源”和“目标文件”的 PdfDocument 对象。下面是我更改字体的代码。


string pdfFileSrc = @"C:\UnsecurePDF\3161_Dec2023.pdf";
string pdfFileDest = @"C:\UnsecurePDF\3161_Dec2023-3.pdf";                      
float fontSize = 8.00f; 
PdfFont fontTimesRoman = PdfFontFactory.CreateFont(iText.IO.Font.Constants.StandardFonts.TIMES_ROMAN);

 PdfDocument pdfDocument = new PdfDocument(new PdfReader(pdfFileSrc), new PdfWriter(pdfFileDest));
 PdfAcroForm acroForm = PdfAcroForm.GetAcroForm(pdfDocument, false); 
 var fields = acroForm.GetAllFormFields();

 foreach (var field in fields)
 {
     try
     {
         field.Value.SetFont(fontTimesRoman);
         field.Value.SetFontSize(fontSize);
     }
     catch (Exception ex)
     {
         Console.WriteLine(ex.Message);
     }

 }
 pdfDocument.Close();

我已成功通过代码更改了字体值，新值已保存在目标 PDF 文件中。我的问题是，有没有办法只修改现有 PDF 文件（源 PDF 文件），而无需创建额外的“目标”PDF 文件？

itext7