使用 C# 编码的程序更新 PDF 的注释 [英] Updating annotations of a PDF using a program coded in C#

问题描述

我能够使用 iTextSharp 提取 PDF 页面中的注释.但是，我无法编辑这些注释.我的要求是，我可以在多个注释中搜索特定注释，然后编辑其内容并保存 PDF.在打开 PDF 时，应显示更新的版本.但是，我尝试使用 itextsharp、spire 和 rasteredge，但没有一个给出任何有意义的结果.

I am able to extract annotations present in a PDF page using iTextSharp. However, I am not able to edit these annotations. My requirement is that among multiple annotations I can search a specific annotation and then edit its content and save the PDF. On the opening of the PDF, the updated version should be displayed. However, I tried using itextsharp, spire and rasteredge but non-of them give any meaningful result.

以下是使用 RasterEdge 制作的函数.

Below is the function made using RasterEdge.

static void RasterEdit(string PDF)
{
    PDFDocument doc = new PDFDocument(PDF);
    PDFPage page = (PDFPage)doc.GetPage(0);
    List<IPDFAnnot> annots = PDFAnnotHandler.GetAllAnnotations(doc);
    PDFAnnotHandler.DeleteAnnotation(doc, annots);
    doc.Save(PDF);
    int i = 0;
    Console.Write(" Location where you want to edit tag? ");
    string location = Console.ReadLine();
    location = location.ToUpper();

    Console.Write("New Employee Name: ");
    string emp = Console.ReadLine();
    foreach (IPDFAnnot annot in annots)
    {
        i++;
        if (annot is PDFAnnotStickyNote)
        {
            string []txt;
            txt=annot.Content.Split(':');

            /*

             */
            if (txt[0]==location)
            {
                annot.Content = location + ":" + emp; 
            }
        }
       // Console.WriteLine(i+" "+annot.Content);
    }
    PDFAnnotHandler.AddAnnotation(PDF, annots);
}

尖顶:

static void spireEditTag(string PDF)
{

    //Initialize an instance of PdfDocument class and load the file 
    Spire.Pdf.PdfDocument pdf = new Spire.Pdf.PdfDocument();
    pdf.LoadFromFile(PDF);

    string newfile = System.IO.Path.GetDirectoryName(PDF) + @"\NewPDF.pdf";
    //pdf.SaveToFile(newfile);
    //System.Diagnostics.Process.Start(newfile);

    //PdfPageBase page = pdf.Pages[0];

    //Get the first annotation in the first page 

    Spire.Pdf.Annotations.PdfAnnotation annotation = pdf.Pages[0].AnnotationsWidget[0];

    Console.Write("New Employee: ");
    string emp = Console.ReadLine();
    //Add the modified text and set the formatting 
    annotation.Text = emp;
    //annotation.Color = new PdfRGBColor(Color.Red);
    //annotation.Border = new PdfAnnotationBorder(1f);

    pdf.Pages[0].AnnotationsWidget[0].Text = emp;

    //pdfDocumentViewer1.SaveToFile(fileName);

    //Save the file and view 
    pdf.SaveToFile(PDF,FileFormat.PDF);

    pdf.Close();
    //System.Diagnostics.Process.Start(PDF);

} 

iTextSharp:

iTextSharp:

static void ReadTagPDF(string PDF)
{
    PdfReader reader = new PdfReader(PDF);
    for(int i=1; i<=reader.NumberofPages; i++)
    {
        PdfArray array = reader.GetPageN(i).GetAsArray(PdfName.ANNOTS);
        if(array==null) continue;
        for( int j=0; j<array.Size; j++)
        {
            PdfDictionary annot = array.GetAsDict(j);
            PdfString text = annot.GetAsString(PdfName.CONTENTS);

            StringBuilder sb = new StringBuilder();

            if(Convert.ToString(text).Trim()=="1F-MTR-7")
            {
                annot.Put(PdfName.CONTENTS, new PdfString("Test");
                reader.AddPdfObject(annot);
            }
        }
    }
      reader.Close();
}

运行这些函数时没有出现任何错误，PDF 的注释也没有变化.如果有人能对此提供帮助，那就太好了.

I do not get any error when I run these functions but as well as no change in the annotations of the PDF. If anybody can help out on this, it would be great.

推荐答案

截至目前，我一直无法找到更新或编辑实际 PDF 注释的方法.但是，我正在利用 RasterEdge 库删除现有注释并将其替换为新内容.这很有效，因为它不需要像我想象的那么多时间.那就是程序用这个逻辑也足够快了.

As of now I haven't been able to find anyway to update or edit the actual PDF Annotation. However, I am utilizing RasterEdge Library to delete the existing annotation and replace it with new content. This works efficiently as it's not taking as much time as I thought. That is the program is quick enough with this logic too.

 using RasterEdge.XDoc.PDF;
 static void EditTag(string PDF) 
    {       

        PDFDocument doc = new PDFDocument(PDF);
        List<IPDFAnnot> annots = PDFAnnotHandler.GetAllAnnotations(doc);
        foreach (IPDFAnnot annot in annots)
        {
            if (annot is PDFAnnotTextBox)
            {
                PDFAnnotTextBox obj = (PDFAnnotTextBox)annot;
                if (obj.Content.Trim() == "Content to be searched and replaced")
                {
                    //  get the 1st page
                    PDFPage page = (PDFPage)doc.GetPage(0);

                    //  create the annotation
                    PDFAnnotTextBox test = new PDFAnnotTextBox();

                    //Copy Properties of Original Annotation
                    test.Boundary = obj.Boundary;
                    test.LineColor = obj.LineColor;
                    test.LineStyle = obj.LineStyle;
                    test.LineWidth = obj.LineWidth;
                    test.Opacity = obj.Opacity;
                    test.TextColor = obj.TextColor;
                    test.TextFont = obj.TextFont;
                    test.FillColor = Color.Yellow;
                    test.TextFont = new System.Drawing.Font(test.TextFont.FontFamily, 6);

                    //Changing the Required Subject and Content of Annotation
                    test.Content = obj.Content + "appending content";

                    Console.WriteLine("Deleting Existing Annotation.");
                    PDFAnnotHandler.DeleteAnnotation(doc, obj);
                    Console.WriteLine("Deleted.");
                    Console.WriteLine("Adding new Annotation.");
                    PDFAnnotHandler.AddAnnotation(page, test);
                    Console.WriteLine("New Annotation added.");

                    //  save the PDF
                    doc.Save(PDF);
                }
            }
        }
    }

这篇关于使用 C# 编码的程序更新 PDF 的注释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！