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我正在尝试向现有 PDF 文件添加新文本，但没有添加。从下面的代码来看，它没有显示任何错误，但没有添加文本。

我还查看了下面的一些示例 Example1 Example2

如果有什么我做的不对，你能指导我吗？

这是用于将文本写入 pdf 的代码。

      else
        {
            if (document.State != DocumentState.Signed)
                document.State = DocumentState.Signed;

            document.ActionedUser = user;
            document.ActionDate = DateTime.Now;

      //this return bytes and it changes to document.SignedFileData = memoryStream.ToArray() and that makes it to loose original data
            document.SignedFileData = response.Document.SignedFileBytes;
            #region

            int numberOfPages;

            // create a MemoryStream to write the stamping result to
            using (MemoryStream memoryStream = new MemoryStream())
            {
                //create PdfReader object to read from the existing document
                using (PdfReader reader = new PdfReader(document.EditedFileData))
                // create a PdfStamper object to manipulate the PDF in the reader and write to the MemoryStream 
                using (PdfStamper stamper = new PdfStamper(reader, memoryStream))
                {
                    numberOfPages = reader.NumberOfPages;
                    reader.SelectPages("1-100");

                    // PdfContentByte from stamper to add content to the pages over the original content
                    PdfContentByte pbover = stamper.GetOverContent(numberOfPages);
                    iTextSharp.text.Font font = new iTextSharp.text.Font(null, 10, iTextSharp.text.Font.NORMAL, BaseColor.RED);

                    string FisrtName = "Testing";
                    string Position = "Testing";
                    string Signature = "Testing"; ;
                    string SignatureDate = DateTime.Now.ToString();

                    ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(FisrtName, font), 240, 715, 0);
                    ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(Position, font), 230, 628, 0);
                    ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(Signature, font), 230, 600, 0);
                    ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(SignatureDate, font), 230, 574, 0);
                }
            }

            #endregion
            // Store the manipulated PDF in the EditedFileData property
            document.SignedFileData = memoryStream.ToArray();


            Context.SaveChanges();
            return new SignatureSoapResponse() { Success = true, Message = document.Id.ToString() };
        }

PDF表格 在此处输入图像描述

4

1 回答 1

0

在评论过程中，事实证明被操纵的 PDF 将存储EditedFileData在PDFFile document.

OP 的代码使用奇怪的名称将结果 PDF 存储在文件系统中的某处：

new FileStream(Convert.ToBase64String(document.EditedFileData), FileMode.Create))

此目标流PdfStamper获取属性的当前内容，对其进行document.EditedFileDatabase64 编码，并将其用作写入 PDF 的文件系统中的文件名。

要将操作后的 PDF 存储在document.EditedFileData属性中，应改为使用 aMemoryStream作为目标流，PdfStamper并最终将内存流内容放入相关属性中，即：

// create a MemoryStream to write the stamping result to
using (MemoryStream memoryStream = new MemoryStream())
{
    //create PdfReader object to read from the existing document
    using (PdfReader reader = new PdfReader(document.OriginalFileData))
    // create a PdfStamper object to manipulate the PDF in the reader and write to the MemoryStream 
    using (PdfStamper stamper = new PdfStamper(reader, memoryStream))
    {
        numberOfPages = reader.NumberOfPages;
        reader.SelectPages("1-100");

        // PdfContentByte from stamper to add content to the pages over the original content
        PdfContentByte pbover = stamper.GetOverContent(numberOfPages);
        iTextSharp.text.Font font = new iTextSharp.text.Font(null, 16, iTextSharp.text.Font.BOLD, BaseColor.RED);

        string FisrtName = "Director1";
        string Position = "Director1";
        string Signature = "Director1";
        string SignatureDate = DateTime.Now.ToString();

        ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(FisrtName, font), 230, 650, 0);
        ColumnText.ShowTextAligned(pbover, Element.ALIGN_LEFT, new Phrase(Position, font), 230, 628, 0);
        ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(Signature, font), 230, 600, 0);
        ColumnText.ShowTextAligned(pbover, PdfContentByte.ALIGN_LEFT, new Phrase(SignatureDate, font), 230, 574, 0);
    }

    // Store the manipulated PDF in the EditedFileData property
    document.EditedFileData = memoryStream.ToArray();
}
于 2020-05-19T16:18:36.950 回答