如何在现有pdf文件上添加水印

1 回答

• 1

  基本上，样本只是片段 . 您可以下载源代码，然后获得大量示例，包括此水印示例 .

  以下来自 PDFSharp-MigraDocFoundation-1_32/PDFsharp/samples/Samples C#/Based on GDI+/Watermark/Program.cs

  非常简单，真的...我只显示遍历每页的for循环的代码 . 你应该看一下完整的文件 .

  [...]
    const string watermark = "PDFsharp";
    const int emSize = 150;
  
    // Get a fresh copy of the sample PDF file
    const string filename = "Portable Document Format.pdf";
    File.Copy(Path.Combine("../../../../../PDFs/", filename),
      Path.Combine(Directory.GetCurrentDirectory(), filename), true);
  
    // Create the font for drawing the watermark
    XFont font = new XFont("Times New Roman", emSize, XFontStyle.BoldItalic);
  
    // Open an existing document for editing and loop through its pages
    PdfDocument document = PdfReader.Open(filename);
  
    // Set version to PDF 1.4 (Acrobat 5) because we use transparency.
    if (document.Version < 14)
      document.Version = 14;
  
    for (int idx = 0; idx < document.Pages.Count; idx++)
    {
      //if (idx == 1) break;
      PdfPage page = document.Pages[idx];
    [...]
  

  回复于 2024-04-28T13:28:36+08:00