Question

我使用ModelDoc创建了一个pdf文档。创建后，我使用PDFSharp在文档中插入数字签名。正确看到数字签名，我也能够执行签名验证的正常任务。但是，打印文档时不会打印数字签名。我已经尝试过使用＆＃34;文档和标记＆＃34;和＆＃34;文件和邮票＆＃34;。但是，签名仍未打印。这是数字签名的代码。 void ISignatureAppearanceHandler.DrawAppearance（XGraphics gfx，XRect rect） { string signtext =＆＃34;这是一个数字签名＆＃34 ;; XFont font = new XFont（＆＃34; Verdana＆＃34;，8.0，XFontStyle.Regular）; XPoint xPoint = new XPoint（0.0,0.0）; gfx.DrawRectangle（ XBrushes.LightBlue，xPoint.X， xPoint.Y，rect.Width，rect.Height ）; XTextFormatter xTextFormatter = new XTextFormatter（gfx）; xTextFormatter.DrawString（ signtext，字体，新的XSolidBrush（ XColor.FromKnownColor（XKnownColor.Black））新XRect（ xPoint.X，xPoint.Y，rect.Width，rect.Height ） XStringFormats.TopLeft ）; }

Answer 1

在启动PdfSignatureHandler之前尝试打印文本，对我来说效果很好。

 private static void SignExisting()
    {
        double height = 40;
        double width = 200;
        double x = 0;
        double y = 0;    
        PdfDocument pdfDocument = PdfReader.Open(path);
        PdfPage pp = pdfDocument.Pages[0];
        var cert = GetCertificate();
        string signtext = "Digitaly Signed by " + cert.GetNameInfo(X509NameType.SimpleName, false);           
       XGraphics gfx = XGraphics.FromPdfPage(pp);       
            XFont font = new XFont("Arial", 10, XFontStyle.Regular);
            gfx.DrawString(signtext, font, XBrushes.Black, new XRect(x, pp.Height - y, pp.Width, pp.Height), XStringFormats.TopLeft);
            gfx.DrawString("Date: " + DateTime.Now.ToString(), font, XBrushes.Black, new XRect(x, pp.Height - y, pp.Width, pp.Height), XStringFormats.TopLeft);  
        PdfSignatureOptions options = new PdfSignatureOptions
        {
            ContactInfo = cert.GetNameInfo(X509NameType.SimpleName, false),
            Location = cert.Subject,
            Reason = "",
            Rectangle = new XRect(x, y, width, height),
            AppearanceHandler = new SignAppearenceHandler()
        };
        PdfSignatureHandler pdfSignatureHandler = new PdfSignatureHandler(cert, null, options);
        pdfSignatureHandler.AttachToDocument(pdfDocument);
        Stream stream = new MemoryStream();
        pdfDocument.Save(stream);
    }

无法打印数字签名

1 个答案: