iTextSharp 签名图像未显示在 PDF 签名字段中

Question

我在一天中的大部分时间都在研究这个问题。我有一个使用 iTextSharp 签署 PDF 文档的现有应用程序。数字签名存在并且文本表示形式显示在 PDF 的签名字段中，但签名的图像不显示。

以下是有问题的代码。感谢您提供的任何帮助/建议。

if (signatureBitmap != null)
{
    if (reader == null) reader = new PdfReader(PDFByteArray);

    pdfStamper = PdfStamper.CreateSignature(reader, outputStream, PDFVersion, null, true);

    PdfSignatureAppearance signatureAppearance = pdfStamper.SignatureAppearance;

    //Add digital certificate to field
    signatureAppearance.SetCrypto(Key, Certificate, null, PdfSignatureAppearance.SELF_SIGNED);
    signatureAppearance.Reason = Reason;
    signatureAppearance.Location = Location;

    signatureAppearance.Render = PdfSignatureAppearance.SignatureRender.GraphicAndDescription;

    if (signatureBitmap != null)
    {
        iTextSharp.text.Image signatureFieldImage = iTextSharp.text.Image.GetInstance(signatureBitmap, System.Drawing.Imaging.ImageFormat.Bmp);
        signatureAppearance.SignatureGraphic = signatureFieldImage;
    }

    signatureAppearance.Acro6Layers = acroLayer;
    signatureAppearance.SetVisibleSignature(acrobatSignatureFieldName);
    pdfStamper.Close();
    reader.Close();
    reader = null;

}

Answer 1

你需要关于你签名的位置，试试这个：

Rectangle rSignature= new Rectangle(100,100);
signatureAppearance.setVisibleSignature(rSignature, 1, "a name");