pdfViewer with picture signature

[Guang]

Hi

    Is there any plan for pdfViewer to load a signature with signature picture? 

    for now seems it supports only a single pfx, which is not quite enough.

[Martin]

Hi Guang,

You can achieve such functionality using the PdfProcessing`s API and especially a combination of Signing a Document and Inserting Image functionalities in the following manner:

// Define the certificate which will be used for the signing. 
X509Certificate2 certificate = new X509Certificate2(certificateFile, certificateFilePassword);

// The name of the signature must be unique. 
string signatureName = "SampleSignature";

// This is the Form XObject element that represents the contents of the signature field.  
Form form = new Form();
form.FormSource = new FormSource();
form.FormSource.Size = new Size(220, 220);

// We will use the editor to fill the Form XObject.  
FixedContentEditor formEditor = new FixedContentEditor(form.FormSource);
form.Position.Translate(10, 10);
using (Stream stream = File.OpenRead("signature.png"))
{
	formEditor.DrawImage(stream, new Size(181, 102));
}

// The Signature object is added to a signature field, so we can add a visualization to it.  
SignatureField signatureField = new SignatureField(signatureName);
signatureField.Signature = new Signature(certificate);

// The widget contains the Form XObject and defines the appearance of the signature field.  
SignatureWidget widget = signatureField.Widgets.AddWidget();
widget.Rect = new Rect(new Point(200, 600), new Size(100, 100));
widget.Border = new AnnotationBorder(10, AnnotationBorderStyle.Solid, null);
widget.Content.NormalContentSource = form.FormSource;
widget.RecalculateContent();

// The Widget class inherits from Annotation. And, as any other annotation, must be added to the respective collection of the page.  

RadFixedDocument document = this.pdfViewer.Document;
RadFixedPage lastPage = document.Pages.Last();
lastPage.Annotations.Add(widget);

FixedContentEditor editor = new FixedContentEditor(lastPage);
editor.Position.Translate(lastPage.Size.Width - 200, lastPage.Size.Height - 200);
editor.DrawForm(form.FormSource);
document.AcroForm.FormFields.Add(signatureField);
widget.RecalculateContent();
widget.AppearanceCharacteristics.Background = new Telerik.Windows.Documents.Fixed.Model.ColorSpaces.RgbColor(255, 0, 0);

I am attaching the sample project I created to test this functionality as well. Please, feel free to modify it in a way closer to your scenario.

I hope this solves your case.

Regards,
Martin
Progress Telerik