officefileapi-devexpress-dot-pdf-ae5b8ef6.md
An electronic signature used to sign a PDF file.
Namespace : DevExpress.Pdf
Assembly : DevExpress.Pdf.v25.2.Core.dll
NuGet Package : DevExpress.Pdf.Core
public class PdfSignature :
PdfObject
Public Class PdfSignature
Inherits PdfObject
The following members return PdfSignature objects:
The PdfSignature class represents a signature with the CMS/PKCS #7 message and the specified certificate. The PdfDocumentProcessor uses the adbe.pkcs7.detached signature value encoding.
Pass PdfOrientedRectangle object as the constructor’s signatureBounds parameter to specify the signature’s bounds. You can also specify the rotation angle for the signature (in radians) when you create a PdfOrientedRectangle object. A positive angle rotates it counter-clockwise and a negative angle rotates it clockwise.
//...
X509Certificate2 certificate = new X509Certificate2(@"..\..\SignDemo.pfx", "dxdemo");
byte[] imageData = File.ReadAllBytes("..\\..\\Signature.png");
int pageNumber = 1;
int angleInDegrees = 45;
double angleInRadians = angleInDegrees * (Math.PI / 180);
PdfOrientedRectangle signatureBounds = new PdfOrientedRectangle(new PdfPoint(0, 460), 250, 90, angleInRadians);
PdfSignature signature = new PdfSignature(certificate, imageData, pageNumber, signatureBounds);
'...
Dim certificate As X509Certificate2 = New X509Certificate2("..\..\SignDemo.pfx", "dxdemo")
Dim imageData As Byte() = File.ReadAllBytes("..\..\Signature.png")
Dim pageNumber As Integer = 1
Dim angleInDegrees As Integer = 45
Dim angleInRadians As Double = angleInDegrees * (Math.PI / 180)
Dim signatureBounds As PdfOrientedRectangle = New PdfOrientedRectangle(New PdfPoint(0, 460), 250, 90, angleInRadians)
Dim signature As PdfSignature = New PdfSignature(certificate, imageData, pageNumber, signatureBounds)
The PdfSignature class properties allow you to specify the signature’s name, reason, location, contact information, and signing time.
Pass a PdfSaveOptions object as a parameter with a signature to the PdfDocumentProcessor.SaveDocument method to save a document with signing information.
Use the PdfSaveOptions.Signature property to access a PdfSignature object.
This example illustrates how to add a visual signature to a PDF document.
To accomplish this task, do the following:
Create a PDF Document API component represented by an instance of the PdfDocumentProcessor class.
Load a document from a file using the PdfDocumentProcessor.LoadDocument method.
Create a certificate using a certificate file name and a password to access the certificate.
Create a document visual signature using one of the PdfSignature constructor overloads that takes 4 arguments. For example, using a certificate, image data represented by a byte array, and specifying the page number and signature bounds. The signature bounds are represented by a PdfOrientedRectangle object. You can specify the rotation angle for the signature (in radians) when creating a PdfOrientedRectangle object.
Specify signing location, contact info and reason using the PdfSignature.Location, PdfSignature.ContactInfo and PdfSignature.Reason properties, respectively.
Save the signed document with signing information by calling the PdfDocumentProcessor.SaveDocument method.
using DevExpress.Pdf;
using System;
using System.IO;
using System.Security.Cryptography.X509Certificates;
namespace PDFSignature {
class Program {
static void Main(string[] args) {
// Create a PDF document processor.
using (PdfDocumentProcessor documentProcessor = new PdfDocumentProcessor()) {
// Load a PDF document.
documentProcessor.LoadDocument(@"..\..\Demo.pdf");
// Create a visual signature using certificate, image data, and specifying page number, signature bounds and rotation angle.
X509Certificate2 certificate = new X509Certificate2(@"..\..\SignDemo.pfx", "dxdemo");
byte[] imageData = File.ReadAllBytes("..\\..\\Signature.png");
int pageNumber = 1;
int angleInDegrees = 45;
double angleInRadians = angleInDegrees * (Math.PI / 180);
PdfOrientedRectangle signatureBounds = new PdfOrientedRectangle(new PdfPoint(620, 210), 250, 90, angleInRadians);
PdfSignature signature = new PdfSignature(certificate, imageData, pageNumber, signatureBounds);
// Specify signing location, contact info and reason.
signature.Location = "USA";
signature.ContactInfo = "[email protected]";
signature.Reason = "Approved";
// Save the signed document.
documentProcessor.SaveDocument(@"..\..\SignedDocument.pdf", new PdfSaveOptions() { Signature = signature });
}
}
}
}
Imports DevExpress.Pdf
Imports System
Imports System.IO
Imports System.Security.Cryptography.X509Certificates
Namespace PDFSignature
Class Program
Private Shared Sub Main(ByVal args As String())
Using documentProcessor As PdfDocumentProcessor = New PdfDocumentProcessor()
documentProcessor.LoadDocument("..\..\Demo.pdf")
Dim certificate As X509Certificate2 = New X509Certificate2("..\..\SignDemo.pfx", "dxdemo")
Dim imageData As Byte() = File.ReadAllBytes("..\..\Signature.png")
Dim pageNumber As Integer = 1
Dim angleInDegrees As Integer = 45
Dim angleInRadians As Double = angleInDegrees * (Math.PI / 180)
Dim signatureBounds As PdfOrientedRectangle = New PdfOrientedRectangle(New PdfPoint(620, 210), 250, 90, angleInRadians)
Dim signature As PdfSignature = New PdfSignature(certificate, imageData, pageNumber, signatureBounds)
signature.Location = "USA"
signature.ContactInfo = "[email protected]"
signature.Reason = "Approved"
documentProcessor.SaveDocument("..\..\SignedDocument.pdf", New PdfSaveOptions() With {
.Signature = signature
})
End Using
End Sub
End Class
End Namespace
Object DevExpress.Pdf.Native.PdfDocumentItem DevExpress.Pdf.Native.PdfObject PdfSignature
See Also