(Delphi ActiveX) PDF Signatures with Built-in SVG Graphics

See more PDF Signatures Examples

This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pdf: TChilkatPdf;
success: Integer;
json: TChilkatJsonObject;
cert: TChilkatCert;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

pdf := TChilkatPdf.Create(Self);

// Load a PDF to be signed.
// The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success := pdf.LoadFile('qa_data/pdf/hello.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

// Options for signing are specified in JSON.
json := TChilkatJsonObject.Create(Self);

// In most cases, the signingCertificateV2 and signingTime attributes are required.
json.UpdateInt('signingCertificateV2',1);
json.UpdateInt('signingTime',1);

// Specify the location/position, scale, and content of the signature's appearance.
json.UpdateInt('page',1);
json.UpdateString('appearance.y','top');
json.UpdateString('appearance.x','left');
json.UpdateString('appearance.fontScale','10.0');
json.UpdateString('appearance.text[0]','Digitally signed by: cert_cn');
json.UpdateString('appearance.text[1]','current_dt');
json.UpdateString('appearance.text[2]','The crazy brown fox jumps over the lazy dog.');

// In addition to the above, this example adds a built-in SVG graphic to the appearance.
// The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
// The full list of graphic names and images are shown below.
json.UpdateString('appearance.image','green-check-grey-circle');

// The graphic can be placed "left", "center", or "right".
// If "center", then the graphic is displayed behind the text.
json.UpdateString('appearance.imagePlacement','left');

// The graphic's opacity can range from 1 to 100.
// Centered graphics look best with less opacity (50 or less).
// In this example, we'll keep the opacity at 100.
json.UpdateString('appearance.imageOpacity','100');

// Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%


// Load the signing certificate. (Use your own certificate.)
cert := TChilkatCert.Create(Self);
success := cert.LoadPfxFile('qa_data/pfx/myPdfSigningCert.pfx','secret');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Tell the pdf object to use the certificate for signing.
success := pdf.SetSigningCert(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

success := pdf.SignPdf(json.ControlInterface,'qa_output/hello_signed.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('The PDF has been successfully cryptographically signed.');

// The appearance of the signature appears in Adobe Acrobat as shown here:



// The SVG icon graphics are embedded within the Chilkat library, 
// and were graciously provided by uxwing - Free SVG Icons 
// 
// The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

// Icons from uxwing.com are free (see https://uxwing.com/license/)
// 	- All icons on UXWing free to download, and use personal, commercial projects.
// 	- Attribution and Credit is NOT required, however, any credit will be much appreciated.
// 	- There is no limit to the number of times you can use.
// 	- You may modify the resources according to your requirements.

// The set of SVG names and the corresponding graphics are shown below.
// 
// For example, if we specify "green-check-green-circle"
json.UpdateString('appearance.image','green-check-green-circle');
// We get:


// "application-approved"


// "application-rejected"


// "document-accepted"


// "approved"


// "blue-check-mark"


// "green-check-mark"


// "green-check-grey-circle"


// "red-x-red-circle"


// "rejected"


// "result-failure"


// "result-pass"


// "signature"


// "document-check"


// "document-x"


// "red-x-grey-circle"

end;