Delphi DLL

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.

Delphi DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
cert: HCkCert;

begin
success := False;

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

pdf := CkPdf_Create();

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

//  Options for signing are specified in JSON.
json := CkJsonObject_Create();

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

//  Specify the location/position, scale, and content of the signature's appearance.
CkJsonObject_UpdateInt(json,'page',1);
CkJsonObject_UpdateString(json,'appearance.y','top');
CkJsonObject_UpdateString(json,'appearance.x','left');
CkJsonObject_UpdateString(json,'appearance.fontScale','10.0');
CkJsonObject_UpdateString(json,'appearance.text[0]','Digitally signed by: cert_cn');
CkJsonObject_UpdateString(json,'appearance.text[1]','current_dt');
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'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 := CkCert_Create();
success := CkCert_LoadPfxFile(cert,'qa_data/pfx/myPdfSigningCert.pfx','secret');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

//  Tell the pdf object to use the certificate for signing.
success := CkPdf_SetSigningCert(pdf,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

success := CkPdf_SignPdf(pdf,json,'qa_output/hello_signed.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    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"
CkJsonObject_UpdateString(json,'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"
//  

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);
CkCert_Dispose(cert);